Centre of mass system - 无忧得胜-网上国际课程 (5edu.win)

1#

06.10: A firecracker explodes while in flight bb3(c0qjw,,vh s yk8aalong a parabolic path and fragments from it traveling all directions. A va8kb cwy, 3,q(hb0sjfter the explosion, the center of mass of the firecracker

A. falls directly vertically downward.

B. ceases to exist.

C. lands equidistance from all fragments

D. has no forces acting on it.

E. continues to move along a parabolic path.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.20: A large wedge rests on a horiz.oprc60 c-ytwontal frictionless surface, as shown. A block starts fromco r60-yptc.w rest and slides down the inclined surface of the wedge, which is rough. During the motion of the block, the center of mass of the block and wedge system

A. does not move.

B. moves vertically with increasing speed.

C. moves horizontally with constant speed.

D. moves horizontally with increasing speed.

E. moves both horizontally and vertically.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

10.34: A 4.0 kg object in deep space moves at a constant0q4, log+*xmtr/ elyon,bw 7l velocity of 10 m/s along the +x axis. The object suddenly explodes into 2 equal mass pieces. Immediately after the explosion, one piece is now moving directly along the –y axis with a speed of 8.0m/s. What was the size of the impulse (in proper MKS units) provided to this piem+w,l /og0bytl ,xl oqn7r*e4ce now moving along the –y axis from the explosion?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

16.26: A 10.0 kg mas *kzi+e;yhz r-fny1cxkoabl(v .jyz8.81 6nis moves to the right at 8.00 m/s. A 5.0 kg mass moves to the left at 7.00 m/s. With what speed does the center of mass of this two-mass system fiy8xr(8ybky*ni.n e1k;jc-lz1oh +z 6 a.vzmove?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.34: A 9.20 m long uniform plank rests on a frict0trx;ks w;-h9eu(x -7lhsz ksionless ice pond. A 52 kg box rests on the plank’s left endt(w e hlzr;s 7hux9xk0-k;ss- while a 71 kg person stands at the plank’s right end. After the person walks to the left on the plank and stands at the same location as the box, the plank has slid 3.84 m to the right relative to the pond’s shore. Which one of the following choices best represents the mass of the plank?

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