After a ball tossed upward leaves your hand, the force of gravity on it
A) no longer acts.
B) gradually diminishes.
C) gradually increases.
D) remains constant.
E) changes direction.
Answer: D
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You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down
A) Work up is -, and the work down is -. B) Work up is +, and the work down is +. C) Work up is -, and the work down is +. D) Work up is +, and the work down is -.
Some young star clusters contain large numbers of T Tauri stars
Indicate whether the statement is true or false
Which of the following has virtually no effect on the structure of a planet?
A) its composition B) its size C) its magnetic field D) its mass
A monochromatic (single frequency, single wavelength) light ray in air (n = 1) enters a glass prism (n = 1.5). In the glass prism
a. both the frequency and the wavelength are the same as in air b. the frequency is the same, but the wavelength is greater than in air. c. the frequency is the same, but the wavelength is smaller than in air. d. the wavelength is the same, but the frequency is greater than in air. e. the wavelength is the same, but the frequency is smaller than in air.