State the principle of superposition
What will be an ideal response?
When two or more waves pass through the same region of space at the same time, it is found that for many waves the actual displacement is the vector (or algebraic) sum of the separate displacements.
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To calculate the masses of stars in a binary system, we must measure their
A) orbital period and average orbital distance. B) spectral types and distance from Earth. C) absolute magnitudes and luminosities. D) luminosities and distance from Earth.
When discussing stellar lives, astronomers divide stars by mass into low-mass, intermediate-mass, and high-mass stars. Which category has the longest lifetimes?
A) low-mass stars B) intermediate-mass stars C) high-mass stars
The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force toward Earth becomes
A) half. B) three-quarters. C) one-fourth. D) none of the above
Who was the first to determine the electron's charge?
a. Franklin b. Coulomb c. Millikan d. Faraday