What temperature is required to transfer waste heat to the environment for a heat engine to be 100 percent efficient?

Answers

Answer 1
Answer: This can be seen as a trick question because heat engines can typically never be 100 percent efficient. This is due to the presence of inefficiencies such as friction and heat loss to the environment. Even the best heat engines can only go up to around 50% efficiency.
Answer 2
Answer:

Answer:

An infinite temperature

Explanation:

The efficiency of an engine is defined as:

\eta=1 -(T_C)/(T_H)

where

T_H is the temperature at which heat enters the engine

T_C 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

(T_C)/(T_H)

must be equal to zero. Since the value of T_C 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 (T_H) is infinite, so that this fraction becomes zero and the efficiency becomes 1.


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What types of germs are found on hands

Answers

Everything that could have been on anything that you touched
since the last time you washed them are.
There are bacteria, viruses, fungi, and protozoa 

The amount of work done by two boys who apply 200 n of force in an unsuccessful attempt to move a stalled car is?

Answers

             Work = (force) x (distance)

It doesn't matter if the whole football team is pushing on it.
Until the car moves, no work has been done.

A car accelerates uniformly from rest to a speed of 58.3 mi/h in 9.47 s. Find the constant acceleration of the car.

Answers

58.3 mi/h = (58.3x1605)/3600= 24 m/s
Acceleration = 24/9.47= 2.5 m/s^2

after the box has left the rubber band but is still moving upward, what is the passenger's apparent weight?

Answers

If the upward acceleration is equal to the acceleration due to gravity (9.8 m/s^2), 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)

To know more about weight refer here

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What is the function of brushes ​

Answers

Answer:

A brush is a device which conducts current between stationary wires and moving parts, most commonly in a rotating shaft.

If you ride an elevator moving forward with a constant speed, is your apparent weight same,greater than or less than your weight?

Answers

If the elevator's speed is constant (in ANY direction) and you can't see out of it, then there's NO measurement you can make inside that will tell you that it's moving. Any weight you measure is normal.