Advertisements
Advertisements
प्रश्न
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
Advertisements
उत्तर
Total work done by the heart in one minute (i.e. 60 s.) is 72 beats or 72 joules.
∴ Power of heart =`("W(in Joules)")/("Time(in s)")=72/60"watts"` = 1.2 watts.
संबंधित प्रश्न
Why is a jack screw provided with a long arm?
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
State two advantage of producing hydroelectricity.
State two disadvantages of producing hydroelectricity.
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Give an example
Electrical energy changes of sound energy.
A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
