The concept of conservation of energy states that the total mechanical energy of aclosed system remains constant.If the only energy changes are in kinetic energy (, mv²) and gravitational potentialenergy (mgh). What is the total mechanical energy of the system?Total Mechanical Energymv² + mghOTotal Mechanical Energy = ;mv²Total Mechanical Energy = mghTotal Mechanical Energy = mv² +mgh

The concept of conservation of energy states that the total mechanical energy of a closed system…

Answered: The concept of conservation of energy…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Point Potential Energy Kinetic Energy Mechanical Energy A 2940 0 2940 B 1225 1600 2825 C 980 1806.25 2786.25 Calculate the ratio of the mechanical energy at B and mechanical energy at A (EB/EA) and (EC/EB). What do these ratios tell you about the conservation of energy?
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An object with mass m dropped from rest from height H, after travelling a distance and emerged horizontally from the bottom of the track with a velocity v and height of h. H The mechanical energy of the mass as it emerges from the bottom of the track. O mgH O mgh mgH + mv² Omgh + mv²
1. A roller-coaster car with a mass of 1200 kg starts at rest from a point 20 m above the ground. At point B, it is 9 m above the ground. [Express your answers in kilojoules (kJ).] a. What is the initial potential energy of the car? b. What is the potential energy at point B? c. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 40 000 J (40 kJ), what is the kinetic energy of the car at point B 2. The time required for one complete cycle of a mass oscillating at the end of a spring is 0.80 s. What is the frequency of oscillation?
You push on a box of 10?? with a force F = (20i −10j )N. It moves on a rough surface (uc=0.1) over 2m. Calculated... 1- the normal force module that acts on the body2- the work done by the force you exert3- the work done by the weight of the crate4- the work done by the force of friction
A bullet penetrates an object and its velocity is reduced by a half. What is the ratio between the initial kinetic energy of the bullet and kinetic energy when it leaves the object? KE, 1 O KE 2 KE; KE KE, = 1 O KEF KE, 1 • KE 4 %3! KE, = 4 KE a. you hold your bag as you walked along level ground: Yes v b. a briefcase is carried up stairs at constant speed: Yes C. a weightlifter lifts a 20Kg weight through a height of 1.2m: Yes d. a spring is stretched by Scm: Yes v
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The force required to compress a non-standard spring as a function of displacement from equilibrium x is given by the equation F(x) = ax2 - bx, where a = 65 N/m2, b = 4 N/m, and the positive x direction is in the compression direction of the spring.a. Write a general equation in terms of the given variable for the work required to compress this spring from equilibrium to any point xp.
How far must you stretch a spring with k = 1700 N/m to store 230 J of energy? Express your answer in meters. m As =
8
Practice 1. Which of the following represents the relationship between work, power, and time? Choices P = W/t W = P/t P = W×t t = W×P 2. A machine does 2500 J of work in 1 min. What is the power developed by the machine? Choices 21 W 42 W 150 W 2500 W 3. What is the average power output of a weightlifter who can lift 250 kg weights 2.0 m in 2.0 s? Choices 2.5 kW 5.0 × 102 W 4.9 kW 9.8 kW

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