Earth's atmosphere gets most of its heat from the

A) Sun.
B) Earth's core.
C) both of these
D) neither of these


Answer: A

Physics & Space Science

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The following equation has been proposed for the heat transfer coefficient in natural convection from long vertical cylinders to air at atmospheric pressure:


Where Tf = the film temperature = 1/2 (Ts + T?) and Tf is in the range 0 to 200°C The corresponding equation in dimensionless form is

Compare the two equations, to determine those values of C, m and n in the second
equation that will give the same results as the first equation.
GIVEN
Empirical equations shown above
FIND
Values of C, m and n
ASSUMPTIONS
Air behaves as an ideal gas

Physics & Space Science

A mover slides a refrigerator 5 meters across a floor. If a force of 200 N was used, how much work was done?

Physics & Space Science

When you look into a pool of water, the depth looks less than it actually is because the light is dispersed

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

A circular coil of radius 5.0 cm and resistance 0.20 ? is placed in a uniform magnetic field perpendicular to the plane of the coil. The magnitude of the field changes with time according to B = 0.50e-20t T

What is the magnitude of the current induced in the coil at the time t = 2.0 s? A) 4.2 mA B) 2.6 mA C) 7.5 mA D) 1.3 mA E) 9.2 mA

Physics & Space Science