The acceleration of the moon is
A) directed toward Earth
B) directed along its forward direction of motion
C) zero.
D) directed outward away from earth
E) None of the above.
A
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Suppose we observe a Cepheid variable in a distant galaxy. The Cepheid brightens and dims with a regular period of about 10 days. What can we learn from this observation?
A) It will allow us to calculate the rotation rate of the galaxy. B) It will allow us to determine the mass of the galaxy. C) We can learn the distance to the galaxy. D) Under the rules of the International Astronomical Union, we will be entitled to naming rights for the galaxy.
Standing-wave vibrations are set up in a crystal wine glass with four nodes and four antinodes equally spaced around the 2.80-cm radius of the rim. If the resonant frequency of the glass is 8.50 kHz, what is the speed of the transverse waves moving around the glass?
a. 1 500 m/s b. 748 m/s c. 374 m/s d. 238 m/s
Why do the high-proton-number elements tend to get more unstable?
What will be an ideal response?
In brittle ceramics, the fracture strength is lower than the _________strength.
Fill in the blank(s) with the appropriate word(s).