Answer:
Change in potential energy = 7350 Joules
Explanation:
It is given that,
Side of cube, a = 0.5 m
Density of cube, ![d=2\times 10^3\ kg/m^3](https://tex.z-dn.net/?f=d%3D2%5Ctimes%2010%5E3%5C%20kg%2Fm%5E3)
The cube is lifted vertically by a crane to a height of 3 m
We know that, density ![d=\dfrac{m}{V}](https://tex.z-dn.net/?f=d%3D%5Cdfrac%7Bm%7D%7BV%7D)
So, m = d × V (V = volume of cube = a³)
![m=2\times 10^3\ kg/m^3\times (0.5\ m)^3](https://tex.z-dn.net/?f=m%3D2%5Ctimes%2010%5E3%5C%20kg%2Fm%5E3%5Ctimes%20%280.5%5C%20m%29%5E3)
m = 250 kg
We have to find the change in potential energy of the cube. At ground level, the potential energy is equal to 0.
Potential energy at height h is given by :
![PE=mgh](https://tex.z-dn.net/?f=PE%3Dmgh)
PE = 250 kg × 9.8 m/s² ×3 m
PE = 7350 Joules
So, change in potential energy of the cube is 7350 Joules.
A wave created by shaking a rope up and down is called a:
(According to me and certified experts) Transverse wave.
If this helps, then please give Brainliest!
Answer:
-48 N
Explanation:
mass of door (m) = 4 kg
acceleration of the door = 12 m/s^{2}
force exerted by the person = 48 N
From Newton's third law of motion, action and reaction are equal but opposite. Therefore the force exerted on the door by the person which is 48 N will be the same as the force exerted on the person by the door but opposite in its direction, and this would be - 48 N
The force that prevents motion when the surfaces of two objects come into contact is known as friction. Friction decreases a machine's mechanical advantage, or, to put it another way, reduces the output to input ratio.
<h3>How can I figure out the frictional force?</h3>
The resistive force of friction (Fr) divided by the normal or perpendicular force (N) pushing the objects together yields the coefficient of friction (fr), which is a numerical value.
The formula fr = Fr/N serves as a representation of it.
Therefore, 100N of force is needed to move an item with a mass of 50 kg.
It will accelerate by 10 m/s2.
If a substance's mass does not change over time, friction cannot affect it. Instead, friction can be affected in a variety of ways by an object's mass.
To Learn more About Friction, Refer:
brainly.com/question/24338873
#SPJ13
Explanation:
Below is an attachment containing the solution.