An engine does 15.0 kj of work while exhausting 37.0 kj to the cold reservoir. what is the efficiency of the engine?

28.8 %

Explanation:

The efficiency of an engine is given by:

where

W is the useful work done

is the heat in input

For this machine, we have

W = 15.0 kJ is the work done

is the heat exchausted to the cold reservoir, so the total amount of heat in input is

And so the efficiency is

which corresponds to 28.8 %.

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

a=d/t

a="triangle"v/t

explanation:

a = acceleration