A 2 solar mass main sequence star is at the same distance as a 0.2 solar mass main sequence star. Which star appears brighter?
A. It depends on the phase of the Moon
B. The 0.2 solar mass main sequence star
C. We cannot tell with the information given
D. The stars are approximately the same brightness
E. The 2 solar mass main sequence star
Ans: E. The 2 solar mass main sequence star
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When a rigid body rotates about a fixed axis, all the points in the body have the same
A) tangential speed. B) angular acceleration. C) tangential acceleration. D) linear displacement. E) centripetal acceleration.
A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel. c. the downward force of gravity is less than the downward momentum of the fuel. d. of none of the above reasons.
Which of the following stars has a spectrum that peaks at the shortest wavelength?
A) a blue star B) a red star C) a yellow star
For the polymer in Example problem 9.4, calculate the total strain after 30 days if the material is subject to a creep test with a constant stress of 3×107 Pa. Assume that this material behaves as a Maxwell solid and the viscous part of this material behaves as a Newtonian fluid.
What will be an ideal response?