Explanation:
Given parameters:
Mass of rock = 20kg
Height of cliff = 100m
Unknown:
Potential energy of the rock = ?
Kinetic energy before striking the ground = ?
Solution:
Potential energy is the energy due to the position of a body.
P.E = mgh
Kinetic energy is the energy due to the motion of a body
K.E = 
mv²
m = mass of body
g= acceleration due to gravity
h = height of the body
v = velocity of the rock
At the top of cliff the stone has no kinetic energy because it is as rest. Velocity at rest is zero.
P.E at the cliff top = mgh = 20 x 100 x 9.8 = 1960J = 19.6kJ
If the rock falls, before it comes to rest, based on the law of conservation of energy, the potential energy of the rock will be the same as the kinetic energy before it falls:
P.E + 0 = 0 + K.E
Therefore, the potential energy of the rock at rest is the same as the kinetic energy of the rock in flight before it comes to rest.
P.E = K.E = 1960J = 19.6kJ
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Kinetic energy brainly.com/question/6536722
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<span>All organisms need an
environment that will allow them to reproduce. Now, that can mean lots
of things. Humans for instance, need a place where they will find food,
water and sun light. They will also need shelter in order to be able to
protect their babies. But bacteria for example, they can live literally
anywhere. They live in places as acidic as our stomachs, as hot as
volcanoes, and as cold as ice in the poles.</span>
Explanation:
Given that,
Mass of a skier, m = 55 kg
The vertical distance between start and finish is 10 m.
(a) The potential energy of a skier is given by :
(b) When she reaches the bottom of the hill, the potential energy is converted to kinetic energy. So,
Hence, her potential energy is 5390 J and at the bottom of the hill she is moving with a speed of 14 m/s.
In dwelling unit basements, at least one receptacle outlet must be installed in addition to the laundry outlet.
What determines the minimum number of receptacles in a given dwelling?
The amount of wall space determines the minimum number of receptacle outlets in a given dwelling. Wall space is measured horizontally along the floor line. Although the Code spells out requirements for the minimum number of receptacles in a dwelling, it does not limit the number of receptacle outlets.
The receptacle definition of electrical receptacles are types of sockets or outlets that provide a location in a system where the wire can be inserted to provide electrical current.
What is the receptacle used for?
Electrical outlets, also known as receptacles, are sockets that are used to establish an electrical connection between an electronic device and power supply.
To learn more about receptacle outlet here
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Electric field due to a long wire is given by
here
r = 16 m
