A rotating flywheel can be used as a method to store energy. If it is required that such a device be able to store up to a maximum of 2.00 × 10^6 J when rotating at 400 rad/s, what moment of inertia is required?
a. 50 kgm2
c. 12.5 kgm2
b. 25 kgm2
d. 6.3 kgm2
B
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The ratio of the de Broglie wavelength of the electron in the n = 4 orbit in hydrogen to the wavelength in the n = 1 orbit is
A. 1. B. 2. C. 4. D. 16. E. 0.25.
The surface of the Sun is at approximately 5700 K, and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 2000 J of heat energy is transferred from the Sun to the Earth?
a. 5.78 J/K c. 7.24 J/K b. 5.97 J/K d. 6.55 J/K
Consider the decay ?+ ? ?+ + ?. This decay is
A) forbidden because conservation of baryon number is violated. B) forbidden because conservation of mass is violated. C) forbidden because conservation of energy is violated. D) allowed. E) forbidden because conservation of lepton numbers is violated.
A solar eclipse occurs on Earth when the
What will be an ideal response?