The answer is either A or D
Answer:
The fireside poets also known as the schoolroom or household poets Explanation:
i helped my sis with it and got it correct
Answer:
D. 2 m/s²
Step-by-step explanation:
Initial speed of the runner (u) = 6 m/s
Final speed of the runner (v) = 14 m/s
Time taken (t) = 4 s
By using equation of motion, we get:

Acceleration of the runner (a) = 2 m/s²
Answer:
The efficiency of the engine is 75% under given conditions.
<u>Explanation:
</u>
<em>Efficiency is defined as the ratio of work done by the engine to the total heat supplied to a heat engine</em>. We know work done by the heat engine be difference between total heat supplied
by total heat utilized
. We can derive formula for efficiency by considering the above factors,
Now consider a heat engine is at a temperature of 500K and the heat produced by the engine released to the surroundings at a temperature of 125K. The efficiency is calculated by using the above formula,
∴ Efficiency of the engine is 75%