Two inflated balloons are of identical size and shape, but one is filled with hydrogen, the other helium. Which has the larger buoyant force on it?
a. neither—the buoyant forces must be equal
b. the helium balloon
c. the hydrogen balloon
d. It can't be determined.
a
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An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its kinetic energy is a minimum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) at none of the above points
Water at 600F flows through a copper tube of 1 inch inside diameter (ID) at aspproximately 1 ft/s. Determine the heat transfer to the water per foot of tube length if the inside surface temperature of the tube is 180ºF.
What will be an ideal response?
Molar Specific Heats: A rigid container is filled with 4.0 mol of air with CV = 2.5R. How much does the internal (thermal) energy of the air change if its temperature rises from 18°C to 448°C? (R = 8.31 J/mol ? K)
A. 35,800 J B. 430 J C. 3580 J D. 8940 J
Two massive objects are fixed in position. A third object is placed directly between the first two at the position at which the total gravitational force on the third object due to the two massive objects is zero
The object is displaced slightly toward one of the two massive objects, the total gravitational force on the third object is now A) zero. B) in a direction which depends on which of the massive objects has a greater mass. C) in the same direction the object is displaced. D) in the opposite direction to the displacement of the object. E) perpendicular to the displacement of the object.