When there is a 14.0-A current through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A) $0.24
B) $1.04
C) $2.16
D) $3.39
D
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Does all electromagnetic radiation travel at the speed of light?
What will be an ideal response?
Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is up the incline)
A. 7.16 
B. 5.84
C. 2.98
D. 1.53
E. 3.90
Two charges are separated by a certain distance. If the magnitude of each charge is doubled the force on each charge is
a. halved. b. doubled. c. tripled. d. quadrupled.
A planet has mass M = 8.00 × 10^23 kg. At what distance will the centripetal acceleration of an orbiting space station be equal to the gravitational acceleration on Earth's surface? (G = 6.67 × 10^–11 m3·kg–1·s–1)
a. 2.33 × 10^6 m b. 5.44 × 10^12 m c. 5.23 × 10^14 m d. 1.18 × 10^35 m