When a car goes around a circular curve on a level road without slipping,
a. no frictional force is needed because the car simply follows the road. b. the frictional force of the road on the car increases when the car's speed decreases.
c. the frictional force of the road on the car increases when the car's speed increases.
d. the frictional force of the road on the car increases when the car moves to the outside of the curve. e. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
C
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In a tetragonal unit cell, a=b but c is not equivalent. Which plane is therefore not equivalent?
(a) (100) (b) (010) (c) (010) (d) (001)
The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
An 1800 kg car traveling at 35.0 m/s strikes a wall. If the car comes to rest in 0.500 seconds, then the average force of the wall on the car is
A. 
B. 
C. 
D. 
E. 
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.