When the IDL is crossed going from east to west, a day is ______________
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A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
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A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 ?) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 ?t) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
A. 50 mA B. 1.6 A C. 0.32 A D. zero E. 0.80 A
A guitar string is fixed at both ends. If you tighten it to increase its tension
A) the frequencies of its vibrational modes will increase but its wavelengths will not be affected. B) the wavelength increases but the frequency is not affected. C) both the frequency and the wavelength increase.
A 4.0 ?F capacitor is connected in series with a 2.0 k? resistor across a 20-V DC source and an open switch. If the switch is closed at t = 0 s, what is the charge on the capacitor at t = 9 ms?
A) 0 C B) 37% of the minimum charge C) 68% of the maximum charge D) 68% of the minimum charge E) 96% of the maximum charge