A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 34.0° above horizontal
The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
A)
0.156
B)
0.188
C)
0.0441
D)
0.0851
E)
0.103
A
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The basic building blocks of matter are protons, neutrons, and electrons
Indicate whether the statement is true or false
The planet-wide flow of air from Earth's equator to the colder poles is called Hadley circulation. An example of this effect is also seen
a. on Mars b. on Mercury c. on Venus d. nowhere else in the solar system
Astronomers know the universe is expanding because
A) everything is moving away from us. B) all stars are moving away from us. C) most galaxies are moving away from us. D) galaxies farther away are moving away from us faster. E) there is a cosmic microwave background.
An object of mass m is attached to string of length L. When it is released from point A, the object oscillates between points A and B. Which statement about the system consisting of the pendulum and the Earth is correct?
a.
The gravitational potential energy of the system is greatest at A and B.
b.
The kinetic energy of mass m is greatest at point O.
c.
The greatest rate of change of momentum occurs at A and B.
d.
All of the above are correct.
e.
Only (a) and (b) above are correct.