Satellite Motion: The innermost satellite of Jupiter orbits the planet with a radius of 422 × 103 km and a period of 1.77 days. What is the mass of Jupiter? (G = 6.67 × 10-11 N ? m2/kg2)
A. 1.33 × 1027 kg
B. 1.50 × 1027 kg
C. 1.72 × 1027 kg
D. 1.89 × 1027 kg
E. 3.08 × 1027 kg
Answer: D
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Lenz's Law: The wire in the figure carries a steady current I. What is true about the currents induced in each of the three loops shown? The wire and the three loops are all in the same plane.
A. No current is induced in any loop. B. The currents are counterclockwise in all three loops. C. The currents are clockwise in all three loops. D. Loop A has clockwise current, loop B has no induced current, and loop C has counterclockwise current. E. Loop A has counterclockwise current, loop B has no induced current, and loop C has clockwise current.
An object falling vertically at a speed of 20 m/s lands in a snowbank and comes to rest 0.5 s later. The object’s average acceleration during this interval is
A. Upward B. Downward C. Zero
A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A) 16 cm B) 17 cm C) 18 cm D) 19 cm
A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?
a. 21 W b. 11 W c. 5.4 W d. 2.2 W e. 1.1 W