This image shows two tall volcanoes on Venus. Why is it yellow?
A) The yellow color is arbitrary because this image was created with radar data rather than visible light.
B) Lava from volcanoes on Venus is yellow rather than the red of lava on Earth.
C) The camera used to take this photograph had a yellow filter on it.
D) Venus is yellow all over, apparently as a result of some sort of sulfurous dust that coats its surface.
A) The yellow color is arbitrary because this image was created with radar data rather than visible light.
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We have sent several spacecraft on trajectories that will ultimately take them into interstellar space (including Pioneer 10 and 11, Voyager 1 and 2, New Horizons). How long will it take these spacecraft to travel as far as the nearest stars?
A) tens of thousands of years B) a few hundred years C) a few decades D) never, because they will rust and fall apart E) about a thousand years
The fundamental nuclear reaction occurring in the core of the Sun is
A) nuclear fission. B) radioactive decay. C) nuclear fusion of hydrogen into helium. D) nuclear fusion of helium to carbon.
An object attached to an ideal massless spring is pulled across a frictionless surface. If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at 2.0 m/s2, what is the mass of the object?
A) 20 kg B) 17 kg C) 22 kg D) 26 kg
How many revolutions per second are needed for a centrifuge to produce an acceleration of 1200g at a radius arm of 15.0 cm?
a. 40.7 rev/s c. 81.4 rev/s b. 44.6 rev/s d. 151 rev/s