If 480 C pass through a 4.0-? resistor in 10 min, what is the potential difference across the resistor?
a.
3.6 V
b.
2.8 V
c.
2.4 V
d.
3.2 V
e.
5.0 V
d
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In an isochoric process, the internal (thermal) energy of a gas decreases by 50 J. How much work is done by the gas during this process?
A) -25 J B) -50 J C) 0 J D) 50 J E) 25 J
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
A. the speed of radio waves. B. the speed of light. C. the speed of gamma rays. D. all of the above. E. only (a) and (b) above.
Two parallel wires are separated by 0.25 m. Wire A carries 4.1 A and Wire B carries 10 A, both currents in the same direction. The magnetic permeability in empty space µ0 = 4p × 10^-7 T×m/A. The magnitude of the force on 1.4 m of Wire A is:
a. 2.6 × 10^–5 N. c. less than 1.0 × 10^–5 N. b. 4.6 × 10^–5 N. d. 3.2 × 10^–5 N.
If we found a solar system where the central star's mass was double that of the Sun, what would be the period a planet orbiting 1 AU from the central star?
A) more than a year B) less than a year C) about a year D) impossible to say, since we need to know the mass of the planet to predict its period