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Elza [17]
2 years ago
6

Children are sled riding on a hill One little girl pulls her sled back up the hill and does 379.5 joules of work while pulling i

t back up the 173 meter hill What amount of force did she exert on the sled?
Physics
1 answer:
Serggg [28]2 years ago
4 0

Answer:

2.2N

Explanation:

Given parameters:

Work done  = 379.5J

Height  = 173m

Unknown:

Amount of force exerted on the sled  = ?

Solution:

The amount of force she exerted on the sled is the same as her weight.

Work done is the force applied to move a body through a distance.

      Work done  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

     mg  = weight;

        Work done  = weight x h

           379.5 = weight  x  173

           weight  = \frac{379.5}{173}   = 2.2N

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Answer:

Final temperature, T2 = 314.9 Kelvin

Explanation:

Given the following data:

Mass = 0.9kg

Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K

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But, dt = T2 - T1

T2 = dt + T1

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T2 = 314.9 Kelvin

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