If a virtual image is formed along the principal axis 12 cm from a concave mirror with the focal length 23 cm, what is the object distance from the mirror?
a. 11.0 cm
b. 25 cm
c. 13 cm
d. 7.9 cm
e. 4.0 cm
d
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Indicate whether the statement is true or false
How do we know sunspots have magnetic fields?
A. Wien's law B. the Zeeman effect C. We have measured the sunspots' fields with spacecraft. D. the Hubble effect E. None of these choices is correct.
Two small balls, A and B, attract each other gravitationally, exerting a force of magnitude F on each other
If we now double both masses and the separation of the balls, what will now be the magnitude of the attractive force that they exert on each one? A) 16F B) 8F C) 4F D) F E) F/4
A box slides up an incline with an angle of elevation ?. When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction. What is the minimum value of the coefficient of static friction for this to occur?
a. ?s = tan? b. ?s = sin? c. ?s = cos? d. ?s = 1