## Online Physics Assignment Help - Hybrid Assignment: Fluids

PHYS 150 NAME:

Hybrid Assignment: Fluids

Due Date: Thursday, April 7, 2016, at the beginning of class

Use your text, Chapter 9, as a reference to help answer these questions

You may print this sheet and write your answers on it, or write your answers on separate pages (be sure to clearly label each question

& answer.)

1. A Simple Barometer

In the image below (Fig. 9.13 in your text), a column of mercury is supported by atmospheric pressure.

(a.) What is the height of the column of mercury (in millimeters) for standard atmospheric pressure?

(b.) If atmospheric pressure has increased to 110 kPa, what will be the new height of the mercury

column?

(c.) Suppose we construct a simple barometer using water instead of mercury. What would be the

height of the column of water at standard atmospheric pressure?

2. Measuring Pressure

In the image below, a manometer is shown (Fig. 9.10), which can be used to measure the pressure

exerted by the gas in the balloon.

(a.) Is the gas pressure in the balloon GREATER THAN, LESS THAN, OR EQUAL TO atmospheric

pressure? Explain how you can tell by using the diagram.

(b.) If each mark on the ruler is 1.0 cm, calculate the gas pressure in the balloon. (Hint: Begin by

measuring the difference in height of the mercury on the right side.)

3. Hydrostatic Pressure

(a.) An IV is connected to a patient's vein. The blood pressure in the vein has a gauge pressure of 12

mm Hg. At least how far above the vein must the IV bag be hung in order for fluid to flow into the vein?

Assume the fluid in the IV has the same density as blood.

(b.) Estimate the average blood pressure in a person's foot, if the foot is 1.37 m below the aorta, where

the average blood pressure is 104 mm Hg. For the purposes of this estimate, assume the blood isn't

flowing.

4. Pascal’s Principle

A hydraulic lift is lifting a car that weighs 12 kN. The area of the piston supporting the car is A, the area

of the other piston is a, and the ratio A/a is 100.0.

(a.) What force must be applied to the smaller piston (area a)?

(b.) How far must the small piston be pushed down to raise the car a distance of 1.0 cm? [Hint:

Consider the work to be done.]

1.

a) height of mercury for standard atmospheric pressure is 76 cm

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