Advertisements
Advertisements
प्रश्न
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Advertisements
उत्तर
The work done against gravity is zero when a body is moved horizontally along a frictionless surface because the force of gravity is perpendicular to the displacement in this case.
APPEARS IN
संबंधित प्रश्न
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:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Explain degradation of energy by taking two examples of your daily life.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
What is the difference between renewable and non-renewable resources?
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
