College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Chapter 12, Problem 17CQ
If you lower the window on a car while moving, an empty plastic bag can sometimes fly out the window. Why does this happen?
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A golf club hits a golf ball and the golf ball’s flight reaches a maximum height of 5.48 m. Calculate the momentum of the golf ball at the maximum height if the mass of the golf ball is 0.459 kg.
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Superposition Theorem
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Chapter 12 Solutions
College Physics
Ch. 12 - What is the difference between flow rate and fluid...Ch. 12 - Many figures in the text show streamlines. Explain...Ch. 12 - Identify some substances that are incompressible...Ch. 12 - You can squirt water a considerably greater...Ch. 12 - Water is shot nearly vertically upward in a...Ch. 12 - Look back to Figure 12.4. Answer the following two...Ch. 12 - Give an example of entrainment not mentioned in...Ch. 12 - Many entrainment devices have a constriction,...Ch. 12 - Some chimney pipes have a T-shape, with a...Ch. 12 - Is there a limit to the height to which an...
Ch. 12 - Why is it preferable for airplanes to take off...Ch. 12 - Roofs are sometimes pushed off vertically during a...Ch. 12 - Why does a sailboat need a keel?Ch. 12 - It is dangerous to stand close to railroad tracks...Ch. 12 - Water pressure inside a hose nozzle can be less...Ch. 12 - A perfume bottle or atomizer sprays a fluid that...Ch. 12 - If you lower the window on a car while moving, an...Ch. 12 - Based on Bernoulli's equation, what are three...Ch. 12 - Water that has emerged from a hose into the...Ch. 12 - The old rubber boot shown in Figure 12.26 has two...Ch. 12 - Water pressure inside a hose nozzle can be less...Ch. 12 - Explain why the viscosity of a liquid decreases...Ch. 12 - When paddling a canoe upstream, it is wisest to...Ch. 12 - Why does flow decrease in your shower when someone...Ch. 12 - Plumbing usually includes air-filled tubes near...Ch. 12 - Doppler ultrasound can be used to the speed of...Ch. 12 - Sink drains often have a device such as that shown...Ch. 12 - Some ceiling fans have decorative wicker reeds on...Ch. 12 - What direction will a helium balloon move inside a...Ch. 12 - Will identical raindrops fall more rapidly in 5° C...Ch. 12 - If you took two marbles of different sizes, what...Ch. 12 - Why would you expect the rate of diffusion to...Ch. 12 - How are osmosis and dialysis similar? How do they...Ch. 12 - What is the average flow rate in cm3/S of gasoline...Ch. 12 - The heart of a resting adult pumps blood at a rate...Ch. 12 - Blood is pumped from the heart at a rate of 5.0...Ch. 12 - Blood is flowing through an artery of radius 2 mm...Ch. 12 - The Huka Falls on the Waikato River is one of New...Ch. 12 - A major artery with a cross-sectional area of 1.00...Ch. 12 - (a) As blood passes through the capillary bed in...Ch. 12 - The human circulation system has approximately...Ch. 12 - (a) Estimate the time it would take to fill a...Ch. 12 - The flow rate of blood through 2.00106 -m-radius...Ch. 12 - (a) What is the fluid speed in a fire hose with a...Ch. 12 - The main uptake air duct of a forced air gas...Ch. 12 - Water is moving at a velocity of 2.00 m/s through...Ch. 12 - Prove that the speed of an incompressible fluid...Ch. 12 - Water emerges straight down from a faucet with a...Ch. 12 - Unreasonable Results A mountain stream is 10.0 m...Ch. 12 - Verify that pressure has units of energy per unit...Ch. 12 - Suppose you have a wind speed gauge like the pitot...Ch. 12 - If the pressure reading of your pitot tube is 15.0...Ch. 12 - Calculate the maximum height to which water could...Ch. 12 - Every few years, winds in Boulder, Colorado,...Ch. 12 - (a) Calculate the approximate force on a square...Ch. 12 - (a) What is the pressure drop due to the Bernoulli...Ch. 12 - (a) Using Bernoulli's equation, show that the...Ch. 12 - Hoover Dam on the Colorado River is the highest...Ch. 12 - A frequently quoted rule of thumb in aircraft...Ch. 12 - The left ventricle of a resting adult's heart...Ch. 12 - A sump pump (used to drain water from the basement...Ch. 12 - (a) Calculate the retarding force due to the...Ch. 12 - What force is needed to pull one microscope slide...Ch. 12 - A glucose solution being administered with an IV...Ch. 12 - The pressure drop along a length of artery is 100...Ch. 12 - A small artery has a length of 1.1103 m and a...Ch. 12 - Fluid originally flows through a tube at a rate of...Ch. 12 - The arterioles (small arteries) leading to an...Ch. 12 - Angioplasty is a technique in which arteries...Ch. 12 - (a) Suppose a blood vessel's radius is decreased...Ch. 12 - A spherical particle falling at a terminal speed...Ch. 12 - Using the equation of the previous problem, find...Ch. 12 - A skydiver will reach a terminal velocity when the...Ch. 12 - A layer of oil 1.50 mm thick is placed between two...Ch. 12 - (a) Verify that a 19.0% decrease in laminar flow...Ch. 12 - Example 12.8 dealt with the flow of saline...Ch. 12 - When physicians diagnose arterial blockages, they...Ch. 12 - During a marathon race, a runner's blood flow...Ch. 12 - Water supplied to a house by a water main has a...Ch. 12 - An oil gusher shoots crude oil 25.0 m into the air...Ch. 12 - Concrete is pumped from a cement mixer to the...Ch. 12 - Construct Your Own Problem Consider a coronary...Ch. 12 - Consider a river that spreads out in a delta...Ch. 12 - Verify that the flow of oil is laminar (barely)...Ch. 12 - Show that the Reynolds number NRis unitless by...Ch. 12 - Calculate the Reynolds numbers for the flow of...Ch. 12 - A fire hose has an inside diameter of 6.40 cm....Ch. 12 - Concrete is pumped from a cement mixer to the...Ch. 12 - At what flow rate might turbulence begin to...Ch. 12 - What is the greatest average speed of blood flow...Ch. 12 - In Take-Home Experiment: Inhalation, we measured...Ch. 12 - Gasoline is piped underground from refineries to...Ch. 12 - Assuming that blood is an ideal fluid, calculate...Ch. 12 - Unreasonable Results A fairly large garden hose...Ch. 12 - You can smell perfume very shortly after opening...Ch. 12 - What is the ratio of the average distances that...Ch. 12 - Oxygen reaches the veinless cornea of the eye by...Ch. 12 - (a) Find the average time required for an oxygen...Ch. 12 - Suppose hydrogen and oxygen are diffusing through...
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- A rock is dropped from a height of 2.00 m. Determine the velocity of the rock just before it hits the ground. If the momentum of the rock just before hitting the ground is 14.0 kg m/s, what is the mass of the rock? Is the collision between the rock and the ground elastic or inelastic? Explain.arrow_forwardDescribe how the momentum of a single ball changes as it free falls from a height of approximately 1 m, collides with a hard floor, and rebounds.arrow_forward• Nature of Resistance Temperature-Resistance Relationship Ohm's Law, Energy and Power Kirchhoff's Law • • Maxwell's Mesh Analysis 1. The steel of the third rail of a railway system has a resistivity of 21.4 μ-cm. If its cross-sectional area is 8.2 in², calculate the resistance per mile of rail, neglecting the effect of joints between sections. (1 point) 2. An incandescent lamp has a tungsten filament whose resistance is 96 at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source, under which condition its temperature is 24°C. (Use do = 0.0045 02/°C for tungsten) (1 point) 3. For the circuit shown, find the following: 50 V 602 10 V 702 a. the value of resistor R. (1 point) b. the equivalent resistance with respect to the 50-V source. (1 point) 4. For the circuit shown, determine all the currents in each branch using Kirchhoff's Laws. (3 points) A 5V 2 В -ний C 4 6 VT ww F E 5. Use Maxwell's Mesh to find I, and VAB…arrow_forward
- For items 8-9, refer to the problem below. Find all the currents flowing in every resistor, power dissipation in every resistor and the total power of the circuit shown at the right using... 8. Kirchhoff's Laws (5 pts) 9. Maxwell's Mesh Analysis (5 pts) A 8 V 10 V B + 20 Ω 3Ω 202 wwww C wwww 202 + 50 www 12 Varrow_forward• Nature of Resistance Temperature-Resistance Relationship Ohm's Law, Energy and Power Kirchhoff's Law • Maxwell's Mesh Analysis 1. A coil of copper wire (p = 10.37 2-cmil/ft) has a length of 600 ft. What is the length of an aluminum conductor (p 17 cmil/ft), if its cross-sectional area and resistance are the same as those of the copper coil? (Hint: Look for conversion of inches to mils and square inches to square foot. Include it in your solution.) (1 pt) 2. The copper field winding of an electric machine has a resistance of 46 at temperature of 22°C. What will be its resistance at 75°C? (Use do = 0.00427 /°C for copper) (1 pt) 3. The resistivity of a copper rod 50 ft long and 0.25 inch in diameter is 1.76 μ at 20°C. What is its resistance at - 20°C? (1 pt) 4. When two resistors A and B are connected in series, the total resistance is 36 2. When connected in parallel, the total resistance is 8 Q. What is the ratio of the resistance RA to resistance RB? Assume RA < RB. (1 pt) 5. The…arrow_forward2. Two equally strong individuals, wearing exactly the same shoes decide to do a tug of war. The only difference is individual A is 2.5 meters tall and individual B is 1.5 meter tall. Who is more likely to win the tug of war?arrow_forward
- 6. A car drives at steady speed around a perfectly circular track. (a) The car's acceleration is zero. (b) The net force on the car is zero. (c) Both the acceleration and net force on the car point outward. (d) Both the acceleration and net force on the car point inward. (e) If there is no friction, the acceleration is outward.arrow_forward9. A spring has a force constant of 100 N/m and an unstretched length of 0.07 m. One end is attached to a post that is free to rotate in the center of a smooth. table, as shown in the top view in the figure below. The other end is attached to a 1kg disc moving in uniform circular motion on the table, which stretches the spring by 0.03 m. Friction is negligible. What is the centripetal force on the disc? Top View (a) 0.3 N (b) 3.0 N (c) 10 N (d) 300 N (e) 1000 Narrow_forward4. A child has a ball on the end of a cord, and whirls the ball in a vertical circle. Assuming the speed of the ball is constant (an approximation), when would the tension in the cord be greatest? (a) At the top of the circle. (b) At the bottom of the circle. (c) A little after the bottom of the circle when the ball is climbing. (d) A little before the bottom of the circle when the ball is descending quickly. (e) Nowhere; the cord is pulled the same amount at all points.arrow_forward
- 3. In a rotating vertical cylinder (Rotor-ride) a rider finds herself pressed with her back to the rotating wall. Which is the correct free-body diagram for her? (a) (b) (c) (d) (e)arrow_forward8. A roller coaster rounds the bottom of a circular loop at a nearly constant speed. At this point the net force on the coaster cart is (a) zero. (b) directed upward. (c) directed downward. (d) Cannot tell without knowing the exact speed.arrow_forward5. While driving fast around a sharp right turn, you find yourself pressing against the left car door. What is happening? (a) Centrifugal force is pushing you into the door. (b) The door is exerting a rightward force on you. (c) Both of the above. (d) Neither of the above.arrow_forward
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