A metal rod of length L in a region of space where a constant magnetic field points into the page rotates clockwise about an axis through its center at constant angular velocity ?. While it rotates, the point(s) at highest potential is(are)
a.
A.
b.
B.
c.
C.
d.
D.
e.
A and E.
e
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Why are Cepheid variables important?
A) Cepheid variables are stars that vary in brightness extremely rapidly as they rotate on their axes. B) Cepheid variables are stars that brighten and dim with a period that is directly related to the star's luminosity. C) Cepheids are a type of young galaxy that helps us understand how galaxies form. D) Cepheids are supermassive stars that we observe because they will soon undergo supernovae.
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. As a result, the spring is compressed by 20 cm. The mass is then released. What is the amount of work required to compress the spring?
What will be an ideal response?
The number of states in the He+ ion corresponding to the principle quantum number n = 5 are
a. 18 b. 25 c. 50 d. 9 e. 11
Define acceleration, and give an example