Two hockey pucks are initially at rest on a horizontal plane of frictionless ice. Puck A has twice the mass of puck B. Suppose we exert a constant force on puck A until it has travelled 2 m from its starting position. We exert a force of the same magnitude on puck B until it has travelled 1 m from its starting position. How do the pucks’ kinetic energies compare when we stop pushing them?
A. KA = 4KB
B. KA = 2KB
C. KA = KB
D. KB = 2KA
E. KB = 4KA
F. Some other relationship (specify)
B. KA = 2KB
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, 
, 
, and 
. Vectors 
and 
each have a magnitude of 7.0 cm, and
vectors 
and 
each have a magnitude of 4.0 cm. Find the x and y components of the sum of these four vectors.
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a. True b. False Indicate whether the statement is true or false
A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A) 20.9° B) 47.5° C) 51.8° D) 30.0° E) 14.9°
The force required to maintain a constant velocity for an astronaut in free space is equal to
A) zero. B) the mass of the astronaut. C) the weight of the astronaut. D) the force required to stop the astronaut. E) none of the above