When considering human metabolism in terms of the 1st law of thermodynamics, which of the following represents the metabolic rate?
a. ?U / ?t
b. ?Q / ?t
c. W / ?t
d. ?W / ?t
a
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Two stars that have the same absolute magnitude also have the same luminosity.
Answer the following statement true (T) or false (F)
An ideal gas is allowed to expand slowly at constant temperature to twice its original volume. During the expansion, the gas absorbs 200 kJ of heat
(a) What is the change in the internal (thermal) energy of the gas during the expansion? (b) How much work does the gas do during the expansion? What will be an ideal response?
General Questions: In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.
A. True B. False C. It depends on whether the collision is a head-on collision or a rear-end collision.
Which of the following best describes the orbits of stars in the halo?
A) Halo stars have orbits confined to a relatively thin plane. B) Halo stars have elliptical orbits, with random orientations. C) Halo stars have elliptical orbits, but all orbiting in the same direction. D) Some halo stars orbit around the galactic center but others never pass through the plane of the galactic disk. E) Halo stars orbit the centers of their globular clusters, but do not orbit the center of the galaxy.