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3 years ago

How high above the ground is a 3 kg object that has 147 J (joules) of potential energy

Physics

1 answer:

Radda [10]3 years ago

6 0

Answer:

4.9949

Explanation:

M = 3 kg

P.E = 147 joules

G = 9.81 ms^-2

H = ?

P.E = MGH

147 = 3 x 9.81 x H

147 = 29.43H

147/29.43 = 29.43H/29.43

4.9949 = H

:. H = 4.9949

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A famous physics tale is about a rich man who was found dead. He was

anyanavicka [17]

<h2>Answer: C) He could have thrown the bag of money sideways, creating a horizontal reaction force on himself.</h2>

Explanation:

According to Newton's third law of motion, when two bodies interact between them, appear equal forces and opposite senses in each of them.

To understand it better:

Each time a body or object exerts a force on a second body or object, it (the second body) will exert a force of equal magnitude and direction but in the opposite direction on the first.

So, if the rich man had pushed the bag of money horizontally opposite of where he was, he could have saved himself.

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3 years ago

What does it mean to say that the forces acting on an object are balanced?

yan [13]

Hello,

Your correct answer would be A. "The forces occur as pairs of forces with equal magnitude and direction."

Sources: Google.

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3 years ago

A car slows down from 21 m/s to rest in a distance of 63m. Assuming the car has a constant acceleration, calculate the time it t

vladimir2022 [97]

Answer:

-3.5 m/s²

Explanation:

Initial Velocity = 21m /s
Final velocity = 0m/s
Distance = 63 m .
Acclⁿ = ?

We know that :-

$\longrightarrow$ Stopping distance = u²/2(-a)

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**Edits are welcomed**

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3 years ago

Facts about conolizing into mars?

Leto [7]

Answer:

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Explanation:

Mars also has a thin atmosphere. Because of this it has potential to host humans and other organic life. That makes Mars the best choice for thriving colony off the earth. The moon has also been proposed as the first location for human colonization but it not known to have air or water.

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3 years ago

A 70 kg object strikes the ground with 2500 J of KE after falling freely from rest. How far above the ground was the object when

Kitty [74]

Answer:

3.64 m

Explanation:

m = Mass of object = 70 kg

Kinetic energy of the object = 2500 J

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

h = Height from which the object is dropped

Kinetic energy is given by

$\dfrac{1}{2}mv^2=2500\\\Rightarrow v^2=\dfrac{2\times 2500}{70}$

From conservation of energy we get kinetic energy equal to potential energy.

$\dfrac{1}{2}mv^2=mgh\\\Rightarrow h=\dfrac{1}{2g}v^2\\\Rightarrow h=\dfrac{1}{2\times 9.81}\times \dfrac{2\times 2500}{70}\\\Rightarrow h=3.64\ \text{m}$

The object was released from a height of 3.64 m.

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3 years ago