Chapter 14: Q.9 (page 383)
The two identical beakers in FIGURE Q14.9 are filled to the same height with water. Beaker B has a plastic sphere floating in it. Which beaker, with all its contents, weighs more? Or are they equal? Explain.
Both beakers will weigh the same.
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Cylinders A and B have equal heights. Cylinder A is filled with helium gas at 1.0 atm pressure and 0 oC. The diameter of cylinder B is half that of cylinder A, and cylinder B is filled with glycerin. What is the ratio of the fluid mass in cylinder B to that in cylinder A?
A , steel cylinder floats in mercury. The axis of the cylinder is perpendicular to the surface. What length of steel is above the surface
Blocks a, b, and c in FIGURE Q14.7 have the same volume. Rank in order, from largest to smallest, the sizes of the buoyant forces Fa , Fb , and Fc on a, b, and c. Explain.
Disk brakes, such as those in your car, operate by using pressurized oil to push outward on a piston. The piston, in turn, presses brake pads against a spinning rotor or wheel, as seen in. Consider a industrial grinding wheel, in diameter, spinning at . The brake pads are actuated by diameter pistons, and they contact the wheel an average distance from the axis. If the coefficient of kinetic friction between the brake pad and the wheel is , what oil pressure is needed to stop the wheel in ?
An object has density ฯ.
a. Suppose each of the objectโs three dimensions is increased by a factor of 2 without changing the material of which the object is made. Will the density change? If so, by what factor? Explain.
b. Suppose each of the objectโs three dimensions is increased by a factor of 2 without changing the objectโs mass. Will the density change? If so, by what factor? Explain.
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