Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force they exert on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r
What is the magnitude of the new gravitational force? A) F/16
B) F/4
C) 16F
D) 4F
E) F/2
B
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A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
Both rolling resistance and drag increase with increasing speed as the square of the speed
What will be an ideal response?
Sometimes when you look into a curved mirror you see a magnified image (a great big you!) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will you see?
A) You will either see a little you or a great big you, depending on how near you are to the spoon. B) You will see a little you, upside down. C) You will see a little you, right side up. D) You won't see an image of yourself because no image will be formed. E) You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.
A student adds two vectors with magnitudes of 200 and 70 . Which one of the following is the only possible choice for the magnitude of their sum?
a. 100 c. 200 b. 280 d. 70