A horizontal force of 675 N is needed to overcome the force of static friction between a level floor and a 300-kg crate. What is the acceleration of the crate if the 675-N force is maintained after the crate begins to move and the coefficient of kinetic friction is 0.15?
a. 0.78 m/s2
b. 3.7 m/s2
c. 3.3 m/s2
d. 1.5 m/s2
e. 1.8 m/s2
a
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A uniform electric field 
is present in the region between the infinite parallel planes of charge A and B, and a uniform electric field 
is present in the region between the infinite parallel planes of charge B and C. When the planes are vertical and the fields are both non-zero,
A.
and are both directed to the right.B.
and are both directed to the left.C.
points to the right and to the left.D.
points to the left and to the right.E.
A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the horizontal distance to the point where the football hits the ground if we neglect air?
A) 20 m B) 35 m C) 18 m D) 60 m E) 30.0 m
An Earth satellite is in an elliptical orbit. The satellite travels faster when it is
A) nearest Earth B) farthest from Earth C) constant speed everywhere in orbit and in close orbit travels faster when orbiting 4) the Moon. 5) Earth. 6) both about the same for the same altitudes.
When a hydrogen atom absorbs a photon that raises it to the n = 5 state, how many different energies are possible for the photon(s) that may be emitted as the atom eventually returns to the ground state?
a. 4 b. 5 c. 6 d. 10 e. The correct answer is not given.