A9.6-g bullet is fired into a stationary block of wood having mass m = 4.95 kg. the bullet imbeds into the block. the speed of the bullet-plus-wood combination immediately after the collision is 0.591 m/s. what was the original speed of the bullet? (express your answer with four significant figures.)

Original speed of the bullet = 305.21 m/s

Explanation:

Here momentum is conserved.

Mass of bullet = 9.6 g = 0.0096 kg

Mass of wood = 4.95 kg

Let velocity of bullet be v.

Initial momentum = 0.0096 v

Final mass = 0.0096 + 4.95 = 4.9596 kg

Final velocity = 0.591 m/s

Final momentum = 4.9596 x 0.591 = 2.93 kgm/s

Equating both momentum

           0.0096 v = 2.93

                      v = 305.21 m/s

Original speed of the bullet = 305.21 m/s

learn it on the intertant so you can solve

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000