Relative Velocity: Your motorboat can move at 30 km/h in still water. What is the minimum time it will take you to move 12 km downstream in a river flowing at 6.0 km/h?
A. 20 min
B. 22 min
C. 24 min
D. 30 min
Answer: A
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The Sun's life time is 10 billion years. About how long is the lifetime of a star with a star has a mass of 0.1 MSun and a luminosity of 0.01 LSun?
A) 1 billion years B) 100 million years C) 100 billion years D) 10 million years
A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?
a) positive work was done b) negative work was done c) zero work was done
Which of the following best describes the composition of the particles forming Saturn's rings?
A) methane ice B) hydrogen and helium C) water ice D) metallic grains E) volcanic rock
The "pulse" from a pulsar is due to the rapidly expanding and contracting outer shell of the star
Indicate whether the statement is true or false