Which of the following has the longest wavelength?
a) Visible light
b) Gamma Ray
c) Ultraviolet
d) Radiowaves
Ans: d) Radiowaves
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A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The moment of inertia of the rod about this axis is 4.0 kg×m2 . The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the
vertical position? a. 3.4 rad/s b. 4.4 rad/s c. 4.3 rad/s d. 5.8 rad/s e. 6.8 rad/s
We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from
A) sending spacecraft to study the planets up close. B) examining spectral lines from the atmospheres of distant planets. C) examining high-resolution images of the planets made by orbiting telescopes. D) determining the orbital properties of the planets.
If the energy conversion efficiencies in a 3 step process are 30% for the first step, 40% for the second, and 20% for the third, the overall efficiency (step one to end) is about:
a. 2% b. 10% c. 20% d. 50% e. 90%
Almost all properties of other stars are described relative to our Sun
Indicate whether the statement is true or false