Print Name Test 3 Conceptual Questions: 5x8-40 1. The linear momentum of an obje

Question

Print Name Test 3 Conceptual Questions: 5x8-40 1. The linear momentum of an object at a given instant is in the same direction as its A) displacement B) velocity C) acceleration D) force E) Momentum is a scalar and does not have a direction 2. Two bodies, A and B, have equal kinetic energies. The mass of A is nine times that of B. The ratio of the momentum of A to that of B is: A) 1:9 B) 1:3 D) 3:1 E) 9:1 3. A pulley with a radius of 3.0 cm and a rotational inertia of 4.5 10-3 kg·m2 is suspended from the ceiling. A rope passes over it with a 2.0-kg block attached to one end and a 4.0-kg block attached to the other. The rope does not slip on the pulley. When the velocity of the heavier block is 2.0 m/s the total kinetic energy of the pulley and blocks is: A) 2.0J B) 12 J C) 14J D) 22J E) 28 J 4. A fan rotating with an initial angular velocity of 1000 rev/min is switched off. In 2 seconds, the angular velocity decreases to 200 rev/min. Assuming the angular acceleration is constant, how many revolutions does the blade undergo during this time? A) 10 B) 20 C) 100 D) 125 E) 1200 5. A spinning skater draws in her outstretched arms thereby reducing her moment of inertia by a factor of2. Determine the ratio of her final kinetic energy to her initial kinetic energy. A) 0.5 B) 1 C) 2 D) 4 E) 16 6. A 1500-kg satellite orbits a planet in a circular orbit of radius 62 06 m. What is the angular momentum of the satellite in its orbit around the planet if the satellite completes one orbit every 1.5 x 10* s? A) 3.9× 106 kg·m2/s B) 1.4 x 10 kg m/s C) 6.2 x 10* kg m/s D) 8.1× 1011 kg . /s E) 2.4 × 1013 kg·m 2/s

Explanation / Answer

let,

radius, r=6.2*10^6 m

mass, m=1500 kg

time period T=1.5*10^4 sec

angular momentum, L=m*v*r

=m*(2pi*r/T)*r

=1500*(2pi*6.2*10^6/(1.5*10^4)*(6.2*10^6)

=2.4*10^13 kg*m^2/sec

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