Refracting Telescope: A student constructs an astronomical telescope and wishes it to have a magnification of 10. If the telescope has an objective lens of focal length 0.50 m, what must be the focal length of the eyepiece?
A. 2.5 cm
B. 5.0 cm
C. 10 cm
D. 25 cm
Answer: B
Physics & Space Science
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Almost all stars are in binary systems
a. True b. False Indicate whether the statement is true or false
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Escape Speed: Planet X-39 has a mass equal to 1/3 that of Earth and a radius equal to 1/3 that of Earth. If V is the escape speed for Earth, what is the escape speed for X-39?
A. V B. 3V C. 6V D. V/9 E. 9V
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The units of momentum are
A. ML/T.
B. M/T.
C. 
D. 
E. 
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When we say charge is conserved, we mean that charge can
A. be saved, like money in a bank B. take equivalent forms C. be created or destroyed, as in nuclear reactions D. only be transferred from one place to another
Physics & Space Science