An engine with an input temperature of 755k and an exhaust temperature of 453k has the same efficiency as an engine that is 40% efficient. is this true or false? i am having trouble

True

Explanation:

The efficiency of a heat engine is defined as the ratio of work done by the energy to the input energy.

It is given by

Where, W is the work done and Q1 is the input heat.

Where, T2 is the temperature of cold reservoir and T1 is the temperature of hot reservoir.

Here, T1 = 755 K and T2 = 453 K

So, efficiency =

efficiency = 40 %

So, it is true.

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.