Answer:
An infinite temperature
Explanation:
The efficiency of an engine is defined as:
where
is the temperature at which heat enters the engine
is the temperature of the environment, to which the engine exhausts heat
From the formula, we see that for an engine to be 100% efficient, the fraction
must be equal to zero. Since the value of is never zero (the temperature is expressed in Kelvin, and the temperature of the environment can never be exactly 0 K), the only possibility for that to occur is that the temperature at which heat enters the engine () is infinite, so that this fraction becomes zero and the efficiency becomes 1.
If the upward acceleration is equal to the acceleration due to gravity (), then the apparent weight would be zero, indicating that the passenger is experiencing weightlessness or is in a state of free fall.
When the box has left the rubber band but is still moving upward, the passenger's apparent weight would be less than their actual weight.
The apparent weight of an object is the force exerted on it by a supporting surface, which in this case is the floor of the box. It is equal to the normal force acting on the object.
As the box accelerates upward, there are two main forces acting on the passenger: the gravitational force (weight) pulling them downward and the normal force pushing them upward. The normal force is responsible for providing the upward acceleration to the passenger.
Since the passenger is moving upward, the normal force exerted by the floor must be less than their actual weight to create the net upward force necessary for upward acceleration. Therefore, the passenger's apparent weight is reduced.
The exact value of the apparent weight depends on the magnitude of the upward acceleration and the mass of the passenger. The apparent weight can be calculated using the equation:
Apparent weight = Actual weight - (Mass of passenger * Magnitude of upward acceleration)
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Answer:
A brush is a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft.