Physics Unit7: Linear Momentum - 51fly国际课程 (51fly.win)

1#

What is the SI unit o*h tsu 0s2,xnt:i 7nzcf momentum?

A. Nm

B. N/s

C. Ns

D. N/m

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a cannon fires a cannonball p f+se7y*u0tkyt ep5f.z.cx,, the cannon will recoil backward because the

A. energy of the cannonball and cannon is conserved.

B. momentum of the cannonball and cannon is conserved.

C. energy of the cannon is greater than the energy of the cannonball.

D. momentum of the cannon is greater than the energy of the cannonball.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A freight car moves along a frictionless level railroabz +bsht;zd1) 9sm5byd track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happyz)sb+h;mdb59 sz t 1bens to the velocity of the car?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A child falls sideways off a sled while sledding on frictionless ice.)jv 7w-hakm (t What happens to the velocity of the sl)-w jakv7(ht med?

A. It increases.

B. It remains the same.

C. It decreases.

D. cannot be determined from the information given

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball and a lump of putty have equal dx5rfy:(am(txwp(n8 mass. They are thrown with equal speed against a wall. The ball bounces back 5ma t8yxn(:df p(r(wxwith nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?

A. the ball

B. the putty

C. Both experience the same momentum change.

D. cannot be determined from the information given

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A sailboat of mass m1. lki/t6mplhx fkb48 is moving with a momentum p. How would you represent its kinetic energy in terms of thbt/fk 1ml4ki6l8hx p.ese two quantities?

A. $p^2/2m$

B. $\frac{1}{2} mp^2$

C. $mp$

D. $\frac{1}{2} mp$

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you pitch a baseball with twice the kinetic energy you gave it in theodeb b f,exu6vp5kp 9).koyy/ ny 3;(m previous pitch, the magnitude of its mk). xp ,6bpo/e3 9boy 5nfvdyuykm;(eomentum is

A. the same.

B. 1.41 times as much.

C. doubled.

D. 4 times as much.

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8#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law in terms of momentumaj41p9a)suzz,rxl x 3 .

该题自我估分: (必填) (满分:1.0分)

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9#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State the law of conservation of ;g ih95g 9jhpu*;n,j0gyr bho momentum.

该题自我估分: (必填) (满分:1.0分)

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The area under the curve on a Force versus time (F vs. t) grzmdk3 4pt(d3iy:h xj5oyc79naph represents

A. impulse.

B. momentum.

C. work.

D. kinetic energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is an accurate statementiz mgm56 d1 v; 85a8+*eaqecut ,ggizh?

A. The momentum of a projectile is constant.

B. The momentum of a moving object is constant.

C. If an object is acted on by a non-zero net external force, its momentum will not remain constant.

D. If the kinetic energy of an object is doubled, its momentum will also double.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small car meshes with a largeqyl+(5m*teyd u *xgy( truck in a head-on collision. Which of the following statemet um5 (yg( eldyy+x*q*nts concerning the magnitude of the average collision force is correct?

A. The truck experiences the greater average force.

B. The small car experiences the greater average force.

C. The small car and the truck experience the same average force.

D. It is impossible to tell since the masses and velocities are not given.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two equal mass balls (one red and the other blue) are dropped from the same6j4. r0 ibmezd height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjei0brdmjz .4 6ected to the greater magnitude of impulse during its collision with the floor?

A. It's impossible to tell since the time intervals and forces are unknown.

B. Both balls were subjected to the same magnitude impulse.

C. the blue ball

D. the red ball

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A Ping-Pong ball moving east at a speed of 4 m/s, coll /nb be35dvdx;ides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowlingdv;5e/dbb xn3 ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?

A. Neither; both experienced the same magnitude impulse.

B. the Ping-Pong ball

C. the bowling ball

D. It's impossible to tell since the velocities after the collision are unknown.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide anddhke/hj)3qi3 y0t,gt -y,/ ph.o 6*vb gaq bte bounce off each other. Linear momentum

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to thba( zkw 2dhg;)e right at 4.0 m/s. It collides head-on with a 6.0-kg object g(w)a; zb d2khmoving to the left at 2.0 m/s. Which statement is correct?

A. The total momentum both before and after the collision is 24 kgm/s.

B. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

C. The total momentum both before and after the collision is zero.

D. None of the above is true.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 100-kg football linebacker moving at 2.0 m*z g;vjzmu7npd/: e3e/s tackles head-on an 80-kg halfback run: nvgzmz3e u/jd 7;ep*ning
3.1 m/s. Neglecting the effects due to digging in of cleats,

A. the linebacker will drive the halfback backward.

B. the halfback will drive the linebacker backward.

C. neither player will drive the other backward.

D. this is a simple example of an elastic collision.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an elastic collision, if the momentum is l5;dcgt00-llvb np-t conserved, then which of the following statemepvt5n-dtl clb 0;-0glnts is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When is kinetic enera* *az*fqrz,yl*r)( 9pna/jm 4z yjcu *z7 kbqgy conserved?

A. in elastic collisions

B. in inelastic collisions

C. in any collision in which the objects do not stick together

D. in all collisions

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #5 ball and stops, while theja3ul5 0k wmzrxz8,t 3 #5 ball moves away with the same velocity as the cue ball had originally. The typexazw30l jmrtu k 5z83, of collision is

A. elastic.

B. inelastic.

C. completely inelastic.

D. any of the above, depending on the mass of the balls.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a light beach balltu ncqh 6a((++vk fo+i rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after tf(o u acn+6tkv iq(+h+he collision will be, approximately,

A. 0.

B. 3.0 m/s.

C. 6.0 m/s.

D. 12 m/s.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A golf ball traveling 3.0 m/s to the right colli. hlnrfg9m5udsh r h8;hs0.:o des in a head-on collision with a stationary bowling ball in a fricti u5hmfoh9lg;. d 0h:s.hn8rsron-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is

A. slightly less than 3.0 m/s.

B. slightly greater than 3.0 m/s.

C. equal to 3.0 m/s.

D. much less than 3.0 m/s.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A rubber ball with a speed of 5.0 m/s collides head-on elasti/o h,ifo pue.n4*gukdi 45ru)cally with an identical ball at rest. What is the speed of the initially stopped ball after the collisioih. eu r,n4/ g)douk5iof4up*n?

A. zero

B. 1.0 m/s

C. 2.5 m/s

D. 5.0 m/s

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with speed v colli fgbp26gv 3(l0umhs6mdes head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows dow g6 sml30p6(bf2 vmghun. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very light object moving gz3o k: 7v3-ffkp ilwcme t)m( 52j4qkwith speed v collides head-on with a very heavy object at rest, in mkcigojzmf3q23kw4 p e:7klv) ( ft5-a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collision is

A. slightly greater than v.

B. equal to v.

C. slightly less than v.

D. much less than v.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of e9k/bvw2so ej3qj m).kq7l m4lqual mass moving with a vvjoes4q)3 kbql2j9 7/mlwk.melocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?

A. zero

B. +3.0 m/s

C. -2.0 m/s

D. +5.0 m/s

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A very heavy object moving with velocity v colnk(+m5 d j-hws*uhrn ;lides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no frictudn h rks;-njw+5m h*(ion. The heavy object barely slows down. What is the speed of the light object after the collision?

A. nearly v

B. nearly 2v

C. nearly 3v

D. nearly infinite

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In an inelastic collision, if thllk, 4 4 m1vq-i cu9;tqx2vbsge momentum is conserved, then which of the following statesgxilkv-clq2 1b;,4 vq t9u 4mments is true about kinetic energy?

A. Kinetic energy is also conserved.

B. Kinetic energy is gained.

C. Kinetic energy is lost.

D. none of the above

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects collide and stick together. Kij9dn z:qt8h k4netic energy

A. is definitely conserved.

B. is definitely not conserved.

C. is conserved only if the collision is elastic.

D. is conserved only if the environment is frictionless.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves to the/hm val3rvkfn( 9 .z8hd9iy0l right at 4.0 m/s. It collides in a perfectly inelastic collisiy0vf n9d ah9mil3z8lvkrh ./ (on with a
6.1 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?

A. $72 \; J$

B. $36 \; J$

C. $24 \; J$

D. $0 \; J$

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object collides with a large object and sticks. Which object exped: 2h o r;gbgox 5poshn+)2io6i:+dlj riences the larger magnitude +i n;o sxdj h26)bho:g+:gpo5 i lo2rdof momentum change?

A. the large object

B. the small object

C. Both objects experience the same magnitude of momentum change.

D. cannot be determined from the information given

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a game of pool, the white cue ball hits the #9 ball and is de arm/ aokai;au;*k;c6,j s jk/flected at a $35^{\circ}$ angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?

A. $35^{\circ}$

B. $55^{\circ}$

C. $75^{\circ}$

D. $90^{\circ}$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Consider two unequal masses, M and m. Which of the following statesljq6*- np:c 4 fcikh0rpl08 iments is false?-f8jpc0prc:l6nkq0hsii l 4*

A. The center of mass lies on the line joining the centers of each mass.

B. The center of mass is closer to the larger mass.

C. It is possible for the center of mass to lie within one of the objects.

D. If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is a fs8-+2xbxe n,q:uxj jr b0.5tfcyux9 aalse statement?

A. For a uniform symmetric object, the center of mass is at the center of symmetry.

B. For an object on the surface of the Earth, the center of gravity and the center of mass are the same point.

C. The center of mass of an object must lie within the object.

D. The center of gravity of an object may be thought of as the "balance point."

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Tightrope walkers walk with a long flexible rod in ord t r(e)w o;a/sn:+ifbqg l71mmer to

A. increase their total weight.

B. allow both hands to hold onto something.

C. lower their center of mass.

D. move faster along the rope.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane, flying horizontally, releatw 5fn5 5xwfuwwo) t5 vw vdrv/0;kp6,k0u g/cses a bomb, which explodes before hitting the grg k/uw 5)u0ft ow5rwv56; 0 twxvp5vcw,fkdn/ound. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion

A. is zero.

B. moves horizontally.

C. moves vertically.

D. moves along a parabolic path.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two cars collide head-on o y krj/w3guk;em( ,c9-p*ojayn a level friction-free road. The collision was completely inj3,jr-gc;ow*ey9 /yka( ku pm elastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?

A. It was always zero.

B. It was never zero.

C. It was not zero, but ended up zero.

D. none of the above

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38#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State Newton's second law for a system of part5r /nf z,zud;aicles.

该题自我估分: (必填) (满分:1.0分)

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the momentum of a 2000-kg truck traveling at 35tm -n m*;gvjzyk3g76l m/s?

A. $57 \; kg \cdot m/s$

B. $3.5 \times 10^{4} \; kg \cdot m/s$

C. $7.0 \times 10^{4} \; kg \cdot m/s$

D. $7.0 \times 10^{5} \; kg \cdot m/s$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1200-kg ferryboat is moving south at 20 m/s. What is the magnitude of it gt-th3f x igiuos-929s momeni sxo fg9g- ut3t-2ih9tum?

A. $1.7 \times 10^{-3} \; kg \cdot m/s$

B. $6.0 \times 10^{2} \; kg \cdot m/s$

C. $2.4 \times 10^{3} \; kg \cdot m/s$

D. $2.4 \times 10^{4} \; kg \cdot m/s$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 0.10 kg is dropped from a 1:2fd.)yy4q 2;fh syq tkwyat rd)sh2 height of 12 m. Its momentum when it strikes they:taht)1y; dr w4)yfyhd2qf q22.kss ground is

A. 1.5 kgm/s.

B. 1.8 kgm/s.

C. 2.4 kgm/s.

D. 4.8 kgm/s.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two identical 1500-kg fmk-9qfm 5()gf bke j,cw 5k;hcars are moving perpendicular to each other. One moves with a speed of 25 m/s due north and the other moves at 1g w9 5b-( kf;ek,c5mfmh)jqkf5 m/s due east. What is the total momentum of the system?

A. $4.4 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

B. $4.4 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

C. $6.0 \times 10^{4} \; kg \cdot m/s$ at $31^{\circ}$ N of E

D. $6.0 \times 10^{4} \; kg \cdot m/s$ at $59^{\circ}$ N of E

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A handball of mass 0.10 kg, traveling horizontally at 30 m/s, strikg)fc*ey i -0ozes a wall and rebouif-oc 0ezy g*)nds at 24 m/s. What is the change in the momentum of the ball?

A. 0.60 kgm/s

B. 1.2 kgm/s

C. 5.4 kgm/s

D. 72 kgm/s

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.060-kg tennis ba1s;)m+*5 joqixmxbdkf e9ki.ll, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the iox*x;km.k 5dq1 ) 9+se mfibjchange in momentum of the ball?

A. 0.36 kgm/s

B. 0.72 kgm/s

C. 1.1 kgm/s

D. 1.8 kgm/s

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-kg pitching machine (excluding the baseball) is placed on atk y bv:9/dcj) frozen pond. The machine fires a 0.40-kg baseball with a speed of 35 m/s in the horizontal direction. What is :ybdvtck)9 j/the recoil speed of the pitching machine? (Assume negligible friction.)

A. 0.14 m/s

B. 0.28 m/s

C. 0.70 m/s

D. $4.4 \times 10^{3} \; m/s$

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 70-kg astronaut is space-walkinf;d;lecr-m (t 6/wxwi g outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule. At what speed txler6ww-(m d; c/if;does the astronaut move toward the capsule?

A. 0.40 m/s

B. 1.5 m/s

C. 3.5 m/s

D. 5.0 m/s

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small object with momentum 5.0 kgm/s approaches headefhk 3az7 (,tg-on a large object at rest. The small object bounces straight back with a momentum of magnitude 4.0 kgm/s. hgza t7f(3ke,What is the magnitude of the large object's momentum change?

A. 9.0 kgm/s

B. 5.0 kgm/s

C. 4.0 kgm/s

D. 1.0 kgm/s

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

You (50-kg mass) skate on )bvbaq-k zfo01 vv2f) ice at 4.0 m/s to greet your friend (40-kg mass), who is standing still, with open arms. As you co)0kfz v)fb- qavo2v 1bllide, while holding each other, with what speed do you both move off together?

A. zero

B. 2.2 m/s

C. 5.0 m/s

D. 23 m/s

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass 1000 kg movrjb6q g0ar) m ;n7yacgvol:/*es to the right along a level, straight road at a speed of 6.0 m/s. It collides directly with a stopped motorcycle of mass 200 kg. What is the total momentum aft*n0l: )6jc ;vbry/goqr7am gaer the collision?

A. zero

B. 6000 kgm/s to the right

C. 2000 kgm/s to the right

D. 10,000 kgm/s to the right

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1000-kg car traveling at 25 m/s runs into the rear o:q7iqg:4gj bsf a stopped car that has a mass of 1500 kg and they stick together. What i7 jqs:qgb :4igs the speed of the cars after the collision?

A. 5.0 m/s

B. 10 m/s

C. 15 m/s

D. 20 m/s

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad freight car, mass 15,000 kg, is allowed to coast along a leve7f2ipekpjnu*0jc,; ap ;28 gwpvw7d nl track at a speed of 2.0 m/s. It collideskacpup2n wj pd jp 2g0w8i7;*n7; ,efv and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars after coupling?

A. 0.46 m/s

B. 0.60 m/s

C. 1.2 m/s

D. 1.8 m/s

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A railroad car, of mass 200nda.i2 r- .jak kg, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be movingi-.r. d2 najka after this happens?

A. 2.8 m/s

B. 4.7 m/s

C. 7.4 m/s

D. 10 m/s

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 60-kg person walks a*hj +-/z8 5do guae*f 6rqzkxzwwl. ;on a 100-kg log at the rate of 0.80 m/s (with respect to the logr ea*-*lo azk65 wfw;hxgq+u/8zz.j d). With what speed does the log move, with respect to the shore?

A. 0.24 m/s

B. 0.30 m/s

C. 0.48 m/s

D. 0.60 m/s

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.0-N force acts for 3.0 s on an object. The force suddenly * 6;g8jchxx (fui1ynqn p:5c oincreases to 15 N and acts for one more second. What impulse was ihxf*pju61 n;x5ingyq: cc o8 (mparted by these forces to the object?

A. $12 \; N \cdot s$

B. $15 \; N \cdot s$

C. $19 \; N \cdot s$

D. $27 \; N \cdot s$

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55#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A constant 9.0-N net force acts (++ p;vtgodxml,yi j6for 2.0 s on a 6.0-kg object. What is the object'st, l(; io pj+m6v+yxgd change of velocity?

A. 3.0 m/s

B. 9.0 m/s

C. 27 m/s

D. 110 m/s

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2000-kg car, traveli q:uzswat8kz4idq +5n:*9zpzng to the right at 30 m/s, collides with a brick wall and comes to rest in 0.20 s. What is the average force the car exer u:+t5:*84kqa znq z9wzzsdpits on the wall?

A. 12,000 N to the right

B. 300,000 N to the right

C. 60,000 N to the right

D. none of the above

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg softball is pitched tor 3c*zg0szas ) tf:;t j 1v.rv*vg8sga you at 20 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the b3 v)1gv ;0at**z8arstsvc . g:gz frsjall for 0.10 s, what is the magnitude of the average force the bat exerted?

A. zero

B. $40 \; N$

C. $400 \; N$

D. $800 \; N$

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg ball is dropped onto a table top. The speeds of thek1*5.+ff 5bfbnn2 mubgzkg b-* nff j* ball right before and right after hitting the table top are 5.0 m/s and 4.0 m/s, respectively. If the collision between the ball and the table top lasts 0.15 s, wha .5jmu1n5gfbn + nzfbbfffkk*g* b-2*t is the magnitude of the average force exerted on the ball by the table top?

A. $0.67 \; N$

B. $1.3 \; N$

C. $3.0 \; N$

D. $6.0 \; N$

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A machine gun, of mass kfy;4g rj8ytdzq*b4 us5so+ 435.0 kg, fires 50.0-gram bullets, with a muzzle velocity of 750 m/s, at the rate of 300 rounds per minute. What is the average force exerted on the s; guoj ktfb rq4s4d*8y5yz+4 machine gun mount?

A. $94.0 \; N$

B. $188 \; N$

C. $219 \; N$

D. $438 \; N$

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A fire hose is turned i)4bcu2.buf von the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg per second, what is the minimum velocity of the stream needed, as4 ).b2bcu ivfusuming the water doesn't bounce back?

A. 15 m/s

B. 20 m/s

C. 25 m/s

D. 30 m/s

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Water runs out of a horizontal drainpipe at the rate of 120 kg per mi9*ku(u - ov7/o iw 2hlie8vct7db9cf lnute. It falls 3.20 m to the groun 8ftud2-vil7wc9l 9* kbho ei/7uco(vd. Assuming the water doesn't splash up, what average force does it exert on the ground?

A. $6.20 \; N$

B. $12.0 \; N$

C. $15.8 \; N$

D. $19.6 \; N$

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A toy rocket, of mass 0.12 kg, achieves a velocity w8qb+3rqxx)nqjx8hp70i v*, fm1l q qof 40 m/s after 3.0 s, when fired straight up. What average thrus8 irwbqq7q3x81jqlnmx+ )x vf*p qh0 ,t force does the rocket engine exert?

A. $1.2 \; N$

B. $1.6 \; N$

C. $2.8 \; N$

D. $4.4 \; N$

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two astronauts, of masses 60 kg mxanq0-j 7m50gp:nry d s)9yb and 80 kg, are initially at rest in outer space. They push each other apagd yb)0s j57m x9nm:-0yrnapqrt. What is their separation after the lighter astronaut has moved 12 m?

A. $15 \; m$

B. $18 \; m$

C. $21 \; m$

D. $24 \; m$

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg object moves tod9;gjdy ; ;qsujwcc3( the right with a speed of 2.0 m/s. It collides in a perfectly elastic collision with a 6.0-kg object mo;yj; 9qsc3u j;cgd dw(ving to the left at 1.0 m/s. What is the total kinetic energy after the collision?

A. $9.0 \; J$

B. $6.0 \; J$

C. $3.0 \; J$

D. $0 \; J$

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 0.10-kg object with a velocity of 0.20 m/s in the +x direction makes a head-o/ a(3 p.jyzvwun elastic collision with a 0.15 kg object initially at rest. What is a(jvyzp3/w.uthe final velocity of the 0.10-kg object after collision?

A. -0.16 m/s

B. +0.16 m/s

C. -0.040 m/s

D. +0.040 m/s

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 10.0-g bullet moving at 300 m/s is fired into a 1lfbdg/s,e - fe)lq;vjc8d 7h:.00-kg block at rest. The bullet emerges (the bullet does not get embedded in the block) with half of its original speed. What is the velocity of the block right s-edled),qbvg8hfl;c j f 7:/after the collision?

A. 1.50 m/s

B. 2.97 m/s

C. 3.00 m/s

D. 273 m/s

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton, of mass m, at rest, isp iz8z/ g e6mhk8r-k8q struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the k/k8rzg qm-8ipz8 eh6 alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.)

A. zero

B. 2v/3

C. 3v/5

D. 5v/3

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 50-gram ball movinpx7c ;rp/kt*v). uwabg +10 m/s collides head-on with a stationary ball of mass 100 g. The collision is elastic. What is the speed of each ball immediately after trku pwp t)v/;cx*a.7bhe collision?

A. -3.3 m/s and +6.7 m/s

B. +3.3 m/s and -6.7 m/s

C. -6.7 m/s and +3.3 m/s

D. +6.7 m/s and -3.3 m/s

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69#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A ball of mass 400 g moving l2f/l.6cp;i (hydn; 2tc cdj ttoward the east with a speed of 3.70 m/s collides head-on with a 200 g ball sitting at rest. The collision is perfectlyclhytn/ j2 .tcfdd;2p(l 6i; c elastic.
(a) Determine the velocity of the first ball after the collision.
(b) Determine the velocity of the second ball after the collision.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on wi w tvva7bms0g+54.gscth a 3.0 kg mass at rest. If the collision is perfectly inelast7v0s tb 4smag+cv.g5w ic, what is the speed of the masses after the collision?

A. 10 m/s

B. 2.5 m/s

C. 2.0 m/s

D. 0, since the collision is inelastic

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 2.0-kg mass moving to the east at a speed*hipjt(lw(o/ 9ef n )l of 4.0 m/s collides head-on in a perfectly inelastic colj po (fi(l9/)entw*lh lision with a stationary 2.0-kg mass. How much kinetic energy is lost during this collision?

A. $16 \; J$

B. $4.0 \; J$

C. $8.0 \; J$

D. zero

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A car of mass m, traveling with a velocity v, strikes a parked stat18j,xkcxqq 5 9q bj.llion wagon, who's mass is 2m. The bumpers lock together in this head-on inelasticqqk, 8x1l59q.j bcjlx collision. What fraction of the initial kinetic energy is lost in this collision?

A. 1/2

B. 1/3

C. 1/4

D. 2/3

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73#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

A 15-g bullet traveling 213 m/s in a vertical directi4v:w ggee(0qk( /xjz j,o2rznon buries itself in a 2.4-kg block of wood a rest directly above it. As a result, thrq: xze,42wz j0jv(/ kn( oegge bullet/block combination moves vertically upward.
(a) Determine the velocity of the bullet/block combination at the point of impact.
(b) Determine the maximum height reached by the bullet/block combination.
(c) Is kinetic energy conserved in this collision?

该题自我估分: (必填) (满分:1.0分)

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with abte 1dr,xy,amypzml6r3et+ . 4 j6 *yj 3000-kg car traveling at 60.0 km/h south.4*z tldy tb6 mjr,a 31yeyjrm6p+,ex. The two cars stick together after the collision. (See Fig. 7-1.) What is the speed of the cars after collision?

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A. 8.33 m/s

B. 13.9 m/s

C. 17.4 m/s

D. 21.7 m/s

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1500-kg car traveling at 90.0 km/h east collides with a 3000-8a u/ (ovbs1*m4pxqwzmh/ k p6kg car traveling at 60.0 km/h south. The two cars stick together after the collision. (See Fig. 7-1.) What is the direct wx/q pmmkhu8b(av/ *s6p4o z1ion of motion of the cars after collision?

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A. $36.9^{\circ}$ S of E

B. $36.9^{\circ}$ E of S

C. $53.1^{\circ}$ S of E

D. $53.1^{\circ}$ E of S

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two objects move on a level frictionless surface. Object A moves jeci0mqt /t(3iyd* )zeast with a momentum of 24 kgm/s. Object B moves north with momentum 10 kgm/s. They make a perfectly inelastic collision. What is the magn*(j /d0cm)yeiz qt3i titude of their combined momentum after the collision?

A. 14 kgm/s

B. 26 kgm/s

C. 34 kgm/s

D. cannot be determined without knowing masses and velocities

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A small bomb, of mass 1 ynyaygfz 45l/ 810ap3:s3sxunl+fvq 0 kg, is moving toward the North with a velocity of 4.0 m/s. It explodes into three fragments: a 5.0-kg fragment moving west with a speed of 8.0 m/s; a 4.0-kg fragment moving east with a speed of p343v:ay8snfuz g 5ynfalx+y0q/1 l s10 m/s; and a third fragment with a mass of 1.0 kg. What is the velocity of the third fragment? (Neglect air friction.)

A. zero

B. 40 m/s north

C. 40 m/s south

D. none of the above

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 4.00-kg mass sits at the origin, and a 10.0-kg mass sits at x = + 216z4uf ptgip z q-q/+6m.0 m. Wheremfq6qpiz6-u4z pt /g+ is the center of mass on the x-axis?

A. +7.00 m

B. +10.5 m

C. +14.0 m

D. +15.0 m

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The center of mass of a two-pac 0fjiwk/h z;jcplft,)d e8lo* c 4(h;rticle system is at the origin. One particle is located*e4z)fct; i kjc (0cl,lphw;oh d/jf 8 at (3.0 m, 0) and has a mass of 2.0 kg. What is the location of the second mass of 3.0 kg?

A. (-3.0 m, 0)

B. (-2.0 m, 0)

C. (2.0 m, 0)

D. (3.0 m, 0)

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses are positioned as follows: 2.0 kg at (0, 0).p r4vpik+2;gfc1syr2b 4yeo aw)s 3 q, 2.0 kg at (2.0, 0), and 4.0 kg at (2.0, 1.0). Determine the coordinates of the center of masiy4kc q1gssf 2 ;pra3r+4 bevy2wop.) s.

A. (0.50, 1.5)

B. (1.5, 0.50)

C. (2.5, 1.5)

D. (2.5, 0.50)

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0, 0),-3h 8bf7k aks* fbugc/i bg(4q (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is *i73k c/a f gfkhb8s4(qbu-bg the location of the center of mass of the system?

A. (1.3 m, 0.67 m)

B. (1.3 m, -0.67 m)

C. (-1.3 m, 0.67 m)

D. (-1.3 m, -0.67 m)

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 3.0-kg mass is positioned at (0, np(u ahz5as7abx o)sb4 (850axbns+ m 8.0), and a 1.0-kg mass is positioned at (12, 0). What are thzbbbm)au7s+x0x ns(o ( a855anaph4s e coordinates of a 4.0-kg mass which will result in the center of mass of the system of three masses being located at the origin, (0, 0)?

A. (-3.0, -6.0)

B. (-12, -8.0)

C. (3.0, 6.0)

D. (-6.0, -3.0)

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Use Table 7-1 to calculate the position of the CM of a whole leg including the f poo0.;sdct)e(r o n7ooot when the leg 0pcors o;()dn7eo.t ois stretched straight out. Assume the person is 1.60 m tall.

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A. 0.20 m above the bottom of the foot

B. 0.32 m above the bottom of the foot

C. 0.51 m above the bottom of the foot

D. 0.54 m above the bottom of the foot

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