Two tanks of gas, one of hydrogen, H2, and one of helium, He, contain equal numbers of moles of gas. The gram-molecular mass of He is twice that of H2. Both tanks of gas are at the same temperature, 293 K. Which statement(s) below is(are) correct when we ignore vibrational motion?
A. The total internal energy of the hydrogen is the same as that of the helium.
B. The total internal energy of the hydrogen is 1.4 times that of the helium.
C. The total internal energy of the helium is 1.4 times that of the hydrogen.
D. The total internal energy of the hydrogen is 1.67 times that of the helium.
E. The total internal energy of the helium is 1.67 times that of the hydrogen.
Answer: D
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An oscillating system has a small amount of damping. It is observed that in the course of 20.0 s the amplitude has decreased from A to A/2. What additional time is required for the amplitude to decrease to A/4?
What will be an ideal response?
Angie says that an object is in equilibrium if the net torques about the center of mass is zero. Robbie says that an object is in equilibrium if the sum of external forces is zero. Which one, if either, is correct?
a. Both are correct: an object is in equilibrium if either condition holds. b. Neither is correct: both conditions must hold simultaneously. c. Neither is correct: the net external force and the net external torque about any axis must be zero. d. Neither is correct: an object is in equilibrium only if its velocity is zero in all coordinate systems. e. Both are correct: if the sum of the external forces is zero, the net torque about any axis is automatically zero, and vice versa.
The annealing point for the soda-lime glass in Figure 9.3 is approximately _________K
Fill in the blank(s) with the appropriate word(s).
Suppose that two objects collide. Which of the following things is not the same both before and after the collision?
A) the total momentum of the objects B) the total temperature of the objects C) the total energy of the objects D) the total angular momentum of the objects