A shoe on an inclined surface barely remains at rest when friction equals the
A) weight mg of the shoe.
B) component of mg perpendicular to the surface.
C) component of mg parallel to the surface.
D) none of the above
Answer: C
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Why do we have two high tides per day?
A. About half of Earth's water must flow past more geological barriers, slowing it down. B. The Moon and the Sun create separate tidal bulges, resulting in two high tides per day. C. There are two tidal bulges, and the rotation of Earth carries us through both of them every day. D. The rotation of Earth and the motion of the Moon around Earth drag both tidal bulges over us.
Magnetic field lines can never cross one another
Indicate whether the statement is true or false
When a mass of 0.350 kg is attached to a vertical spring and lowered slowly, the spring stretches a distance d. The mass is now displaced from its equilibrium position and undergoes 100 oscillations in 48.9 s. What is the stretch distance d?
A) 2.35 cm B) 2.97 cm C) 4.71 cm D) 5.94 cm E) 6.28 cm
If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas
a. temperature increases. b. volume increases. c. pressure increases. d. internal energy decreases.