When a suction cup sticks to a wall it is Question options:1pushed to the wall by the atmosphere.2pulled to the wall by the vacuum.3neither of these4both of these

When the suction cup is pressed against the wall, air leaves the gap between the wall and the cup…

Answered: When a suction cup sticks to a wall it…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter11: Fluid Statics

Section: Chapter Questions

Problem 20CQ: Why is it difficult to swim under water in the Great Salt Lake?

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Water supplied to a house by a water main has a pressure of 3.00105N/m2 early on a summer day when neighborhood use is low. This pressure produces a flow of 20.0 L/min through a garden hose. Later in the day, pressure at the exit of the water main and entrance to the house drops, and a flow of only 8.00 L/min is obtained through the same hose. (a) What pressure is now being supplied to the house, assuming resistance is constant? (b) By what factor did the flow rate be water main increase in order to cause this decrease in delivered pressure? The pressure at the entrance of the water main is 5.00105N/m2 , and the original rate was 200 L/min. (c) How many more users are there, assuming each would consume 20.0 L/min in be morning?
A submarine is stranded on the bottom of the ocean with its hatch 25.0 m below surface. Calculate force needed to open the hatch from the inside, given it is circular and 0.450 m in diameter. Air pressure inside the submarine is 1.00 atm.
Concrete is pumped from a cement mixer to the place it is being lad, instead of being carried wheelbarrows. The flow rate is 200 L/min through a 50.0-m-long, 8.00-cm-diameter hose, and he pressure it the pump is 8.00106 N/m2. (a) Calculate the resistance of the hose. (b) What is the viscosity of the concrete, assuming the flow is laminar? (c) How much power is being supplied, assuming the point of use is at the same level as the pump? You may neglect the power supplied to increase be concrete's velocity.
Look back to figure 14.29. Answer the following two question. Why is poless than atmospheric? Why is pogreater than pi?
Will the same ship float higher in salt water than in freshwater? Explain you answer.
A 2.50-kg steel gasoline can holds 20.0 L of gasoline when full. What is the average density of gas can, taking into account be volume occupied by steel as well as by gasoline?
You can squirt water from a garden hose a considerably greater distance by partially covering the opening with your thumb. Explain this works.
Some chimney pipes have a T-shape, with a crosspiece on top that helps draw up gases whenever there is even a slight breeze. Explain how this works in terms of Bernoulli’s principle.
Why is it difficult to swim under water in the Great Salt Lake?
More force is required to pull the plug in a full bathtub than when it is empty. Does this contradict Archimedes' principle? Explain your answer.
A fire hose has an inside diameter of 6.40 cm. Suppose such a hose caries a flow of 40.0 L/s starting at a gauge pressure of 1.62106 N/m2. The hose goes 10.0 m up a ladder to a nozzle having an inside diameter of 3.00 cm. Calculate the Reynolds numbers for flow in the fire hose and nozzle to show that flow in each must be turbulent.
The tip of a nail exerts tremendous pressure when hit by a hammer because it exerts a large force over a small area. What force must be exerted a nail a circular tip of 1.00-mm diameter to create a pressure of 3.00109 N/m2? (This pressure is possible because the hammer striking the nail is brought to rest in such a short distance.)

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1	pushed to the wall by the atmosphere.
2	pulled to the wall by the vacuum.
3	neither of these
4	both of these

When a suction cup sticks to a wall it is Question options: 1 pushed to the wall by the atmosphere. 2 pulled to the wall by the vacuum. 3 neither of these 4 both of these