A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its mass is ________.
A. zero
B. 200 kg
C. about 1/6 its mass on Earth
D. The answer depends on how close to the Moon the ship is orbiting.
Answer: B
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An 05 star has an H? line present in its spectra. What color is the line?
a. red
b. no color as the line is in the UV band
c. blue
d. no color as the line is in the infrared band
When humans get hot, they sweat in order to reduce their body temperature. Which of the key properties of life is this an example of?
A) growth and development B) reproduction C) response to environment D) order
A wheel rotating about a fixed axis has an angular position given by q = 3.0 - 2.0t3, where q is measured in radians and t in seconds. What is the angular acceleration of the wheel at t = 2.0 s?
a. -1.0 rad/s2 b. -24 rad/s2 c. -2.0 rad/s2 d. -4.0 rad/s2 e. -3.5 rad/s2
One observation supporting the idea of a spherical Earth is that ________.
A. a traveler moving south will see stars they could not previously see B. a ship moving away from the observer will move such that the hull is not seen, then the sails C. the shape of Earth's shadow on the Moon during an eclipse is circular D. All of these choices are correct.