In the first step of the p-p fusion chain, two ____________ are combined to make a heavy hydrogen nucleus, also known as a _____________. Byproducts of the reaction are _____________ and ______________
Fill in the blank(s) with correct word
hydrogen, deuterium, positron, neutrino
or
deuterium, hydrogen, neutrino, positron
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____________________ is a measure of the amount of energy due to the motion of the particles in a gas, liquid, or solid
Fill in the blank(s) with correct word
The Department of Energy develops a new reversible engine which has a COP of 4 when operated as a refrigerator and a COP of 5 when operated as a heat pump. What is its efficiency when operated as an engine doing work?
A) 10.% B) 20.% C) 25.% D) 45.% E) 80.%
The sky is blue because molecules in the atmosphere scatter blue light more effectively than red light
Indicate whether the statement is true or false
A toy gyroscope (a.k
a. a top) consists of a solid disk with a thin rod projecting perpendicular to the center of the disk. The rod, which serves as the rotational axis for the gyroscope, projects on both sides of the disk. The gyroscope is placed with one end of the axis on the surface of the table, and spun so that the rotation of the disk viewed from above is counterclockwise. Alas, the axis of rotation is not quite perpendicular table surface and so the gyroscope precesses. Viewing from above, with the end of the axis in contact with the table staying in the same spot, in what direction does the other end of the axis of the gyroscope precess? a. The precession is clockwise. b. The precession is counterclockwise. c. In the northern hemisphere the precession is clockwise, but in the southern hemisphere it is counterclockwise. d. In the northern hemisphere the precession is counterclockwise, but in the southern hemisphere it is clockwise.