On a two-lane highway (not divided), a car headed north experiences a centripetal acceleration directed toward the west. Simultaneously, a truck passes the car, headed south in the other lane. The direction of the centripetal acceleration on the truck is
A. north.
B. east.
C. south.
D. west.
Answer: D
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Which of the following explains why, a million years from now, Alpha Centauri will no longer be the nearest star system to our own?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) outward pressure due to hot gas B) the strong force between protons C) electromagnetic repulsion between protons D) neutrinos produced by nuclear fusion drag gas outward.
An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2.5 . Which of the following statements is true?
a. This is the only true statement. b. The focal length of the mirror is 30 cm. c. The image is real. d. The image is inverted.
If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a
A) period of 1000 s. B) speed of 1000 m/s. C) wavelength of 1000 m. D) frequency of 1000 Hz. E) wavelength of 1000 km.