Is the collision elastic or inelastic? a inelastic b)elastic How much kinetic en

Question

Is the collision elastic or inelastic? a inelastic b)elastic How much kinetic energy (in J) is lost during the collision? a) 12.5 b) 5 c)10 d) 15 A block of 10 kg rests on the (horizontal) floor. The coefficient of kinetic friction between the block and the floor is 0.1. You push horizontally on the block with a force F = 30 N. What is the work done on the block by the force F after the block has moved a distance d = 2 m (in the same direction of the force on the floor). a) 30 b) 40 c)50 d) 60 What is the increase of the kinetic energy of the box after it has traveled a distance d = 2m? a) 30 b) 40 c)50 d) 60 Suppose F is still 30 N but is now angled at 30 degree downward. Is the done by F in moving the block through a distance d = 2 m (on the floor) smaller or larger than the work done when F is horizontal? a) smaller b)larger c)the same A 7.2 kg bowling ball is suspended from a 3 m long wire to pendulum. The pendulum is pulled to one side, to a height h above lowest point, and released from rest. What is the speed v of the when it reaches its lowest point?

Explanation / Answer

14,15 dont have data on the page

16) work done= F.d

= 30*2

= 60 N. option D

17) Friction Fr = umg = 0.1*10*10 = 10 N

change in KE = work done by all forces

= F*d -Fr*d

= 30*2-10*2

= 40 J. option b

18) Work done = Fd cos 30 degree = 60* cos 30 degree

so smaller

option A

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