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3 years ago

A crane raises a crate with a mass of 150 kg to a height of 20 m. Given that

Physics

1 answer:

Virty [35]3 years ago

7 0

Answer:

$\boxed {\boxed {\sf 29,400 \ Joules}}$

Explanation:

Gravitational potential energy is the energy an object possesses due to its position. It is the product of mass, height, and acceleration due to gravity.

$E_P= m \times g \times h$

The object has a mass of 150 kilograms and is raised to a height of 20 meters. Since this is on Earth, the acceleration due to gravity is 9.8 meters per square second.

m= 150 kg
g= 9.8 m/s²
h= 20 m

Substitute the values into the formula.

$E_p= 150 \ kg \times 9.8 \ m/s^2 \times 20 \ m$

Multiply the three numbers and their units together.

$E_p=1470 \ kg*m/s^2 \times 20 m$

$E_p=29400 \ kg*m^2/s^2$

Convert the units.

1 kilogram meter square per second squared (1 kg *m²/s²) is equal to 1 Joule (J). Our answer of 29,400 kg*m²/s² is equal to 29,400 Joules.

$E_p= 29,400 \ J$

The crate has 29,400 Joules of potential energy.

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An object has 1200 J of gravitational potential energy when it is dropped. Right when the object hits the ground how much kineti

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Answer:

The kinetic energy is 1200 J

Explanation:

The Principle of Conservation of energy states that "energy is neither created nor destroyed, it is transformed".

This means that energy can be transformed from one form to another, but the total amount of energy always remains constant, that is, the total energy is the same before and after each transformation.

The mechanical energy of a body or a physical system is the sum of its kinetic energy and the potential energy. According to the Principle of Conservation of Energy for mechanical energy, the total mechanical energy that a body possesses is constant at every instant of time.

Since mechanical energy is equal to the sum of kinetic energy and gravitational potential energy that a body possesses, the only way to stay constant is that:

when the kinetic energy increases the gravitational potential energy decreases,
when gravitational potential energy increases, kinetic energy decreases.

Due to the Principle of Conservation of Energy you can say that the gravitational potential energy is converted to kinetic energy. So Gravitational potential energy at the top = kinetic energy at the bottom

The kinetic energy is 1200 J

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2 years ago

How to solve for the coefficient of friction

astraxan [27]

Their are two coefficients of friction, static and kinetic, regardless, they have basically the same formula:

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Hope that helps!

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2 years ago

If the velocity and frequency of a wave are both doubled, how does the wavelength change?

Sindrei [870]

The wavelength will remain unchanged.

Explanation:

The velocity $v$ of a wave in terms of its wavelength $\lambda$ and frequency $\nu$ is

$v = \lambda\nu$ (1)

so if we double both the velocity and the frequency, the equation above becomes

$2v = \lambda(2\nu)$ (2)

Solving for the wavelength from Eqn(2), we get

$\lambda = \dfrac{2v}{2\nu} = \dfrac{v}{\nu}$

We would have gotten the same result had we used Eqn(1) instead.

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2 years ago

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A bowling ball of 35.2kg, generates 218 kg.m/s units of momentum. What is the velocity of the bowling ball?

brilliants [131]

Answer:

$6.18\:\mathrm{m/s}$

Explanation:

The momentum of an object is given by $p=mv$ .

Plugging in values, we have:

$218=35.2v,\\v=\frac{218}{35.2}=\fbox{$6.18\:\mathrm{m/s}$}$ .

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3 years ago

The Sun formed when a rotating cloud of gas and dust that was bigger than our present solar system contracted under the influenc

laiz [17]

Answer:

Angular momentum

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