You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
A) The net force acting on the object is zero.
B) No forces of any kind are acting on the object.
C) The only force acting on the object is gravity.
D) The only force acting on the object is air resistance.
E) Some unseen force must be keeping the object in motion.
A) The net force acting on the object is zero.
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An all-terrain vehicle of 2000 kg mass moves up a 15.0° slope at a constant velocity of 6.00 m/s. The rate of change of gravitational potential energy with time is
a. 5.25 kW. b. 24.8 kW. c. 30.4 kW. d. 118 kW. e. 439 kW.
A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence,
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5 
B. 30.0
C. 20.2
D. 5.70
E. this cannot happen
Which season is shown in the picture for the southern hemisphere?
a. spring
b. summer
c. fall
d. winter
NASA uses the famous "Vomit Comet," a KC-135 cargo plane, to provide astronauts and scientiest a simulated zero-gravity environment. The plane flies in a parabolic arc, at the top of which a passenger feels "weightless." This is because
A. the acceleration of the passenger is nearly zero at the top of the arc B. the gravitational force exerted by Earth on the passenger is nearly zero at the top of the arc C. the force exerted by the floor of the plane on the passenger is nearly zero at the top of the arc D. a and b