To see his full height, Blinky Bill who is 1 meter tall needs a mirror that is at least
A) 0.33 m tall.
B) 0.50 m tall.
C) 0.75 m tall.
D) 1 m tall.
E) depends on distance from the mirror.
Answer: B
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The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days. What is the mass of Jupiter? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 1.33 × 1027 kg B) 1.50 × 1027 kg C) 1.72 × 1027 kg D) 1.89 × 1027 kg E) 3.08 × 1027 kg
Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the hill exerts on the sled parallel to the surface of the hill?
A. 200 N B. 120 N C. 160 N D. 150 N E. 0 N
It takes 10 J of work to push a charge into an electric field. Relative to its starting position it has gained a potential energy of
A) less than 10 J. B) 10 J. C) more than 10 J. D) none of the above
A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum stress in the heads of the tank is approximately:
(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa