Principles of Physics: A Calculus-Based Text
5th Edition
ISBN: 9781133104261
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 7, Problem 63P
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?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A) Explain the Law of Conservation of Energy in the context of this
problem.
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…
a) 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.
Chapter 7 Solutions
Principles of Physics: A Calculus-Based Text
Ch. 7.1 - By what transfer mechanisms does energy enter and...Ch. 7.1 - Consider a block sliding over a horizontal surface...Ch. 7.2 - Prob. 7.3QQCh. 7.2 - Prob. 7.4QQCh. 7.4 - Prob. 7.5QQCh. 7 - You hold a slingshot at arms length, pull the...Ch. 7 - An athlete jumping vertically on a trampoline...Ch. 7 - Prob. 3OQCh. 7 - Two children stand on a platform at the top of a...Ch. 7 - Answer yes or no to each of the following...
Ch. 7 - A ball of clay falls freely to the hard floor. It...Ch. 7 - What average power is generated by a 70.0-kg...Ch. 7 - In a laboratory model of cars skidding to a stop,...Ch. 7 - At the bottom of an air track tilted at angle , a...Ch. 7 - One person drops a ball from the top of a building...Ch. 7 - Prob. 2CQCh. 7 - Does everything have energy? Give the reasoning...Ch. 7 - Prob. 4CQCh. 7 - Prob. 5CQCh. 7 - Prob. 6CQCh. 7 - A block is connected to a spring that is suspended...Ch. 7 - Consider the energy transfers and transformations...Ch. 7 - Prob. 9CQCh. 7 - Prob. 10CQCh. 7 - Prob. 1PCh. 7 - Prob. 2PCh. 7 - Review. A bead slides without friction around a...Ch. 7 - At 11:00 a.m, on September 7, 2001, more than one...Ch. 7 - A block of mass 0.250 kg is placed on top of a...Ch. 7 - A block of mass m = 5.00 kg is released from point...Ch. 7 - Two objects are connected by a light string...Ch. 7 - Prob. 8PCh. 7 - Prob. 9PCh. 7 - Prob. 10PCh. 7 - Prob. 11PCh. 7 - A crate of mass 10.0 kg is pulled up a rough...Ch. 7 - Prob. 13PCh. 7 - Prob. 14PCh. 7 - A block of mass m = 2.00 kg is attached to a...Ch. 7 - Prob. 16PCh. 7 - A smooth circular hoop with a radius of 0.500 m is...Ch. 7 - Prob. 18PCh. 7 - Prob. 19PCh. 7 - As shown in Figure P7.20, a green bead of mass 25...Ch. 7 - A 5.00-kg block is set into motion up an inclined...Ch. 7 - The coefficient of friction between the block of...Ch. 7 - Prob. 23PCh. 7 - Prob. 24PCh. 7 - Prob. 25PCh. 7 - Prob. 26PCh. 7 - A child of mass m starts from rest and slides...Ch. 7 - The electric motor of a model train accelerates...Ch. 7 - Prob. 29PCh. 7 - Prob. 30PCh. 7 - Prob. 31PCh. 7 - Sewage at a certain pumping station is raised...Ch. 7 - Prob. 33PCh. 7 - Prob. 34PCh. 7 - Prob. 35PCh. 7 - Prob. 36PCh. 7 - Prob. 37PCh. 7 - Prob. 38PCh. 7 - Prob. 39PCh. 7 - Prob. 40PCh. 7 - A loaded ore car has a mass of 950 kg and rolls on...Ch. 7 - Prob. 42PCh. 7 - A certain automobile engine delivers 2.24 104 W...Ch. 7 - Prob. 44PCh. 7 - A small block of mass m = 200 g is released from...Ch. 7 - Prob. 46PCh. 7 - Prob. 47PCh. 7 - Prob. 48PCh. 7 - Prob. 49PCh. 7 - Prob. 50PCh. 7 - Prob. 51PCh. 7 - Prob. 52PCh. 7 - Jonathan is riding a bicycle and encounters a hill...Ch. 7 - Prob. 54PCh. 7 - A horizontal spring attached to a wall has a force...Ch. 7 - Prob. 56PCh. 7 - Prob. 57PCh. 7 - Prob. 58PCh. 7 - Prob. 59PCh. 7 - Prob. 60PCh. 7 - Prob. 61PCh. 7 - Prob. 62PCh. 7 - Make an order-of-magnitude estimate of your power...Ch. 7 - Prob. 64PCh. 7 - Prob. 65PCh. 7 - Review. As a prank, someone has balanced a pumpkin...Ch. 7 - Review. The mass of a car is 1 500 kg. The shape...Ch. 7 - A 1.00-kg object slides to the right on a surface...Ch. 7 - A childs pogo stick (Fig. P7.69) stores energy in...Ch. 7 - Prob. 70PCh. 7 - Prob. 71PCh. 7 - Prob. 72PCh. 7 - A block of mass m1 = 20.0 kg is connected to a...Ch. 7 - Prob. 74PCh. 7 - Prob. 75PCh. 7 - Prob. 76PCh. 7 - Prob. 77PCh. 7 - Prob. 78PCh. 7 - A block of mass 0.500 kg is pushed against a...Ch. 7 - A pendulum, comprising a light string of length L...Ch. 7 - Jane, whose mass is 50.0 kg, needs to swing across...Ch. 7 - A roller-coaster car shown in Figure P7.82 is...Ch. 7 - Prob. 83P
Knowledge Booster
Learn more about
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_forwardPHYSICAL SCIENCE PLEASE SIMPLIFY 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)arrow_forwardUnder what conditions can you apply the law of conservation of energy?arrow_forward
- How 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_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
- Hello, 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_forwardAn 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_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
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-Hill
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
College Physics
Physics
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:OpenStax College
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Glencoe Physics: Principles and Problems, Student...
Physics
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Glencoe/McGraw-Hill
8.01x - Lect 11 - Work, Kinetic & Potential Energy, Gravitation, Conservative Forces; Author: Lectures by Walter Lewin. They will make you ♥ Physics.;https://www.youtube.com/watch?v=9gUdDM6LZGo;License: Standard YouTube License, CC-BY