Radio telescopes are ____ telescopes
a. Reflecting
b. Refracting
c. Deflecting
d. Compound
e. Retracting
A
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Suppose you built a scale-model atom in which the nucleus was the size of a tennis ball. About how far would the cloud of electrons extend?
A) several centimeters B) a few meters C) a few tens of meters D) several kilometers E) to the Sun
A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
A. 22 s B. 19 s C. 25 s D. 28 s E. 40 s
Answer the following statement(s) true (T) or false (F)
Which of the following pairs of forces are third-law partners? Answer T if the two forces described are third-law partners, F if they are not. 1. A thrust force from its propeller pulls a plane forward; a drag force pushes it backward. 2. A car exerts a forward force on a trailer; the trailer tugs backward on the car. 3. A motorboat propeller pushes backward on the water; the water pushes forward on the propeller. 4. Gravity pulls down on a person sitting in a chair; the chair pushes back up on the person.
Composite particles that are composed of a quark and antiquark pair are called
A) nucleons. B) leptons. C) baryons. D) hadrons. E) mesons.