The mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle. On wheel and axle A,
2 answers:
Answer:
Wheel and axle B
Explanation:
It is given that the mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle.
Mathematically, it can be written as :
.................(1)
On wheel and axle A, the wheel and axle are very close in size while on wheel and axle B, the radius of the wheel is much greater than the radius of the axle.
From equation (1) it is clear that the mechanical advantage is directly proportional to the radius of wheel.
So, the mechanical advantage of wheel and axle B is greater.
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Explanation:
Since, it is mentioned the there occurs no change in the temperature. This also means that there will occur no change in thermal energy of the system.
Hence, = 0. And, as
= 0 then there will be no work involved. This means that total energy added to the house will return to the outside air as heat.
Therefore,
Q = -(19000 J + 2000 J)
= -21000 J
or, |Q| = 21000 J
Thus, we can conclude that the magnitude of the energy transfer between the house and the outside air is 21000 J.