Inquiry Into Physics
8th Edition
ISBN: 9781305959422
Author: Ostdiek, Vern J.
Publisher: Cengage Learning,
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Chapter 3, Problem 28Q
To determine
To explain:
What can you conclude, if two cranes are lifting identical steel beams at the same time? One crane is putting out twice as much power as the other.
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I need help with this problem and an explanation for the solution described below. (University Physics 1: Application of Newton's laws, Work & Kinetic Energy, Potential Energy & Conservation of Energy)
A 65.0-kg file cabinet of is sliding down a rough ramp for a distance of 5.00 m as shown. The friction force on the box is 75.0 N. During this process, what is the work
done on the cabinet by its own weight, in Joule? Use g = 10.0 m/s². (Hint: What is the angle between the weight force and the displacement?)
Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit
is needed in your answer, it is already given in the question statement.
5.0 m
841
841
15.0°
Selected Answer:
Correct Answer:
Answer range +/- 1 (840 - 842)
pls answer #28
Analyze the problems carefully, then solve them. Be systematic when answering. Write the given, label them; the required; and all calculations pertinent to the problem. Express your numerical answers with the appropriate number of significant figures.
Chapter 3 Solutions
Inquiry Into Physics
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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
- A motorcycle can go from 0-60 mph in 3.5 sec. The mass of the motorcycle is 450 kg. (a) What is the kinetic energy of the bike when it is going 60 mph (in joules)? (b) What is the power of the engine to get from 0 to 60 mph in 3.5 sec? (c) Convert that power to horsepowerarrow_forwardA 50 kg bicyclist on a 10 kg bicycle speeds up from 5.0 m/s to 10 m/s. (a) What was the total kinetic energy before accelerating? (b) What was the total kinetic energy after accelerating? (c) How much work was done to increase the kinetic energy of the bicyclist?arrow_forwardA ski area claims that its lifts can move 48,000 people per hour. a.)If the average lift carries people about 240 m (ver-tically) higher, estimate the maximum total power needed (assume the mass of the average person to be 70 kg). Express your answer to two significant figures and include the appropriate units.arrow_forward
- You are driving to work at 60 mph and need to accelerate to 75 mph. How long will it take to reach this speed? Express this quantity in units of seconds. Assume the engine is rated at 140 hp and is 25% efficient. The combined vehicle and driver mass is 2970 lbm.arrow_forwardMay I know if I put the correct answer in the blanks? Correct me If I'm wrong. Thanks!arrow_forwardA 1,000-W motor powers a hoist used to lift cars at a service station. (a) How much time would it take to raise a 2,150-kg car 3 m? (b) If the original motor is replaced with one rated at 3,000 W, how long would it take to complete this task?arrow_forward
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- Consider the energy we use everyday in routine tasks, where that energy comes from, and where it goes. When you climb stairs you overcome the force of gravity to raise yourself to some height. It does not matter what the slope of the stairs are; the work done is against gravity which is always vertical so only the height counts. Take a typical human mass of 65 kg (roughly 143 lb of gravitational pull or weight) and a stairway up 3 stories which is about 9 meters. 1.What total work did you do? If you ate an original Krispy Kreme glazed donut afterward with 190 food calories, will you gain or lose as a result? 2.Walking on mostly level ground obviously consumes energy (50 food calories per kilometer). Why is this, even when no net work is done in the physics picture of force and distance?arrow_forwardYour job is to lift 30-kg crates a vertical distance of 0.90 m from the ground onto the bed of a truck. How many crates would you have to load onto the truck in 1 minute for the average power output you use to lift the crates to equal 0.50 hp?arrow_forwardYou are an athlete who masses 80 kg. When doing a pushup you lift a total of about 56 kg a distance of 0.6 meters. If a pushup takes 0.5 seconds, how much power do you generate? If you do 50 pushups, how long will that keep a 100 W light bulb on?arrow_forward
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