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2 years ago

A body builder exerts 15 N of force over 3 m. How much work did she do?

Physics

2 answers:

tangare [24]2 years ago

4 0

Work done = force x distance

work done = 15 x 3

work done = 45J

eimsori [14]2 years ago

4 0

Answer:

$\boxed {\boxed {\sf 45 \ Joules}}$

Explanation:

Work is the force the causes the movement or displacement of an object. It is the product of force and displacement.

$W=Fd$

The force is 15 Newtons and the displacement is 3 meters.

F= 15 N
d= 3 m

Substitute the values into the formula.

$W= 15 \ N * 3 \ m$

Multiply.

$W= 45 \ N*m$

1 Newton meter is equal to 1 Joule, so our answer of 45 Newton meters is equal to 45 Joules.

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iris [78.8K]

Answer:

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Explanation:

We must make it clear that mass and weight are two different terms, the mass is always preserved that is to say this will never vary regardless of the location of the object. While weight is defined as the product of mass by gravitational acceleration.

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where:

m = mass = 60 [kg]

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But in order to calculate the weight of the body on the moon, we must know the gravitational acceleration of the moon. Performing a search of this value on the internet, we find that the moon's gravity is.

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jenyasd209 [6]

Explanation:

Given that,

Initial speed of a car, u = 60 km/h = 16.67 m/s

Acceleration, a = 2m/s²

Final speed, v = 120 km/h = 33.33 m/s

We need to find the distance traveled and the time taken to make the distance.

acceleration = rate of change of velocity

$a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{33.33 -16.67 }{2}\\\\t=8.33\ s$

let the distance be d.

$d=\dfrac{v^2-u^2}{2a}\\\\d=\frac{33.33^{2}-16.67^{2}}{2(2)}\\\\d=208.25\ m$

Hence, the distance traveled and the time taken to make the distance is 208.25 m and 8.33 seconds respectively.

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