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kkurt [141]
3 years ago
10

You do 200 joules of work against gravity when lifting your backpack up a flight of stairs that is 4 meters tall. What is the we

ight of your backpack in newtons?
Physics
1 answer:
kotegsom [21]3 years ago
8 0

Answer:

Correct answer:  F = 50 N  weight of backpack

Explanation:

Given:

W = 200 J    work against gravity

h = 4 m  

F = m g = ?

g = 10 m/s²

The work done is a measure of change in this case of potential energy

W = Δ Ep = m g h = F · h ⇒ F = W / h =

F = W / h = 200 / 4 = 50 N

F = 50 N

God is with you!!!

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A net force of 345 N accelerates a boy on a sled at 3.2 m/s^2 . What is combined mass of the sled
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Answer:

Mass, m = 26.54kg

Explanation:

Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.

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Fnet = Fapp + Fg

Where;

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  • Fapp is the applied force
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<u>Given the following data;</u>

Net force, Fnet = 345

Acceleration, a = 3.2m/s²

<u>To find mass;</u>

Fnet = Fapp + Fg

Fnet = ma + mg

Fnet = m(a+g)

m = Fnet/(a+g)

We know that acceleration due to gravity, g = 9.8m/s²

Substituting into the equation, we have;

m = 345/(3.2 + 9.8)

m = 345/13

Mass, m = 26.54kg

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2 years ago
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Answer:

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