Newton concluded that a force from the Earth had to act on the moon because
a. a force is needed to keep the moon in motion in its orbit.
b. a force is needed to pull the moon outward.
c. a force is needed to accelerate the moon toward Earth away from straight-line motion.
d. the moon moved at a constant velocity in a straight line.
e. all of the above
C
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Force on a Wire: A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire.
A. 0.75 N B. 1.5 N C. 3.0 N D. 6.0 N
The pigments used in paints or dyes used on fabrics work by
A. selective absorption B. birefringence C. polarization D. interference
In the equation A = B/C, the A and B are said to be _______________ proportional
a. directly b. inversely c. not d. exactly
If a = 3.0 mm, b = 4.0 mm, Q1 = 60 nC, Q2 = ?80 nC, and q = 36 nC in the figure, what is the magnitude of the electric force on q?
a.
5.0 N
b.
4.4 N
c.
3.8 N
d.
5.7 N
e.
0.60 N