Advertisements
Advertisements
प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
उत्तर
- An engine applies force to pull the train. This allows the train to move in the direction of force.
- Therefore, there is a displacement in the train in the same direction.
- Hence, work is done by the engine on the train.
APPEARS IN
संबंधित प्रश्न
How is work related to energy?
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
What do you mean by degradation of energy?
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Is work done a scalar or a vector physical quantity?
Can every force produce work?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Fill in the boxe to show the corresponding energy transformation.
Give an example
Light energy changes to electrical energy.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
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?
