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tatiyna
3 years ago
11

Which force best represents Fg?

Physics
1 answer:
givi [52]3 years ago
5 0

The weight of a barbell acting on a weightlifter in 80 N represents Fg.

<u>Explanation:</u>

Force exerted due to earth's gravity is represented as Fg. The gravitational pull is experienced by the mass of object has some force attached to by it which is called as force due to gravity.

The force is dependent upon the mass of the object experiencing the force. Hence the weight of a barbell acting on a weightlifter 80 N is the best example for Fg.

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A 87 kg man has a total mechanical energy of 1780 J .If he is swinging downward and is currently 1.4 m above the ground, what is
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6.4m/s

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   Kinetic energy  = \frac{1}{2}   m v²

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v is the velocity

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4 0
3 years ago
A girl is sitting in a sled sliding horizontally along some snow (there is friction present).
Naddika [18.5K]

Answer:

159 N

Explanation:

The force of friction is a resistive force that acts against an object in motion (or on the verge of moving).

There are two types of force of friction:

  • Force of static friction: it occurs when the object is still at rest
  • Force of kinetic friction: it occurs when the object is sliding on a surface and it is in motion

In this problem, we are in the 2nd situation, so we want to calculate the force of kinetic friction.

This force is given by:

F=\mu_k N

where

\mu_k is the coefficient of kinetic friction

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For the sled and the girl in this problem,

\mu_K = 0.25 is the coefficient of kinetic friction

N = 636 N is the normal force

So the force of friction is

F=(0.25)(636)=159 N

8 0
3 years ago
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