Each of the following is a prediction of the theory of relativity (special or general). Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) Gravity is curvature of spacetime.
B) E = mc2
C) If you observe someone moving by you, you'll see his/her time running slow.
D) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
B
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What does escape velocity measure?
A. how fast an object needs to go to escape hostile space aliens B. how fast an object needs to go to escape a planet's gravity C. how far away an object needs to be to escape a planet's gravity D. the gravitational attraction at a planet's surface
The most abundant component of Titan's atmosphere is
A) methane B) carbon dioxide C) nitrogen D) oxygen
A heater is rated at 1200 watts for a 120-volt source.The resistance of the heater is __________
Fill in the blank(s) with correct word
A pencil that is 15.7 cm long is released from a vertical position with the eraser end resting on a table. The eraser does not slip as it tips over. Treat the pencil like a uniform rod
What is the angular speed of the pencil just before it hits the table? A) 13.7 rad/s B) 7.23 rad/s C) 3.70 rad/s D) 24.5 rad/s E) 16.8 rad/s