What is recoil speed of the hydrogen atom after absoribing

Question:

1) A 15 g bullet is shot into a 5085 g wooden block standing on a frictionless surface. The block, with the bullet in it, acquires a velocity of 1 m/s. Calculate the velocity of the bullet before striking the block.?2)What is the force on the head of a nail that is struck by a 1.5 kg hammer moving at 7 m/s. (The hammer is brought to rest in 0.001 s.)?

A) 10.5 N
B) 105 N
C) 1050 N
D) 10500 N
E) 105000 N
F) I haven't a clue.

3) A blue-green photon (484nm) is absorbed by a free hydrogen atom, initially at rest.

What is the recoil speed of the hydrogen atom after absoribing the photon?

4) A heat engine with a thermal efficiency of 25 % does 100j of work per cycle.

Part A

How much heat is extracted from the hot reservoir per cycle?

Part B

How much heat is exhausted to the cold reservoir per cycle?

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##### Reference No:- TGS02054915

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