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

Physics & Space Science

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A mass 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

src="https://sciemce.com/media/4/d7a1e25d698e02ae34.png" class="w-image" />?



A. 3.98 down
B. 3.27
down
C. 3.15
down
D. 2.94
down
E. 1.64
down

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science

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?

Physics & Space Science