(c) 100 (d) 10 rn 5. A student throws a 100 g snowball at 10 m/s at the side of
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Question
(c) 100 (d) 10 rn 5. A student throws a 100 g snowball at 10 m/s at the side of the schoolhouse, where it hits and sticks. What is the magnitude of the average force on the wall if the duration of the collision is 0.1 s ? (a) 1N (b) 100N (c) 1 (d) .1N 209- 6. When a figure scater spins in one position her moment of itertia is 11 10kg m2. When she streches her leg up while spinning her moment of inertia becomes 12 5kg m2. By what factor does her angular velocity change? (a) Does not change (b) Increase by 2 (c) Increase by 4 Decrease by 2 7. A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70 kg , and the mass of the bullet is 10 g. The speed of the man afterwards is 1 m/s. What is the speed of bullet?Explanation / Answer
5.
Force is given by:
F = dP/dt
F = m*dV/dt
F = 100*10^-3*(10 - 0)/0.1
F = 10 N
Correct option is C.
6.
Using angular momentum conservation
Li = Lf
I1*w1 = I2*w2
w2 = (I1/I2)*w1
w2 = (10/5)*w1
w2 = 2*w1
Angular velocity increase by a factor of 2
Correct option is B.
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