How much energy is required to accelerate a golf ball of mass 0.046 kg initially at rest to a speed of 0.75c?
1 answer:
The required energy to accelerate the golf ball is .
- Energy, which is observable in the execution of labor as well as in the form of light and heat, is the quantitative quality that is transmitted to an object or to a physical phenomenon in physics.
- Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.
- The joule, which is defined as "the energy transmitted to an object by the effort of moving it a length of one metre against a force of one newton," is the standard measure for power in the International System of Units (SI).
Given that,
E=
=
= .
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Answer:
Explanation:
Given:
temperature of source reservoir,
temperature of sink reservoir,
energy absorbed from the source,
work done,
a.
<u>Now change in entropy of the surrounding:</u>
<em>Since heat engine is a device that absorbs heat from a high temperature reservoir and does some work giving out heat in the universe as the byproduct.</em>
b.
<u>We know Carnot efficiency is given as:</u>
<u>Now the Carnot work done:</u>
.......................(1)
c.
From eq. (1) we have the Carnot work, so the difference:
Now, we find:
Answer:
T = 76.39°C
Explanation:
given,
coffee cup temperature = 95°C
Room temperature= 20°C
expression
temperature at t = 0
T(0) = 95°C
temperature after half hour of cooling
t = 30 minutes
T(30) = 61.16° C
average of first half hour will be equal to
T = 76.39°C