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  31. Two blocks of masses 20 kg and 8.0 kg

Question :   31. Two blocks of masses 20 kg and 8.0 kg : 2102104

 

31. Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.5 m/s2, what is the tension in the second string attached to the 8-kg mass?

A. 14 N

B. 6.0 N

C. 10 N

D. 4.0 N

32. A 10-kg mass and a 2.0-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s2, what is the acceleration of the system when released?

A. 2.5 m/s2

B. 6.5 m/s2

C. 7.8 m/s2

D. 9.8 m/s2

33. A 15-kg block rests on a level frictionless surface and is attached by a light string to a 5.0-kg hanging mass where the string passes over a massless frictionless pulley. If g = 9.8 m/s2, what is the tension in the connecting string?

A. 65 N

B. 17 N

C. 49 N

D. 37 N

34. An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2)

A. 13 900 N

B. 23 100 N

C. 20 000 N

D. 26 100 N

35. As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:

A. bigger than his weight.

B. equal in magnitude and opposite in direction to his weight.

C. less than his weight.

D. zero.

 

Solution
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Physics 1 Year Ago 86 Views
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