Photovoltaic cells will never be much cheaper than now
What will be an ideal response?
In the past, the price has dropped steadily, so it is unlikely that that will not
continue. We should expect the decrease in price to continue.
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The three blocks in the figure are on a frictionless surface. If F = 48.0 N, m1 = 2.0 kg, m2 = 1.5 kg, and m3 = 3.5 kg, what is the tension in the cord?
a.
24.0 N
b.
6.86 N
c.
13.7 N
d.
32.0 N
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the acceleration of the deuteron to that of the proton is:
a. 1. b. 2. c. 0.5. d. There is no acceleration in this case.
The mission of ___________ health is the fulfillment of society's interest in ensuring the conditions in which people can be healthy.
What will be an ideal response?
Dmitri places one end of a copper rod in a heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sink is tripled?
a. 0.33 b. 1/9 c. 3.0 d. 9.0