Cart A, of mass m, starts from rest and travels in a straight line with acceleration a. It traverses a distance x in time t. Cart B, of mass 4m, starts from rest and travels in a straight line with acceleration 
. At time t it has traversed the distance
A.
.B.
.C.
D.
E.
Answer: B
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Two cars collide head-on on a level friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?
A) It was always zero. B) It was never zero. C) It was not initially zero, but ended up zero.
Your weight is the force
A) due to gravity only. B) you exert against a supporting surface. C) equal to your normal force on any surface.
A particle (charge = +2.0 mC) moving in a region where only electric forces act on it has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B.
A. 3.0 J B. 2.0 J C. 5.0 J D. 8.0 J E. 10.0 J
In a hydrogen atom, an electron with n = 7 can exist in how many different quantum states?
A) 6 B) 7 C) 15 D) 98