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Chapter 14: Q.13 (page 384)
What is the height of a water barometer at atmospheric
pressure?
The height is 10.34 m
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You and your friends are playing in the swimming pool with a beach ball. How much force would be needed to push the ball completely under water?
The tank shown in is completely filled with a liquid of density . The right face is not permanently attached to the tank but, instead, is held against a rubber seal by the tension in a spring. To prevent leakage, the spring must both pull with sufficient strength and prevent a torque from pushing the bottom of the right face out.
a. What minimum spring tension is needed?
b. If the spring has the minimum tension, at what height from the bottom must it be attached?
A syringe has an inner diameter of , a needle inner diameter of 0.25mm, and a plunger pad diameter (where you place your finger) of . A nurse uses the syringe to inject medicine into a patient whose blood pressure is .
A. What is the minimum force the nurse needs to apply to the syringe?
B. The nurse empties the syringe in . What is the flow speed of the medicine through the needle?
A 2000 N force stretches a wire by 1 mm. A second wire of the same material is twice as long and has twice the diameter. How much force is needed to stretch it by 1 mm? Explain
A 6.0 m * 12.0 m swimming pool slopes linearly from a 1.0 m depth at one end to a 3.0 m depth at the other. What is the mass of water in the pool?
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