Daniel steps on the gas pedal of his car, and the engine increases its performance from zero to 2700 rpms (rotations per minute). What are the frequency and period?
(Hint: frequency is cycles per second.]

Answer

The frequency and the period are 45 cycles/second and 0.023 seconds

Explanation:

The frequency of the engine is given by :

We have, the engine increases its performance from zero to 2700 rpms.

Frequency,

The time period of the engine is given by :

T = f/f

So,

Hence, the required frequency and the period are 45 cycles/second and 0.023 seconds respectively.

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

mistakes are ok