Bob is coming toward you at a speed of 75 km/hr. You throw a baseball in his direction at 75 km/hr. What does he see the ball doing?
A) He sees the ball coming at him at 75 km/hr.
B) He sees the ball going away from him at 75 km/hr.
C) He sees the ball coming at him at 150 km/hr.
D) He sees the ball going away from him at 150 km/hr.
E) He sees the ball remaining stationary.
C
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What is the work done on the gas as it expands from pressure P1 and volume V1 to pressure P2 and volume V2 along the indicated straight line?
a.
(P1 ? P2)(V1 ? V2)/2
b.
(P1 + P2)(V1 ? V2)
c.
(P1 + P2)(V1 ? V2)/2
d.
(P1 P2)(V1 + V2)
The Roche limit is the point at which
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
Two extremely flat glass plates, 10.0 cm wide, touch at one end but are separated by a thin wire at the other end, forming a wedge
Light with a wavelength of 450 nm shines almost perpendicularly on the glass and forms fringes which are 1.80 mm apart. What is the diameter of the wire? A) 25.0 µm B) 10.0 µm C) 20.0 µm D) 12.5 µm E) 17.5 µm
Isotopes of an element have nuclei with
A) the same number of protons, but different numbers of neutrons. B) the same number of protons, and the same number of neutrons. C) a different number of protons, and a different number of neutrons. D) a different number of protons, and the same numbers of neutrons. E) the same number of protons, but different numbers of electrons.