A child is riding a merry-go-round, which has an instantaneous angular speed of 1.25 rad/s and an angular acceleration of 0.745 rad/ . The child is standing 4.65 m from the center of the merry-go-round
What is the magnitude of the acceleration of the child? A) 8.05 m/s2
B) 7.27 m/s2
C) 2.58 m/s2
D) 3.46 m/s2
E) 4.10 m/s2
A
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Why is Newton's version of Kepler's third law so useful to astronomers?
A) It can be used to determine the masses of many distant objects. B) It allows us to calculate distances to distant objects. C) It tells us that more-distant planets orbit the Sun more slowly. D) It explains why objects spin faster when they shrink in size.
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit. b. squint while looking in that direction. c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. e. reflect the rays from that direction on a shiny metal surface.
Why is it difficult to directly measure the size of a star's disk from Earth?
What will be an ideal response?
What is the equivalent resistance between points a and b when R = 12 ??
a.
20 ?
b.
16 ?
c.
24 ?
d.
28 ?
e.
6.0 ?