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3 years ago

Standing and holding a barbell that has a mass of 100kg at a height of 2m involves being done on the barbell to maintain

Physics

1 answer:

Basile [38]3 years ago

6 0

Answer:

1960Joules

Explanation:

Since we are not told what too find, we can as well find the Gravitational Potential Energy.

GPE = mass * acceleration due to gravity * height

GPE = 100*9.8 * 2

GPE = 980*2

GPE = 1960Joules

Hence the gravitational potential Energy is 1960Joules

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The stars in the model below are arrange by.... *

brilliants [131]

Answer:

where is the picture of star

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3 years ago

If you apply a 500N force to a car 200N car for 10 seconds but it doesn't move. How much work was done on the car?

djyliett [7]

Answer:

bbx

Explanation:

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3 0

2 years ago

7. Which of the following has the most total mechanical energy?

maria [59]

Answer:

An airplane flying

Explanation:

Both a bird and airplane fly, but the airplane is using more mechanical energy to run and power the plane, causing it to fly.

8 0

3 years ago

Calculate the number of free electrons per cubic meter for some hypothetical metal, assuming that there are 1.3 free electrons p

boyakko [2]

Answer:

The number of free electrons per cubic meter is $7.61\times 10^{28}\ m^{-3}$

Explanation:

It is given that,

The number of free electrons per cubic meter is, 1.3

Electrical conductivity of metal, $\sigma=6.8\times 10^7\ \Omega^{-1}m^{-1}$

Density of metal, $\rho=10.5\ g/cm^3$

Atomic weight, A = 107.87 g/mol

Let n is the number of free electrons per cubic meter such that,

$n=1.3\ N$

$n=1.3(\dfrac{\rho N_A}{A})$

Where

$\rho$ is the density of silver atom

$N_A$ is the Avogadro number

A is the atomic weight of silver

$n=1.3\times (\dfrac{10.5\ g/cm^3\times 6.02\times 10^{23}\ atoms/mol}{107.87\ g/mol})$

$n=7.61\times 10^{22}\ cm^{-3}$

$n=7.61\times 10^{28}\ m^{-3}$

Hence, this is the required solution.

6 0

3 years ago

Why does the momentum of a billiard ball rolling on a billiard table change?

stiv31 [10]

If the billiard ball is going at the constant speed and contains its mass then the momentum WONT be changing. But realistically you have external forces like friction and air resistance changing the velocity thus changing the momentum. In this case momentum is not conserved because you're introduction an external force.

8 0

3 years ago