The figure above shows the geological time scale of Earth. Animals have been present on land for approximately ________ of the Earth's history.
A) 1/10
B) 1/4
C) 1/2
D) 3/4
A) 1/10
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The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere does the temperature of the sun change the most rapidly with distance?
a. 1,000 km
b. 2,300 km
c. 2,500 km to 4,000 km
d. 400 km
e. a and c
Which of the following is TRUE?
a) The average surface temperature of Venus is about 30 degrees Fahrenheit. b) Mercury has a very thick atmosphere made mostly of carbon dioxide. c) The runaway greenhouse effect causes the present temperatures on Mars to exceed thoseon Earth. d) Mercury rotates exactly one and a half times for every one revolution around the Sun. e) Venus has no volcanos on its surface.
What happens to the kinetic energy of a speedy proton when its relativistic mass doubles?
A) It doubles. B) It more than doubles. C) It less than doubles. D) It must increase, but it is impossible to say by how much.
A rocket moving in outer space maintains a constant acceleration (magnitude = 20 m/s2) while ejecting fuel at a speed of 15 km/s relative to the rocket. If the initial mass of the rocket is 3 000 kg, what is the magnitude of the thrust after 800 kg of fuel have been consumed?
a. 56 kN b. 48 kN c. 52 kN d. 44 kN e. 36 kN