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(I) A 75.0 -kg firefighter climbs a flight of stairs 20.0$\mathrm { m }$ high. How much work is required?

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$1.47 \times 10^{4} \mathrm{J}$

Physics 101 Mechanics

Chapter 7

Work and Energy

Work

Kinetic Energy

Potential Energy

Energy Conservation

Simon Fraser University

Hope College

McMaster University

Lectures

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

03:47

In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest. The kinetic energy of a rotating object is the sum of the kinetic energies of the object's parts.

00:48

(I) A 65.0 -kg firefighter…

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A $75.0-\mathrm{kg}$ firef…

01:02

A 75.0-kilogram firefighte…

01:14

A 77.0 kg firefighter clim…

01:19

(I) A 75.0-kg firefighter …

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01:04

How much work is done when…

03:12

A 75.0 -kg person climbs s…

01:53

A 75.0-kg person climbs st…

01:16

05:13

How much work in total mus…

02:55

A worker on a scaffolding …

03:33

01:08

How much work is done in l…

7.3. We have a 75 kilogram firefighter climbing flight of steps that's 20 meters high, since we want to know how much work is required for this so but work. Since the force is going to be constant, it's going to be just his weight is the minimum amount of force required. The co sign Seda. Now the firefighter is moving by 20 meters. So the angle between the force of this placement at zero degrees so close and they did become one. Now, of course, the steps. You know, I like this, but we're just told what the change in height is. So whatever this distance is, doesn't matter. If we were told that he, you know, goes a distance of 20 meters of fighter steps, that's it, like, you know, 15 degrees or something. Then we have to put that in here. But that's not what we're doing. We just know the change in high and because gravity is a conservative for us, it doesn't matter what distance you go perpendicular to the direction of the force. And so the work required for this and the forces is wait again. So inviting GI. And so this is 1.47 times 10 to the fourth Jules

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