pressed spring of negligible mass between them. When the spring is released, the
ID: 2037530 • Letter: P
Question
pressed spring of negligible mass between them. When the spring is released, the energy of the spring is shared between the two masses in such a way that A) M gets 3/5 of the energy B) M gets 1/6 of the energy C) M gets 1/5 of the energy D) M gets 4/5 of the energy E) None of these will occur. 13) The condition necessary for the Conservation of Linear Momentum in a given system is that A) B) C) energy is conserved. one body is at rest. the net external force is zero. D) E) internal forces equal external forces. None of these is correct. 14) A superball of mass m is dropped vertically from a height, h. If the impact time with the floor is At, what is the average force on the ball? (Assume that the superball bounces back to the same height.) A) 2m2gh D) Ar E) none of the above c) m2gh 15) Calculate the impulse by the force, as shown in the figure below. 2 2 4 t, ms A) 1.0 mNs B) 2.0 mNs C) 4.0 mNs D) 10.0 mN-s E) 40.0 mNs 16) An object of mass M, is moving with a speed von a straight, level, frictionless track when it collides with another mass M, that is at rest on the track. After the collision, M, and M; stick together and move with a speed ofExplanation / Answer
13.
Moment conservation means a closed system is not affected by external forces, Or in other words net external forces are zero.
Correct option is E.
14.
Avg force is given by:
F = dP/dt
F = m*dV/dt
when ball is dropped, his final speed will be just before striking the ground
V1f^2 = Vi^2 + 2*g*h
Vi = 0
V1f = sqrt (2*g*h)
when ball bounces back to same height, it's initial will be
V2f = -sqrt (2*g*h)
F = m*(sqrt (2gh) - (-sqrt (2gh)))/dt
F = 2*m*sqrt (2gh)/dt
Correct option is A
15.
Impulse is given by:
J = F*dt
J = 2 N*(4 - 2)*10^-3 sec = 4*10^-3 N-s
J = 4.0 mN-s
Correct option is C.
16.
For inelastic collision, using momentum conservation:
Pi = Pf
M1*v + M2*0 = (M1 + M2)*V
V = M1*v/(M1 + M2)
Correct option is D.
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