The Babcock model of the solar magnetic cycle explains the sunspot cycle as primarily a consequence of the Sun's ____
a. differential rotation
b. helioseimologic activity
c. coronal mass ejections
d. convection currents
e. meridional flow
a
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Imagine for a minute that the Moon is held in its orbit about the Earth by electrical forces rather than by gravitation. What electrical charges ?Q on the Earth and +Q on the Moon are necessary to hold the Moon in a circular orbit with a period of 27.3 days? The Earth-Moon distance is 384,000 km and the mass of the Moon is 7.35 × 1022 kg.
What will be an ideal response?
An ideal gas undergoes an adiabatic process while -25 J of work is done on it. What is the change in the internal (thermal) energy of the gas?
A) 0 J B) 25 J C) -25 J D) 50 J E) -50 J
The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
What will be an ideal response?
State the specific heat of water in terms of standard SI energy units (joules)