The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heat if it beats 72 times in a minute.

1 Joule of energy is used for one heart beat. Calculate the power of the heart if it beats 72 times in one minute.

What will be the frequency of Mohan's heart when it beats 75 times in 1 minute ?

How many times the heart of a normal person beat per minute?

For the reaction R rarr P , the concentration of a reactant changes from 0.03M to 0.02M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.

A bar magnet of magnetic moment 6J/T is aligned at 60^@ with a uniform external magnetic field of 0.44 T. Calculate the work done in turning the magnet to align its magnet moment normal to the magnetic field.

Suppose the average mass of raindrops is 3.0 xx 10^-5 kg and their average terminal velocity 9 ms^-1 . Calculate hte energy transferred by rain to each square metre of the surface at a place which receives 100 cm of rain in a year.

The first law of thermodynamics for a closed system is dU = dq + dw, where dw = dw_(pv)+dw_("non-pv") . The most common type of w_("non-pv") is electrical work. As per IUPAC convention work done on the system is positive. A system generates 50 J electrical energy, has 150 J of pressure-volume work done on it by the surroundings while releasing 300 J of heat energy. What is the change in the internal energy of the sytem?