A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left of the vertical and the second one at 45.0° to the right of the vertical. What is the tension force that the first wire exerts on the picture?
A) 69.6 N
B) 50.8 N
C) 98.1 N
D) 69.4 N
E) 23.8 N
A
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Standing Sound Waves: In a resonating pipe that is open at one end and closed at the other end, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at the open end and a displacement antinode at the closed end. D. is a displacement node at the closed end and a displacement antinode at the open end.
A gas is confined to a cylindrical container of radius 1 cm and length 1 m. The pressure exerted on an end face, compared with the pressure exerted on the long curved face, is:
A. smaller because its area is smaller B. smaller because most molecules cannot traverse the length of the cylinder without undergoing collisions C. larger because the face is flat D. larger because the molecules have a greater distance in which to accelerate before they strike the face E. none of these
Wrapping a hot potato in aluminum foil significantly reduces the rate at which it cools by
A) conduction. B) condensation. C) evaporation. D) melting.
Of the first exoplanets found, most were detected by:
A) noting the drop in the star's light as the planet transits its disk. B) imaging them with the HST in the infrared, where they are easier to stop. C) noting the Doppler shifts of the star as the planet orbits it from side to side. D) receiving radio transmissions from them, much like Jupiter emits. E) detecting the oxygen in their atmospheres spectroscopically.