Volcanic heat comes from
A. radioactive explosions
B. the weight of rock
C. accumulated sunlight
D. fusion deep in the Earth
Answer: A. radioactive explosions
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Two infinite parallel surfaces carry uniform charge densities of 0.20 nC/m2 and ?0.60 nC/m2 . What is the magnitude of the electric field at a point between the two surfaces?
a. 34 N/C b. 23 N/C c. 45 N/C d. 17 N/C e. 90 N/C
Two light bulbs are connected to a battery as shown in the circuit diagram below. The resistances of bulb A and B are 40 ? and 10 ?, respectively. The lines represent connecting wires with negligible resistance, and the arrows indicate the direction of conventional current flow. Which bulb conducts the greater current I ?
A. Bulb A
B. Bulb B
C. Each conducts the same current.
D. No current flows in this circuit.
E. There is no way to tell with the given information
A uniform solid cylindrical log begins rolling without slipping down a ramp that rises 28.0° above the horizontal. After it has rolled 4.20 m along the ramp, what is the magnitude of the linear acceleration of its center of mass?
A) 9.80 m/s2 B) 4.60 m/s2 C) 3.29 m/s2 D) 3.07 m/s2 E) 2.30 m/s2
An astronaut at Earth's surface has a mass of 50 kg and a weight of 500 N. If she were floating freely inside a space habitat in remote space, she would have
A) no weight and less mass. B) no weight and the same mass. C) more weight and no mass. D) none of the above