Three objects are moving along a straight line as shown in the figure. Taking th

Question

Three objects are moving along a straight line as shown in the figure. Taking the positive direction to be the right, what is the total momentum of this system? +106 kg - m/s -106 kg - m/s +14.0 kg - m/s -14.0 kg - m/s 0.00 kg - m/s The figure shown a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If L_F is the latent heat of fusion of this substance and L_V is its latent heat of vaporization, what is the value of the ratio L_V/L_F? 5.0 4.5 7.2 1.5 3.5 By what primary heat transfer mechanism does the sun warms the earth? convection conduction radiation All of the above processes are equally important in combination. When a gas expands adiabatically, the internal (thermal) energy of the gas remains constant the temperature of the gas remains constant it does no work. work is done on the gas. no heat energy is lost or gained. A person tries to heat up her bath water by adding 5.0 L of water at 80degreeC to 60 L of water at 30degreeC. What is the final temperature of the bath water? Assume no heat loss to the outside. less than 36degreeC 36degreeC 38ddegreeC 40degreeC more than 40degreeC

Explanation / Answer

Question 56:

Momentum of the first object, m1u1 = 8.0 kg * 5.0 m/s = 40.0 kg.m/s

momentum of the second object, m2u2 = 15.0 kg *[-4.0 m/s] = - 60.0 kg.m/s

momentum of the third object, m3u3 = 3.0 kg * 2.0 m/s = 6.0 kg.m/s

Total momentum of the system, p = 40.0 - 60.0 + 6.0 = -14.0 kg.m/s

Hence, Option 'D' is the Correct choice.

Question 58:

The primary heat transfer mechanism the SUn warms the Earth is Radiation.

Hence, Option 'C' is the Correct Choice.

Question 59:

When a gas expands adiabatically, no heat energy is lost or gained, dQ = 0.

Hence, Option 'E' is the Correct Choice.

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