An electric motor on an airplane operates on 24 volts and draws a current of 15 amperes. (a) What is the power consumption of the motor? (b) How much energy does the motor use during a 2 hour flight?
(a) 360 watts, (b) 2,592,000 J
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The composition of a planet's atmosphere be measured during a transit by analyzing
A) the excess absorption of starlight at specific wavelengths. B) the excess emission of starlight at specific wavelengths. C) the length and depth of the dip in light during the transit. D) the amplitude and period of the star's motion. E) the wobble in a star's position on the sky.
The best visible safety light in the darkroom that will emit low-energy photons is
A) violet. B) blue. C) green. D) any of the above E) none of the above
The absolute value of the electric potential at a distance of 4 m from a certain point charge is 200 V. What is the absolute value of this potential at a distance of 2 m from the same charge?
A) 200 V B) 50 V C) 400 V D) 100 V E) 600 V
A 5-turn square loop (10 cm along a side, resistance = 4.0 ?) is placed in a magnetic field that makes an angle of 30° with the plane of the loop. The magnitude of this field varies with time according to B = 0.50t2, where t is measured in s and B in T. What is the induced current in the coil at t = 4.0 s?
a. 25 mA b. 5.0 mA c. 13 mA d. 43 mA e. 50 mA