A 20.-N force stretches the spring by 1.00 m - 0.50 m = 0.50 m, so by Hooke's law the spring constant is k such that

20. N = k (0.50 m)

⇒ k = (20. N) / (0.50 m) = **40 N/m**

**Answer:**

**Explanation:**

As we know that at isochoric conditions if pressure of the gas is tripled then the temperature also becomes 3 times

So heat given in this process is given as

Now it is expanded to initial pressure again by adiabatic process

So in this part there is no heat exchange

Also we know that

Now in the last process we compressed the gas to original volume

Now total heat in the process is given as

**Answer: A mechanical wave is a wave that's an oscillation of matter and thus transfers energy through a medium. Therefore, the oscillating material doesn't move aloof from its initial equilibrium position. Mechanical waves transport energy, this energy propagates in the same direction because of the wave.**