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An apple is suspended a string and a spring in parallel. When the string is cut, the apple falls, and the spring stretches and contracts repeatedly as the apple bounces. Describe the energy conversions that occur during this process.

When the string is cut:Gravitational potential energy is converted to kinetic energy.Kinetic energy is converted to elastic potential energy.Elastic potential energy is converted to kinetic energy (and heat ...
DS
Answered by Dan S. • Physics tutor
3781 Views

Explain what terminal velocity means.

Consider an object in free fall through the atmosphere. Firstly, we need to consider the forces acting on the object. A force diagram will help here. Weight acts from the centre of mass of the object towards...
AM
Answered by Alex M. • Physics tutor
3668 Views

What is gravitational potential energy?

Gravitational potential energy is given by equation U = -GMm/r where G is gravitational constant, M and m are masses of two objects and r is the distance between these two masses. Now, we know that energy an...
NB
Answered by Natália B. • Physics tutor
2378 Views

What is temperature and why are Kelvins used?

Temperature is the macroscopic effect of the average kinetic energy of the subatomic particles that compose a material. Kelvins are therefore used because they are the only true scale that connects to this p...
GR
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An electric whisk in a bakery has two motors, each with an average power of 1500W. The whisk is used for 4 hours each day, 7 days a week. Electricity costs 18p per kilowatt-hour. Calculate the cost of the electricity used by the whisk in one week.

First, we must calculate the amount of time spent using the whisk in one week:4 x 7 = 28 hours a weekNext we calculate the power used; as the whisk has two motors, the average power used by the whole whisk i...
IS
Answered by Iqra S. • Physics tutor
3211 Views