A 25-N steel ball is suspended by a light rope from the ceiling and the system i

Question

A 25-N steel ball is suspended by a light rope from the ceiling and the system is not moving. The tension in the rope is 25 N 25gN zero can't decide without acceleration information Work is done when a net force is applied to an object over a certain distance True false A 2kg block is lifted vertically 0.5 m by a construction worker How much work was done by the construction worker? 1 J 10 J 0.1J zero If a person does 50 J of work In mowing a 30kg box over a 10m distance on a horizontal surface, what Is the minimum force required? 0.2 N 1.66N 3N 5N A certain motor is able to perform 6000 J of work over the course of 2 minutes. What power is developed by the motor during this time? 50 W 3000W 12000W 3000J 50J A 6.0-kg block Is released from rest 80m above the ground. When it has fallen 50 meters It's potential energy is approximately: 4800 J 3500 J 2940J 1764J 600J A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground Determine the kinetic energy possessed by the skydiver. 3.9 Times 10^3 J 1.5 Times 10^5 J 2.4 Times 10^4 J 2.7 Times 10^4 J A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. Determine the potential energy possessed by the skydiver 6.7 Times 10^5 J 1.5 Times 10^5 J 4.2 Times 10^6 J 8.1 Times 10^5 J What is the mass of an object that moves 10 meters in 2 seconds, and has a momentum of 10 Ns? 1 kg 2 kg 5 kg 10 kg The collision of two pool balls is approximately what kind of collision? Inelastic Elastic Completely inelastic Depends on the nature of the collision A particle of 1 kg mass moving at a velocity of 50 m/s hits a particle of 1 kg mass al rest in an elastic collision. What is the final velocity of the second particle? 0 25 m/s 100 m/s 50 m/s You tie a rock to a string and whirl it in a horizontal circle. The string breaks. In the absence of gravity, the rock... Travels in a circle Flies in a straight line vertically up into the air Travels in a straight line horizontally away from you Explodes

Explanation / Answer

22. ball is in equilibrium,

T -mg = 0

T = mg = 25 B ....Ans(A)

23. True.

24. W = m g h = 2 x 9.8 x 0.5 = 9.8 J Or 10 J

ans(b)

25. Work done = F.d

50 = F(10)

F = 5 N

Ans(d)

26. P = work done / time

P = (6000 J) / (2 x 60 sec) = 50 Watt

ans(A)

27. P = m g h = 6 x 9.81 x (80 - 50) = 1764 J

Ans(d)

28. KE = m v^2 / 2 = 78 x 62^2 / 2 = 1.5 x 10^5 J

Ans(b)

29. PE = 78 x 9.81 x 870 = 6.7 x 10^5 J

Ans(a)

30. v = 10/2= 5 m/s

momentum = m v

10 = m (5)

m = 2 kg

32. when mass is same then velocity interchanges.

Ans (d)

33. (C)

rock will move in the direction of velocity it has at the time string breaks.

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