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

1#

06.10: A firecracker explodes while in fli,+fovwe9qjx it 87 kme/(p wl4ght along a parabolic path and fragments from it traveling all directions. After the explosion, the ceniw(w po/f4+ x97,ljek t8qemvter 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 horizontal frictionless surface, d77) fdenv co 1:qs9aqdbjvp( hw4m*- as shown. A block starts from rest and slides down the inafnveq 4 -ddb* j7h7m)19: cvpw sodq(clined 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 mh(y k 7 (ngmxnyp20f-oy*bih2oves at a constant velocity of 10 m/s along the +x axis. The object suddenly explodes into 2 equal mass pieces. Immediately after the explgypmi*n 2 fhy( y 0(nkb-ho27xosion, 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 piece 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 mass moves to the right at 8.00 m/s. A 5.0 k8e kaq+qdo-5ew4jt1eu v.w m5 g mass moves to the left at 7.00 m/s. With what speed does the centeeu. +ad-4v15jw5q to8 mqekew r of mass of this two-mass system move?

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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 anb0 1lc hqu mk1rk),zx,-h *up s 2iimw5t-*ka frictionless ice pond. A 52 kg box rests on the plank’s left end while a 71 kg person stands at the plank’s right end. After the person walks to the leftskk-2iwmh a l,pqz0b*tc) h k,m*- 15ux1nui r 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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