Power: A 5.0-V battery storing 43.0 kJ of energy supplies 1.5 A of current to a circuit. How much energy does the battery have left after powering the circuit for 1.0 h?
A. 16 kJ
B. 27 kJ
C. 43 kJ
D. 41 kJ
Answer: A
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The fastest we could accelerate a chemical rocket to (assuming using 100 stages!) is approximately
A) 50% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 100% of the speed of light
Which of the following quantities has units of a velocity? (There could be more than one correct choice.)
A) 40 km southwest B) -120 m/s C) 9.8 m/s2 downward D) 186,000 mi E) 9.8 m/s downward
Friction: In a shuffleboard game, the puck slides a total of 12 m on a horizontal surface before coming to rest. If the coefficient of kinetic friction between the puck and board is 0.10, what was the initial speed of the puck?
A. 4.8 m/s B. 48.5 m/s C. 3.8 m/s D. 4.3 m/s
What is meant by the redshift?
A. Distant galaxies appear red in color as their light passes through dust. B. The temperature of distant galaxies is decreasing. C. The spectral lines of the galaxies are shifted to redder wavelengths. D. Distant galaxies appear red in color due to having older stars. E. None of these choices is correct.