On an average the human heart is found to beat 75 times per minute. Calculate its frequency.

At constant pressure certain quantity of water at 24^(@)C is heated. It was observed that the rise of temperature was found to be 4^(@)C per minute. Calculate the time required to rise the temperature of water to 100^(@)C at sea level by using formula.

The power used by the human heart while beating 72 times per minute is given by one of the following if the average work done during one singal beat is 0.5 J.

The decay contsnt of a radioactive substance is at the rate of 0.05 per hour. Calculate its half life and mean life .

For the reaction R to P , the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate average rate of reaction.

A tuning fork A produces 4 beats per second with another tuning fork B of frequency 320 Hz. On filing one of the prongs of A, 4 beats per second are again heard when sounded with the same fork B. Then the frequency of the fork A before filing is

The driving wheel of a locomative engine is 2.1 m in radius and it makes 75 revolutions per minute. Find the speed of the train in kmph.

Rate constant k for a first order reactions has been found to be 2.54 xx 10^(-3) sec^(-1) . Calculate its 3//4^(th) life. (log 4 = 0.6020)

Two sitar stings A and B playing the note 'ga' are slightly out of tune and produce beats of frequency 6Hz. The tension in the string A is slightly reduced and the beat frequency is found to reduce to by 3Hz. If the original frequency of a is 324 Hz, then what is the frequency of B ?