A bullet of mass m1 =.050kg strikes and passes through a wooden block whose mass

Question

A bullet of mass m1 =.050kg strikes and passes through a wooden block whose mass is m2 = 4.0kg. The block is suspended vertically by a 1m long string. The bullet emerges with a speed of 60 m/s, and the block swings through a maximum angle of 32.46 degrees. a) Is kinetic energy conserved in the impact? b) Is momentum conserved in the impact? c) How high is the block at the highest point? d) What is the velocity of the block just after the bullet passed through it? e) What was the initial velocity of the bullet?

Explanation / Answer

a)

not conserved

b)

conserved

c)

costheta = (L-h)/L

cos32.46 = (1-h)/1

h = 0.16 m

(d)

kinetic energy at the lowest point =potential energy at the highest point

0.5*m2*v2^2 = m2*g*h

v2 = sqrt(2*g*h)

v2 = sqrt(2*9.8*0.16)

v2 = 1.77 m/s <<<<<----------answer

++++++

(e)

momentum before collision = momentum after collision

m1*v1 = m2*v2 + m1*v1'

0.05*v1 = (4*1.77)+(0.05*60)

v1 = 201.6 m/s <<<_---------answeer

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