A loop of wire in a generator produces alternating current by:
a. rotating in a constant electric field.
b. rotating through areas of high and low electrical force.
c. creating current by rotating in an existing magnetic field.
d. creating a varying magnetic field with its rotational kinetic energy.
e. being wound around a metal core to produce an electromagnet.
c
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What is the Q-value for the reaction where the products are 0.006 u less than the reactants? (1 u = 931.5 MeV/c2)
a. 11 MeV b. 22 MeV c. 3.9 MeV d. 5.6 MeV e. 8.4 MeV
Minimal orbit speed about Earth is about 8 km/s, and about Jupiter is
A) less than 8 km/s. B) more than 8 km/s. C) about 8 km/s.
What is the source of the magnetic field in the Crab Nebula? What is at the very center?
A.) A black hole. B.) A neutron star. C.) A white dwarf. D.) Nothing. The star blew itself up. E.) An excited Nebula.
Heat is
A) temperature. B) thermal energy. C) thermal energy flowing from hot to cold. D) radiant energy.