Potassium goes to argon so that a proton in the K nucleus "vanishes" into a positron (positive electron ?) but keeps the same atomic mass at 38. ? I'd say that the number of the positron was 0, and the charge was +1 electronic charge.
Answer:
Explanation:
In the first case, the mass is at equilibrium. Therefore, the net force on the mass is equal to zero.
In the second case, the spring is compressed by an amount of D, which is equal to an elastic potential energy of
At this height, the gravitational potential energy of the mass is equal to
Then, the total potential energy at height D is
That ratio is called"efficiency". It doesn't need to be a percent.
It can just as well be a fraction or a decimal number.