Advertisements
Advertisements
Questions
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
The heart does a work of 1 J per beat. If the heart beats 72 times in a minute, what will be its power?
The heart of a normal person beats 72 times in a minute and does a work of 1 joule per beat. What is power of the heart?
Advertisements
Solution
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
APPEARS IN
RELATED QUESTIONS
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
What is the condition for a force to do work on a body?
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Can work done be zero even if force acts on the body?
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.
