A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.5 N/C, Ey = Ez = 0 . If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
a. 40 m/s
b. 20 m/s
c. 60 m/s
d. 80 m/s
e. 180 m/s
b
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General Questions: A horse pulls a cart with force 
. As a result of this force the cart accelerates with constant acceleration. The magnitude of the force that the cart exerts on the horse
A. is zero newtons.
B. equal to the magnitude of 
.
C. less than the magnitude of 
.
D. greater than the magnitude of 
.
E. cannot be determined without knowing the mass of the horse.
What thermodynamic quantity is held constant in Boyle's law?
a. pressure b. volume c. temperature d. Both pressure and volume are each held constant.
A sample of helium (He) occupies 44.8 L at STP. What is the mass of the sample?
A) 2 g B) 4 g C) 6 g D) 8 g E) 10 g
The collision of two neutron stars might be detected as what?
A. a nebula. B. an atmospheric window C. an emission-line spectrum. D. a gamma-ray burst. E. All of these choices are correct.