Home
Class 11
PHYSICS
The average work done by a human heart w...

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

Text Solution

Verified by Experts

The work done per beat = 0.5 J
Total work done,
` W = 72xx0.5 J = 36 `(for 72 beats)
Power = `("Work done")/("Time") = 36/60 = 0.6 W `
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - D NCERT Exemplar Solutions (Short Answer Type Questions)|10 Videos
  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - D NCERT Exemplar Solutions (Long Answer Type Questions)|5 Videos
  • WORK, ENERGY AND POWER

    KUMAR PRAKASHAN|Exercise SECTION - D NCERT Exemplar Solutions (Multiple Choice Questions)|21 Videos
  • WAVES

    KUMAR PRAKASHAN|Exercise SECTION-F (Questions From Module) (Sample questions for preparation of competitive exams)|23 Videos

Similar Questions

Explore conceptually related problems

Work done by one heartbeat of human is 0.5 J , then express it in eV .

On an average a human heart is found to beat 81 times in a minute. Calculate its frequency and period.

On an average, a human heart is found to beat 75 times in a minute. Calculate its frequency and period.

On an average a human heart is found to beat 300 times in a minute. Calculate its frequency and period.

A person performs 420 J of work in 5 minutes. Calculate the power delivered by him.

Thirty women were examined in a hospital by a doctor and their heart beats per minute were recorded and summarised as shown . Find the mean heart beats per minute for these women, choosing a suitable method.

A monochromatic point source radiating wavelength 6000Å with power 2 watt, an aperture A of diameter 0.1 m and a large screen SC are placed as shown in fig, A photoemissive detector D of surface area 0.5 cm^(2) is placed at the centre of the screen . The efficiency of the detector for the photoelectron generation per incident photon is 0.9 (a) Calculate the photon flux at the centre of the screen and the photo current in the detector. (b) If the concave lens L of focal length 0.6 m is inserted in the aperture as shown . find the new values of photon flux and photocurrent Assume a uniform average transmission of 80% from the lens . (c ) If the work function of the photoemissive surface is 1eV . calculate the values of the stopping potential in the two cases (within and with the lens in the aperture).