How does the heat energy from the Sun reach us through the vacuum of space?
a. conduction
b. radiation
c. convection
d. none of the above choices are valid
b
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A heat pipe having an effective length of 80 cm uses methanol as the working fluid. At an operating temperature of 20ºC the methanol flow rate is 12 mg/s, and the heat pipe uses an axially grooved wick arrangement with 60 equally spaced 2.1-mm-deep grooves. Determine the width of the grooves.
What will be an ideal response?
A mass src="https://sciemce.com/media/4/d7a1e25d698e02ae34.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless incline as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
2.00 kg, 
is 1.00 kg, M is 4.00 kg, and the angle is 60.0 degrees, then what is the acceleration of
A. 3.98 
down
B. 3.27
down
C. 3.15
down
D. 2.94
down
E. 1.64
down
At which of the following temperatures would one liter of water weigh the most?
A. 2°C B. 4°C C. 8°C D. 90°C E. It would weigh the same at all these temperatures.
When a vapor condenses
A) the temperature of the substance increases. B) the temperature of the substance decreases. C) heat energy leaves the substance. D) heat energy enters the substance.