A 62.0-kg woman runs up a flight of stairs having a rise of 4.28 m in a time of 4.20 s. What average power did she supply?
a. 63.2 W
b. 619 W
c. 596 W
d. 629 W
e. 609 W
b
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Which of the natural forces bind atomic nuclei?
a. Newtonian force b. gravitational force c. weak force d. electromagnetic force e. strong force
Estimation: Estimate the number of times the earth will rotate on its axis during a human's lifetime.
A. 3 × 104 B. 3 × 105 C. 3 × 106 D. 3 × 107 E. 3 × 108
Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis).
A. 1.9 V B. 1.4 V C. 2.2 V D. 2.8 V E. 4.0 V
Which of the following appears least important in the evolution of life here?
A) the magnetic field of the Earth B) the correct distance from the Sun C) an Earth-like atmosphere D) the presence of water and carbon atoms E) the stable luminosity of the Sun for billions of years