Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Question
Chapter 3, Problem 16P
To determine
The potential energy of the antenna.
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A microwave antenna with a mass of 80 kg sits atop a tower that is 50 m tall. What is the antennas potential energy?
In a particular city, electrical energy costs $0.13 per kilowatt-hour. (Round your answers, in dollars, to at least two decimal places.)
(a) How much does it cost to operate an old-style incandescent 40.0-W light bulb continuously for 24 hours?
How is power related to energy? Be sure to find an energy in units of kilowatt-hours. Then, use it along with the cost rate in dollars per kilowatt-hour to find a cost
in dollars.
(b) A modern LED light bulb that emits as much visible light as a 40.0-W incandescent only draws 4.50 W of power. How much does it cost to operate this bulb for
24 hours?
$
(c) A particular electric oven requires a potential difference of 220 V and draws 20.0 A of current when operating. How much does it cost to operate the oven for
4.80 hours?
2$
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A standard computer has a power supply of 550 W, and many people just leave their computer on all thetime. Calculate the amount of money it costs to run a 550 W computer for 24 h, if electricity costs 7.5¢/kWh.
Chapter 3 Solutions
Inquiry into Physics
Ch. 3 - Distinguish between what a physicist and a...Ch. 3 - If the population in a certain country was...Ch. 3 - Describe the basic features of the “lighthouse”...Ch. 3 - Prob. 2AACh. 3 - Prob. 1PIPCh. 3 - Prob. 1MIOCh. 3 - Repeat Exercise I for Section 3.2 on linear...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...
Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 8QCh. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 10QCh. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 12QCh. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 16QCh. 3 - Prob. 17QCh. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 21QCh. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 25QCh. 3 - (Indicates a review question, which means it...Ch. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 28QCh. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 30QCh. 3 - Prob. 31QCh. 3 - Prob. 32QCh. 3 - (Indicates a review question, which means it...Ch. 3 - Prob. 34QCh. 3 - (¦ Indicates a review question, which means it...Ch. 3 - A sprinter with a mass of 65 kg reaches a speed of...Ch. 3 - Which has the larger linear momentum: a 2,000-kg...Ch. 3 - In Section 2.4, we computed the force needed to...Ch. 3 - A runner with a mass of 80 kg accelerates from 0...Ch. 3 - In Section 1.4, we considered the collision of a...Ch. 3 - A basketball with a mass of 0.62 kg falls...Ch. 3 - A pitcher throws a 0.5-kg ball of clay at a 6-kg...Ch. 3 - A 3,000-kg truck runs into the rear of a 1,000-kg...Ch. 3 - A 50-kg boy on roller skates moves with a speed of...Ch. 3 - . Two persons on ice skates stand face to face and...Ch. 3 - . A loaded gun is dropped on a frozen lake. The...Ch. 3 - . A running back with a mass of 80 kg and a speed...Ch. 3 - . A motorist runs out of gas on a level road 200 m...Ch. 3 - . In Figure 3.10, the rock weighs 100 lb and is...Ch. 3 - . A weight lifter raises a 100-kg barbell to a...Ch. 3 - Prob. 16PCh. 3 - . A personal watercraft and rider have a combined...Ch. 3 - As it orbits Earth, the 11,000-kg Hubble Space...Ch. 3 - . The kinetic energy of a motorcycle and rider is...Ch. 3 - . In compressing the spring in a toy dart gun,...Ch. 3 - . An archer using a simple bow exerts a force of...Ch. 3 - A worker at the top of a 629-m-tall television...Ch. 3 - . A 25-kg child uses a pogo stick to bounce up and...Ch. 3 - . A student drops a water balloon out of a dorm...Ch. 3 - . A child on a swing has a speed of 7.7 m/s at the...Ch. 3 - . The cliff divers at Acapulco, Mexico, jump off a...Ch. 3 - . At NASA's Zero Gravity Research Facility in...Ch. 3 - . The fastest that a human has run is about 12...Ch. 3 - . A bicycle and rider going 10 m/s approach a...Ch. 3 - . In January 2003, an 18-year-old student gained a...Ch. 3 - The ceiling of an arena is 20 m above the floor....Ch. 3 - . Compute how much kinetic energy was “lost” in...Ch. 3 - Compute how much kinetic energy was “lost” in the...Ch. 3 - . A 1,000-W motor powers a hoist used to lift cars...Ch. 3 - . How long does it take a worker producing 200 W...Ch. 3 - . An elevator is able to raise 1,000 kg to a...Ch. 3 - . A particular hydraulic pile driver uses a ram...Ch. 3 - . A compact car can climb a hill in 10 s. The top...Ch. 3 - . In the annual Empire State Building race,...Ch. 3 - . It takes 100 minutes for a middle-aged physics...Ch. 3 - . Two small 0.25-kg masses are attached to...Ch. 3 - Rank the following three collisions in terms of...Ch. 3 - A bullet with a mass of 0.01 kg is tired...Ch. 3 - In a head-on, inelastic collision, a 4,000-kg...Ch. 3 - Prob. 4CCh. 3 - Prob. 5CCh. 3 - The "shot" used in the shot-put event is a metal...Ch. 3 - Prob. 7CCh. 3 - Prob. 8CCh. 3 - A series of five 0.1-kg spheres are arrayed along...
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- Jenny is out trimming her hedges with a hedgetrimmer that has a 1500W power rating. If it takes her a half hour to finish her chores and the cost of electricity is 12cents/kWh, how much will it cost to make the front of her house beautiful?arrow_forward3. A 50 kg gorilla is sitting on the limb of a tree 4 meters above the ground. What is the potential energy of the gorilla? Answer:arrow_forwardWhat is the potential energy of a 10 kilogram cube 500 meters above the ground?arrow_forward
- If you have an average of 6.5 hours of online class per day for 204 days of school per year, how many kilowatt-hours are consumed and what is the annual cost of using your laptop if the estimated cost per hour of a laptopis P0.75 / kWh? (base this, a regular laptop uses 90 Watts.)arrow_forwardIf a 0.02 kg bullet is traveling 2 meters off the ground, what would the potential energy of the bullet be?arrow_forwardAt 15 cents is a kilo Watt per hour. What does it cost to operate 1200 W for 1 hour?arrow_forward
- 3. A rock weighs 700 g and has a potential energy of 1 500 J. What height is it found at? to search acer TravelMate Barrow_forwardA school is paying $0.12/kWh for electric power. To reduce its power bill,the school installs a wind turbine with a rated power of 30 kW.If the turbine operates 2200 hours per year at the rated power, determinethe amount of electric power generated by the wind turbine and the moneysaved by the school per year.arrow_forwardHow much potential energy due to gravity would a person have if he is standing on top of the building that is 1000 cm high? Assume that he has a mass of 50 kg.arrow_forward
- 5. An electron strikes the screen of a cathode-ray tube with a velocity of 10 m/s. Compute its kinetic energy in joules. The mass of an electron is 9.11 x 10 -³¹ kg. 6. A body of mass 2 kg. is initially at rest on a horizontal frictionless plane. It is the pulled 4 meters by a horizontal force of magnitude 25 N. Use the work-energy relation to find its final speed. 7. In problem 6, suppose the body has an initial velocity of 10m/s and is then pulled 4 meters by a force of magnitude 25 N in the direction of the initial velocity, what is its final velocity?arrow_forward7. An overhead tank containing 1,500 L of water is placed on top of the roof of a building. The height of the building from the ground to the roof is 10 m. What is the potential energy of the water with respect the ground?arrow_forwardA box of pizza is placed at the tabletop, 0.74 meters high from the floor which is inside a 3-meter-high room. Suppose the pizza weighs 1 kilograms, what is the potential energy of the box of pizza relative to the floor in joules? Round your answer to the nearest hundredth.arrow_forward
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