A 30. kg child stands at one end of a floating 20. kg canoe that is 10. ft long. The child walks to the other end of the canoe. How far does the canoe move in the water assuming water friction is negligible?
A) 10. ft
B) 4.0 ft
C) 6.0 ft
D) 8.0 ft
E) 2.0 ft
C
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If the wavelength of light is 400 nm in a substance where the speed of light is 
what is the wavelength of this light in air?
A. 313 nm B. 400 nm C. 511 nm D. 635 nm E. 940 nm
The planets move ________ through the sky, relative to the background stars.
A. west to east B. retrograde C. northeast to southwest D. east to west E. None of these choices is correct.
When Joshua brakes his speeding bicycle to a stop, kinetic energy is transformed to
A) potential energy. B) energy of motion. C) energy of rest. D) heat.
An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2. What is the magnitude of the force the object exerts on the floor of the elevator?
A. 59 N B. 10 N C. 89 N D. 68 N E. 78 N