What are the main constituents of the solar wind? Which travel faster?
What will be an ideal response?
The lower mass electrons move much faster than the protons that lag behind.
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In epoxy and polyester thermoset polymers, liquid resin and liquid _________are mixed to form a liquid that transforms to a solid.
Fill in the blank(s) with the appropriate word(s).
The mass of a black hole concentrated in an infinitesimally small volume with zero radius, is known as a(n) _______________
Fill in the blank(s) with correct word
Magnetic Field of a Long Wire: A long straight wire has a constant current flowing to the right. A rectangular metal loop is situated above the wire, and also has a constant current flowing through it, as shown in the figure. Which one of the following statements is true? 
A. The net magnetic force on the rectangle is upward, and there is also a nonzero torque on the rectangle. B. The net magnetic force on the rectangle is zero, and the net torque on it is zero. C. The net magnetic force on the rectangle is downward, and there is also a nonzero torque on the rectangle. D. The net magnetic force on the rectangle is zero, but there is a nonzero torque on the rectangle. E. The net magnetic force on the rectangle is downward, and the net torque on it is zero.
What makes variable stars useful in determining star distances?
A. They are brighter than other stars. B. Their exact location in the H-R diagram is known. C. They are easier to spot than ordinary stars. D. Their luminosity can be determined from their pulsation period.