A narrow slit is illuminated with sodium yellow light of wavelength 589 nm. If the central maximum extends to ±30.0°, how wide is the slit?
A. 0.500 mm
B. 2.20 × 10?6 m
C. 3.33 × 10?5 m
D. 1.18 ?m
E. 5.89 ?m
Answer: D
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In the setup shown, if water is flowing, the pressure gage should read:
(A) 640 kPa
(B) 760 kPa
(C) 820 kPa
(D) 940 kPa
A ball bearing rolls along a smooth horizontal tabletop, and crashes head-on into a second ball bearing of half its mass. If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision, what was the velocity of the first ball bearing after the collision?
A. -2.4 m/s B. +2.4 m/s C. -1.2 m/s D. +1.2 m/s E. -0.6 m/s F. +0.6 m/s
A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?
A. 40 solar masses B. 0.4 solar masses C. 8 solar masses D. 4 solar masses E. 200 solar masses
A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes down. B) It does not change. C) It goes up. D) This cannot be determined without knowing the volume of the top piece of wood.