A ballet dancer is spinning in the middle of a horizontal frictionless stage. Which of the following things could he change by moving parts of his body or his whole body? (There could be more than one correct choice.)
A) his total kinetic energy
B) the location of his center of mass (or center of gravity)
C) his angular momentum
D) the horizontal component of his linear momentum
E) his rotational kinetic energy
F) his translational kinetic energy
G) his moment of inertia
A, B, C, E, F, G
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What is the magnitude of the electric field 2.8 cm from a tiny object that carries an excess charge of -16 nC? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A) 180,000 N/C B) 5100 N/C C) 1.8 × 1014 N/C D) -180,000 N/C E) -5100 N/C
Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational b. electromagnetic c. strong d. weak e. It could be any one of the above or some combination of them.
Superconductors have a primary advantage in that they will _______
a. reduce heating losses in transmission lines b. provide large magnetic fields for levitation c. be able to conduct more current d. allow electric motors to run almost forever
A capacitor in a single-loop RC circuit is charged to 85% of its final potential difference in 2.4 s. What is the time constant for this circuit?
a. 1.5 s b. 1.3 s c. 1.7 s d. 1.9 s e. 2.9 s