Complete the reaction: e + p ? _______________; the reaction applies to ________________
a. n, white dwarfs b. ?, neutron stars
c. n + ?, white dwarfs d. n + ?, neutron stars
d
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For stars on the main sequence, the luminosity can be estimated by the formula L = ____________________
Fill in the blank(s) with correct word
Two long parallel wires carry unequal currents in the same direction. The ratio of the currents is 3 to 1 . The magnitude of the magnetic field at a point in the plane of the wires and 10 cm from each wire is 4.0 mT. What is the larger of the two currents?
a. 5.3 A b. 3.8 A c. 4.5 A d. 3.0 A e. 0.5 A
What source of energy might keep water beneath the surface of Enceladus liquid?
A) tidal heating only B) radioactive decay only C) tidal heating and radioactive decay D) heat released from a partially molten core
What is the Lorentz factor,
for a speed of 0.800 c?
A. 0.800 B. 1.67 C. 0.600 D. 0.360 E. 1.25