As the skater descends his kinetic energy increases and his potential energy decreases. The total energy remains constant.
<h3>What is
energy?</h3>
Energy is the ability to do work. Types of energy are potential, kinetic, thermal and so on.
Potential energy is the energy stored in an object due to its position relative to another object. Kinetic energy is the energy due to the motion of an object.
As the skater descends his kinetic energy increases and his potential energy decreases. The total energy remains constant.
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The aluminum foil would reflect the most light !
According to Newton's Second Law of Motion, the force is directly proportional to mass and acceleration. However, mass and acceleration are inversely proportional to each other. It is best interpreted by the equation: F = ma. So, for the same amount of force, it would produce less acceleration on the greater mass of the helicopter.
Cost estimated is ₹[19/4]y/-.
Given :- Power=3kW , Time=1hr 35min
Now to convert this time completely into hours following steps can be adopted:- 1 min =1/60 hour, so 35min =35/60 hour
35min= 35/60 =7/12 hour
So total computed time = 1hr + [7/12]hr
computed time =19/12hr
Now since in the question there is no mention about cost , so let the cost be ₹y/unit.
Mathematically , Energy is the product of power and time , i.e.
E= Power x Computed time = 3 x 19/12 = 19/4 units.
Now the energy estimated is 19/4 units whose cost equivalent will be ₹[19/4]y/- , as cost of one unit energy is ₹y/- so cost of 19/4 energy units will be ₹[19/4]y/-.
Once the cost of one unit energy is known to us then just its value in the place of y and we will get the exact amount expended on the total energy consumption.
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