1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ierofanga [76]
3 years ago
15

A crane uses a block and tackle to lift a 2200N flagstone to a height of 25m

Physics
1 answer:
Cloud [144]3 years ago
6 0

Remember the headline:  ENERGY IS NEVER CREATED OR DESTROYED

The amount of energy before and after are always equal.  All we ever do with energy is move it around from one place to another.

a). A crane can't create energy.  Lifting the same rock in 20 different ways always takes the <u><em>same amount of work</em></u>.  It doesn't matter whether one person picks the rock straight up, or 50 people get around it and lift it, or roll it up a ramp, or lift it with 16 pulleys and a mile of rope, or use a giant steam crane.

You want to lift a 2200N weight up 25m, you're going to have to supply

(2200N) x (25m) = <em>55,000 Joules</em> of work.

c). YOU put out 55,000 Joules of energy.  It had to GO someplace. Where is it now ? ===>  It's the potential energy the rock has now, from being 25m higher than it was before.  That <em>55,000 Joules</em> is NOW the potential energy  of the rock.

No energy was created or destroyed.  It just got moved around.  

55,000 Joules of energy began as nuclear energy in the core of the sun. Solar radiation carried it to the Earth. Plants absorbed it, and stored it as chemical energy.  You ... or a cow that you ate later ... ate the plants and took the chemical energy.  One way or the other, the chemical energy got stored in your blood and fat.  When you needed to put it out somewhere, you moved it into your muscles, and they converted it into mechanical energy.  Then you used the mechanical energy to exert forces.  Today, you used the original 55,000 joules to lift the flagstone, and NOW that energy is in the flagstone, 25 meters up off the ground !

You might be interested in
The ability to do work or cause change is called
ipn [44]

Answer:

Energy

Explanation:

PLAESE MARK AS BRAINLIEST RATE 5 STARS AND THANK ME.

HOPE THIS HELPS

3 0
3 years ago
Most chemical reactions can be divided into how many main groups?
tatyana61 [14]
There is synthesis
decomposition
double displacement
single displacement
combustion
metathesis
so i guess you could say 6
5 0
3 years ago
How density of substance change with change in temperature?
Anna71 [15]

The answer is above but I don't know if it's correct.

7 0
2 years ago
What is the characteristic that allows an object to have kinetic energy?
Shtirlitz [24]
Kinetic energy is movement, thus movement would be a characteristic that allows an object to have kinetic energy
6 0
2 years ago
In an experiment, a researcher can make claims about causation
Yakvenalex [24]
<span>In an experiment, a researcher can make claims about causation if the independent variable changes because of changes made to the dependent variable. Causation works on cause and effect, so the changed independent variable is the cause and the changed dependent variable is the effect. In an experiment the independent variable is changed to determine the dependent variables value, so the two are directly related.</span>
8 0
3 years ago
Other questions:
  • If a 2.00kg ball is thrown straight upward and its maximum height is 25.51. what is the value of KE?
    13·1 answer
  • A 6.0-kg box slides down an inclined plane that slopes 39° to the horizontal. The box accelerates at a rate of 3.1 m/s^2. What i
    15·1 answer
  • Select the correct answer.
    5·1 answer
  • How are force and weight related to each other
    9·1 answer
  • Answer:<br><br> A. 2y(x³ + 9x - 5x² - 45)<br><br> B. 2y(x² + 9)(x - 5)
    6·1 answer
  • What is the main idea of quantum psychics?
    8·1 answer
  • Un móvil que viaja a 40 m/s aplica los frenos y desacelera a razón de -0,25 m/seg 2 , ¿Cuánto tiempo le llevo
    11·1 answer
  • Select the correct answer.
    11·1 answer
  • What is elastic potential energy and give and a example
    12·1 answer
  • Michelle walked 217 meters in 2 minutes ,55 seconds what is her speed
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!