A body on the surface of the earth weighs 400 lb. The radius of the earth is about 4,000 miles. If this same body were placed on a 4,000 mile high tower, its weight would be 200 lb
Indicate whether the statement is true or false
F
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A Styrofoam ice chest is 2 cm thick. If the inside of the chest is at 0ºC and outside the chest it is 25ºC, estimate the heat transfer by conduction through the Styrofoam per unit area.
What will be an ideal response?
The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 × 10^-19 C)
a. 2.2 × 10^11 electrons c. 8.8 × 10^15 electrons b. 8.8 × 10^16 electrons d. 2.2 × 10^15 electrons
Most of the light we see coming from the Sun originates in the ____________________
Fill in the blank(s) with correct word
What is actually happening to the expansion of the Universe?
A.) It is continuing more or less unchanged. B.) It is slowing down. C.) It is accelerating. D.) The Universe is unchanging. E.) It is tearing apart.