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saw5 [17]
3 years ago
9

The average acceleration is the ratio of which of the following quantities?

Physics
1 answer:
Novay_Z [31]3 years ago
5 0
The answer will be : Δt
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If a person does 20 J of work on a book in 10 seconds, how powerful was the person while doing the work?
Korolek [52]

Answer:

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Explanation:

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The weight of an object _____.
denis23 [38]

The weight of an object is the force with which it is attracted to earth. The gravity of an object or body of an object is high on earth than at the atmosphere. It has an average of gravitational constant equal to 9.8066 or 9.8 meters per second. In truth, the acceleration of the object depend upon its location, the latitude and altitude, on earth.     

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8 0
3 years ago
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Determine the energy lost, due to friction, as an 8000 N car that skids to a stop, if its initial velocity was 12 m/s.
chubhunter [2.5K]

Answer:

<em>58,800Joules</em>

Explanation:

The energy lost is equal to the workdone by the car as it skids.

Workdone = Force * Distance

Given

Force = 8000N

Get the distance using the equation of motion

v² = u² - 2gS

0² = 12² - 2(9.8)S

-12² =  - 2(9.8)S

-144 = -19.6S

S = 144/19.6

S = 7.35m

Calculate the required energy

Workdone = 8000 * 7.35

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<em>Hence the energy lost due to friction is 58,800Joules</em>

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3 years ago
How are contact forces different from non-contact forces?
madam [21]
A non-contact force is a force which acts on an object without coming physically in contact with it. In contrast a contact force is a force which acts on an object coming physically in contact with it. ...
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