Earth has been gradually warming over the past few decades. Based on a great deal of evidence, scientists believe that this warming is caused by ________
A) the human release of chemicals called CFCs into the stratosphere
B) the increase in forest fires during recent years
C) the fact that our politicians spout a lot of hot air
D) human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere
D
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The electric flux through the two adjacent spherical surfaces shown below is known to be the same.
It is also known that there is no charge inside either spherical surface. We can conclude that
A. there is no electric field present in this region of space. B. there is a constant E field present in this region of space. C. the electric flux has a constant value of zero. D. any of the above may be correct. E. only (a) and (b) above may be correct.
In the figure, the coefficient of kinetic friction between the surface and the larger block is 0.20, and the coefficient of kinetic friction between the surface and the smaller block is 0.30. If F = 14 N and M = 1.0 kg, what is the magnitude of the acceleration of either block?
a.
2.0 m/s2
b.
1.3 m/s2
c.
1.5 m/s2
d.
1.8 m/s2
e.
3.5 m/s2
YSOs are in hydrostatic equilibrium
a. True b. False Indicate whether the statement is true or false
The kinetic energy of the bob on a simple pendulum swinging in simple harmonic motion has its maximum value when the displacement from equilibrium is at what point in its swing?
a. zero displacement b. 1/4 the amplitude c. 1/2 the amplitude d. equal the amplitude