The fact that a pin placed carefully on the surface of the water can remain there without sinking is best explained by
A) gravitation.
B) gauge pressure.
C) surface tension.
D) Archimedes' principle.
E) viscosity.
C
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Suppose you know the speed of a spacecraft in kilometers per second. How would you calculate its speed in kilometers per hour?
A) Multiply by 60 and then multiply by 60 again. B) Divide by 60 and then divide by 60 again. C) Multiply by 24. D) Divide by 24.
What approximate weight of air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?
A) 0.01 N B) 10 N C) 100 N D) 1000 N
In ________ models, the Sun is assumed as the center of the solar system.
A. Heliocentric B. Epicyclic C. Anthropomorphic D. Geocentric
Uniform Electric Fields: Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10-19 C)
A. 2.4 × 10-19 J B. 4.8 × 10-19 J C. 7.2 × 10-19 J D. 9.6 × 10-19 J