Answer:
a) wet marble , dry marble, newspaper, and towel
There is an identity of sin(2pi-x) = -sin(x) and cos(2pi-x) = cos(x). This is what we are going to use.
<span>(7pi/6) = (2pi)-(pi/6)
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Therefore:
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1) sec(7pi/6) = 1/cos(2pi-(pi/6)) = 1/cos(pi/6) = 2sqrt(3)/3
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<span>2) cos(7pi/6) = cos(pi/6) = sqrt(3)/2
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Answer:
Explanation:
The acceleration due to gravity is in the downward direction. This means that it will oppose the upward motion of the stone. This will cause the stone to stop and begin to fall. Therefore, the sign of the final velocity is negative, since it is in the downward direction. The final velocity is given by:
This is the mechanism behind a thermocouple (choice D). The two metals generate a magnetic field between them when the temperature is varied, and this causes a voltage (potential difference) to form between the metals. An electronic meter is calibrated to translate this voltage difference into a temperature value for a user to read.