Charge is distributed uniformly on the surface of a spherical nonconducting shell. A point particle with charge q is inside. The electrical force on the particle q is least when:
A) it is near the inside surface of the shell
B) it is at the center of the shell
C) it is halfway between the shell center and the inside surface
D) it is near, but not at, the center of the shell
E) all of the above (the force is zero everywhere inside)
E) all of the above (the force is zero everywhere inside)
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A rock is thrown vertically into the air. At the top of its path, its acceleration is
A) zero. B) 10 m/s2. C) between 0 and 10 m/s2. D) greater than 10 m/s2.
A high-voltage powerline operates at 500,000 V rms and carries an rms current of 500 A. If the resistance of the cable is 0.050 ?/km, what is the resistive power loss in 200 km of the powerline?
A. 250 kW B. 500 kW C. 1 megawatt D. 2.5 megawatts E. 250 megawatts
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. In what direction does the wreckage move just after the collision?
A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E
After one half-life, a sample of a particular
radioactive material a) is twice as massive as the original sample of material. b) has its half-life reduced by one half. c) has only half the original activity. d) is no longer radioactive at all.