A mixture of light and heavy molecules make up a sample of gas. If the temperature of the gas is constant, then all the molecules have the same average
A) speed.
B) kinetic energy.
C) both of these
D) none of the above
Answer: B
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A ball is thrown straight up. At what point does the ball have the most energy?
(a) At the highest point of its path. (b) When it is first thrown. (c) Just before it hits the ground. (d) When the ball is halfway to the highest point of its path. (e) Everywhere; the energy of the ball is the same at all of these points.
An object is placed 21 cm from a concave lens of focal length 25 cm. What is the magnification?
A) -0.54 B) 0.54 C) -0.32 D) -0.22 E) 0.22
Imagine two boats. One travels 5.0 m/s eastward relative to the earth and the other 3.4 m/s eastward relative to the earth. We set up a reference frame on each boat with the x axis pointing eastward, and choose the first boat (arbitrarily) to be the Home Frame. The second boat is thus the Other Frame. What is the sign of ?, according to the convention established in this chapter?
A. Positive B. Negative C. We are free to choose either sign.
What mass ratio is required to launch a rocket from the surface of Mars (escape velocity = 5.0 km/s) if its engines produce an exhaust velocity of 3.0 km/s?
A) 1.8 B) 5.3 C) 6.9 D) 7.4