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WITCHER [35]
2 years ago
14

Two condition required for work done​

Physics
1 answer:
mixas84 [53]2 years ago
5 0
1) There must be a force
2) There must be displacement
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What is the potential energy of a 3 kg rock sitting at the top of a 21 meter high cliff?
Svetradugi [14.3K]

Answer:

618.03 J

Explanation:

Potential energy can be calculate using the following formula.

PE=m*g*h

where m is the mass, g is the acceleration due to gravity and h is the height.

In this situation, we have a 3 kilogram rock on a 21 meter high cliff. Therefore, the mass is 3 kg and the height is 21 m.

On Earth, the acceleration due to gravity is 9.81 m/s^2.

m=3 kg

h=21 m

g=9.81 m/s^2

Substitute these values into the formula.

PE=3*9.81*21

Multiply all the numbers together

PE=63*9.81

PE=618.03

The potential energy is 618.03 kg m^2/s^2, or 618.03 Joules

3 0
3 years ago
What is the source of energy​
liberstina [14]
Fossil Fuels is the largest source for energy

Hope this is what you were asking :)
8 0
3 years ago
Earth's atmosphere contains only small amounts of carbon dioxide because
Mamont248 [21]
Of biogeochemical cycles

Because certain biogeochemical cycles take place to lessen these gases from forming since they are not beneficial for life if too much.
Thank you for your question. Please don't hesitate to ask in Brainly your queries. 
4 0
3 years ago
How does work affect energy between objects so it can cause a change in the form of energy?
mihalych1998 [28]

Answer:

Doing work' is a way of transferring energy from one object to another, energy is transferred when a force moves through a distance.

Explanation:  So more energy, more work done bc u transferred more energy to move the object and doing the work. and if you only use a little of energy, the work done also only a little.

5 0
3 years ago
Read 2 more answers
A 75-kg refrigerator is located on the 70th floor of a skyscraper (300meters a over the ground) What is the potential energy of
Nata [24]
Formula for potential energy is V=mgh, where m is mass in KG, g is earth acceleration (10 m/s^2), and h its height in meters. We know mass, acceleration is constant and also known, we know height also. Lets substitute
V=75*10*300=225000[J]=225[kJ] - its the answer
7 0
3 years ago
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