A water line of 2 inch diameter is buried horizontally 4 feet deep in earth. Estimate the heat loss per foot from the water line if water at 50ºF flows through the line and the outside temperature of the line is assumed to be 50ºF. The surface temperature of the earth is -20ºF
What will be an ideal response?
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Space-time will be flat if
a. the universe is expanding. b. the universe is accelerating. c. the average density of the universe is equal to the critical density. d. the universe is finite. e. the universe is homogeneous and isotropic.
Where does nuclear fusion occur in the Sun?
A) on the surface B) in a layer just below the surface C) deep in its core D) in a layer just above the visible surface E) all of the above
At the end of 1/2 second an apple freely falling from rest has a speed of
A) 1 m/s. B) 5 m/s. C) 10 m/s. D) more than 10 m/s.
You use a spring scale to suspend an object. The spring scale reads 7.84 N when the object is in air and 6.86 N when the object is immersed in water of density 1000 kg/m3. What is the density of the object?
A) 6000 kg/m3 B) 7000 kg/m3 C) 8000 kg/m3 D) 9000 kg/m3