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
a. True
b. False
Indicate whether the statement is true or false
False
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An airplane travels from east to west with a velocity 450 mi/hr relative to the Earth. At the same time the wind is blowing from west to east at 50 mi/hr. What is the speed of the plane with respect to the air?
A. 500 mi/hr B. More than 400 mi/hr but less than 450 mi/hr C. 400 mi/hr D. 450 mi/hr E. More than 450 mi/hr but less than 500 mi/hr
An object 20-cm high is placed 50.0 cm in front of a lens whose focal length is 5.00 cm. Where will the image be located (in cm)?
a. 5.13 b. 5.56 c. 5.72 d. 5.93 e. 4.55
What is the coefficient of performance of a Carnot heat pump used to remove heat from ice at 0.0°C and add heat to a room at 20.0°C?
A) 14.7 B) 1.00 C) 0.00 D) 20.0 E) 293
In general, the greater the mass of the protostar, the ________ it contracts to the main sequence
Fill in the blank(s) with correct word