A metal sphere of radius 10 cm carries a charge of +2.0 ?C uniformly distributed over its surface
What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) 4.0 × 107 N/C
B) 8.0 × 107 N/C
C) 8.0 × 105 N/C
D) 4.2 × 106 N/C
E) 4.0 × 105 N/C
C
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A ball of aluminum is at a depth of 100.0 m under water whose density is 
The bulk stress on the ball due to the water is
a. 
b. 
c. 
d. 
e. 
What does Hubble's law tell us?
A) The longer the period of a Cepheid variable, the greater its luminosity. B) The more distant a galaxy, the faster it is moving away from us. C) The faster a spiral galaxy's rotation speed, the more luminous it is. D) For every force, there is an equal and opposite reaction force.
A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consists of 2 protons and 2 neutrons) moving at speed v
If the collision is perfectly elastic, what speed will the alpha particle have after the collision? (Assume the neutron's mass is equal to the proton's mass.) A) zero B) 2v/3 C) 3v/5 D) 5v/3
Because a white dwarf is no longer burning fuel, it is more accurately described as being a
A) stellar remnant. B) failed star. C) protostar. D) black elf.