A boat is traveling at 4.0 m/s as it passes the starting line of a race. If the boat accelerates at 2.0 
for 3.0 seconds, then the velocity the boat has after the 3.0 seconds is
A. 21 m/s.
B. 9.0 m/s.
C. 13 m/s.
D. 10 m/s.
E. 4.0 m/s.
D. 10 m/s.
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The Northern and Southern hemispheres have equal illumination from the Sun
A) on the June and December solstices. B) on the March and September equinoxes. C) on all four of the equinoxes and solstices. D) only on the March equinox. E) at all times.
Only neutrinos can go faster than the speed of light
Indicate whether the statement is true or false
Cathode rays are
A. x-rays.
B. 
-rays.
C. electrons.
D. protons.
E. neutrons.
Friction: A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box?
A. 32 N B. 200 N C. 220 N D. 250 N E. 620 N