3. Two objects, A and B, have a mass ratio of mA : mB = 2 : 1. If both objects have the same kinetic energy, what is the ratio of the magnitudes of their momenta, pA : pB?(A) 1 : 1(B) :1(C) 2 : 1(D) 4 : 1

9. According to the First Law of Thermodynamics, if a closed system absorbs heat Q from its surroundings and does work W on its surroundings, what is the change in the internal energy of the system, ΔU? (Sign convention: heat absorbed is positive, work done by the system is positive) (A) ΔU = Q + W (B) ΔU = Q - W (C) ΔU = W - Q (D) ΔU = -Q - W

3. Two objects, A and B, have a mass ratio of m_A : m_B= 2 : 1. If both objects have the same kinetic energy, what is the ratio of the magnitudes of their momenta, p_A : p_B?
(A) 1 : 1
(B) :1
(C) 2 : 1
(D) 4 : 1

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