Two cars that have the same mass are moving around a circular track at the same constant speed. The track is perfectly level. If car 1 is at the inner edge of the track and car 2 is at the outer edge, then
A. the frictional force on car 1 is greater than the frictional force on car 2.
B. the frictional force on car 1 is less than the frictional force on car 2.
C. the frictional force on both cars is zero.
D. the frictional forces on both cars are equal and greater than zero.
Answer: A
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A space probe leaves the solar system to explore interstellar space. Once it is far from any stars, when must it fire its rocket engines?
A. all the time, in order to keep moving B. only when it wants to speed up C. only when it wants to slow down D. only when it wants to turn E. when it wants to speed up, slow down, or turn
An ideal polarizer is placed in a beam of unpolarized light and the intensity of the transmitted light is 1.000. A second ideal polarizer is placed in the beam with its referred direction rotated 40° to that of the first polarizer
What is the intensity of the beam after it has passed through both polarizers? A) 0.7661 B) 0.4131 C) 0.5868 D) 0.6431 E) 0.5000
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
a.
its speed is constant.
b.
its speed is increasing.
c.
its speed is decreasing.
d.
its speed is a maximum.
e.
its speed is a minimum.
An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At an acidic pH, which structure is most likely:
A) structure (a) B) structure (b) C) structure (c) D) All three structures are equally possible.