Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 8, Problem 24AP
Make an order-of-magnitude estimate of your power out-put as you climb stairs. In your solution, state the physical quantities you take as data and the values you measure or estimate for them. Do you consider your peak power or your sustainable power?
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A factory has a ventilation system with a fan motor that has a 2½ horsepower motor. The fan must run continually, 24 hours a day, seven days a week. Assume a 30-day month and a cost of $0.16 per kilowatt-hour (kWh). What is the monthly cost to operate this system for the factory? (1 horsepower = 746 W)
Haliade-X 12 MW is one of the most powerful offshore wind turbines in the world and it will be installed in the New Jersey offshore area (Figure 1). Energy storage is a long-time problem for wind energy, because the period of wind power is not necessary at the peak of electricity demand. To match the power supply and demand, the generated energy has to be stored either in battery or other forms.
There is an idea to use the tower of the wind turbine as energy storage – sea water is pumped to the top of the tower when power generation is more than demand; and water is released to drive a generator at the base of the tower to supply energy when it is needed. Assume the turbine tower is 20 m below the sea bottom and the water depth is 30 m, and the tower is filled by sea water (density = 1030 kg/m3). Answer the questions below (make sure your answer is in both gauge pressure and absolute pressure form).
At the mean sea level, how much is the pressure between inside and outside the…
Chapter 8 Solutions
Physics for Scientists and Engineers
Ch. 8.1 - Consider a block sliding over a horizontal surface...Ch. 8.2 - A rock of mass m is dropped to the ground from a...Ch. 8.2 - Three identical balls are thrown from the top of a...Ch. 8.3 - You are traveling along a freeway at 65 mi/h. Your...Ch. 8 - Prob. 1PCh. 8 - A 20.0-kg cannonball is fired from a cannon with...Ch. 8 - A block of mass m = 5.00 kg is released from point...Ch. 8 - At 11:00 a.m, on September 7, 2001, more than one...Ch. 8 - A light, rigid rod is 77.0 cm long. Its top end is...Ch. 8 - Prob. 6P
Ch. 8 - A crate of mass 10.0 kg is pulled up a rough...Ch. 8 - A 40.0-kg box initially at rest is pushed 5.00 m...Ch. 8 - A smooth circular hoop with a radius of 0.500 m is...Ch. 8 - As shown in Figure P8.10, a green bead of mass 25...Ch. 8 - At time ti, the kinetic energy of a particle is...Ch. 8 - A 1.50-kg object is held 1.20 m above a relaxed...Ch. 8 - Prob. 13PCh. 8 - An 80.0-kg skydiver jumps out of a balloon at an...Ch. 8 - You have spent a long day skiing and are tired....Ch. 8 - The electric motor of a model train accelerates...Ch. 8 - An energy-efficient lightbulb, taking in 28.0 W of...Ch. 8 - An older-model car accelerates from 0 to speed v...Ch. 8 - Make an order-of-magnitude estimate of the power a...Ch. 8 - There is a 5K event coming up in your town. While...Ch. 8 - For saving energy, bicycling and walking are far...Ch. 8 - Energy is conventionally measured in Calories as...Ch. 8 - A block of mass m = 200 g is released from rest at...Ch. 8 - Make an order-of-magnitude estimate of your power...Ch. 8 - Prob. 25APCh. 8 - Review. As shown in Figure P8.26, a light string...Ch. 8 - Consider the blockspringsurface system in part (B)...Ch. 8 - Why is the following situation impossible? A...Ch. 8 - Jonathan is riding a bicycle and encounters a hill...Ch. 8 - Jonathan is riding a bicycle and encounters a hill...Ch. 8 - As the driver steps on the gas pedal, a car of...Ch. 8 - As it plows a parking lot, a snowplow pushes an...Ch. 8 - Heedless of danger, a child leaps onto a pile of...Ch. 8 - Review. Why is the following situation impossible?...Ch. 8 - A horizontal spring attached to a wall has a force...Ch. 8 - More than 2 300 years ago, the Greek teacher...Ch. 8 - Review. As a prank, someone has balanced a pumpkin...Ch. 8 - Review. Why is the following situation impossible?...Ch. 8 - An airplane of mass 1.50 104 kg is in level...Ch. 8 - A pendulum, comprising a light string of length L...Ch. 8 - A ball whirls around in a vertical circle at the...Ch. 8 - You are working in the distribution center of a...Ch. 8 - Prob. 43APCh. 8 - Starting from rest, a 64.0-kg person bungee jumps...Ch. 8 - Review. A uniform board of length L is sliding...Ch. 8 - A uniform chain of length 8.00 m initially lies...Ch. 8 - What If? Consider the roller coaster described in...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- As shown in Figure CQ33.6, a person pulls a vacuum cleaner at speed v across a horizontal floor, exerting on it a force of magnitude F directed upward at an angle with the horizontal. (a) At what rate is the person doing work on the cleaner? (b) State as completely as you can the analogy between power in this situation and in an electric circuit.arrow_forwardWhy do we need to be careful about work done on the system versus work done by the system in calculations?arrow_forward(a) What is the average power consumption in watts of an appliance that uses 5.00 kW h of energy per day? (b) How many joules of energy does this appliance consume in a year?arrow_forward
- Integrated Concepts (a) What force must be supplied by an elevator cable to produce an acceleration of 0.800 m/s2 against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? (b) How much work is done by the cable in lifting the elevator 20.0 m? (c) What is the final speed of the elevator if it starts from rest? (d) How much work went into thermal energy?arrow_forwarda) When she went away for the weekend, Celia left her TV on by mistake. The TV has a power rating of 200.0 W. She was away from 6 p.m. on Friday night until 9 p.m. on Sunday. How much energy did leaving the TV on use? Give your answer in kWh. b) If electricity costs 11.3 ¢per kWh, find out how much leaving the TV on costs her. I attached my answer below. I am just wondering if the time is 51h becasue it is 6:00pm on Friday to 9:00pm on Sunday or if it is 3h. My Answer: a) P=200.0W/1000kW=0.2kW Δt=51h ΔE= ? ΔE=PΔt =(0.2kW)(51h) =10.2kWh Therefore, leaving the TV on used 10.2kWh of energy. b) ΔE=10.2kWh rate=11.3¢/kWh Cost= ? Cost=(ΔE)(rate) =(10.2kWh)(11.3¢/kWh) =115.26¢ =$1.15 Therefore, leaving the TV on cost $1.15.arrow_forwardHow much power is needed to lift a 750 kg elephant 14.3 m in 30.0 seconds? Paragraph V B I U A/ Ev + varrow_forward
- Under what conditions can you apply the law of conservation of energy?arrow_forwardWhich of the following statements is/are true? Check all that apply. The SI unit of power is the horsepower. The SI unit of power is the watt. A person is limited in the total work he or she can do by the rate at which energy can be transformed. Power is the rate at which energy is transformed. Power is the rate at which work is done. A person is limited in the total work he or she can do only by the total energy required.arrow_forwardA) How much work is done lifting a 20 pound object from the ground to the top of a 30 foot building if the cable used weighs 1.5 pounds per foot? B) A bucket begins weighing 30 pounds, including the sand it holds. The bucket is to be lifted to the top of a 25 foot tall building by a rope of negligible weight. However, the bucket has a hole in it, and leaks 0.2 pounds of sand each foot it is lifted.Find the work done lifting the bucket to the top of the building.arrow_forward
- An airplane pilot fell 370 m after jumping from an aircraft without his parachute opening He landed in a snowbank, creating a crater 1.2 m deep, but survived with only minor injuries Assume that the pilot's mass was 80 kg and his speed at impact was 42 m/s . Model him as a particle Estimate the work done on him by air resistance as he fell.arrow_forwardHello, I need some help with these 2 homework problems. Watts / 1000 = Kilowatts You can calculate kilowatt-hours using this formula:Kilowatts x Time in Hours = Kilowatt-hours Use these formulas to determine the cost of each of these appliances of devices over a given period of time.Assume $0.20 per kWh utility cost 5. You decide to relax for the night by playing video games on your Playstation 3. You lose track of time and end up playing for 3 hours. The PS3 uses 197 watts/hour. You have an expensive plasma TV thatuses 339 watts/hour.________________________________________________________________________________ 6. Before going to bed for the night, you realize that you accidentally left the kitchen lights on all day (12hours). The lighting fixtures in the kitchen have a total of 4 incandescent bulbs, each of which uses 75watts/hour. ________________________________________________________________________________arrow_forwardWhich of these would have the greatest potential energy? A. A roller coaster at the top of a hill.B. A roller coaster half-way up the hill.C. A roller coaster half-way down the hill.D. A roller coaster at the bottom of the hill.arrow_forward
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