Which one of the following requires wind energy?

MCQ

Parachute

shaalaa.com

क्या इस प्रश्न या उत्तर में कोई त्रुटि है?

अध्याय 3: Energy - Evaluation [पृष्ठ १२८]

अध्याय 3 Energy
Evaluation | Q I 4. | पृष्ठ १२८

Write true or false of the following statement.

Potential energy changes into kinetic energy when it is put to use

Select the correct alternatives

The correct statement is

State the unit of energy and define it.

Answer the following in a word or two or in a sentence.

Write the formula for calculating the efficiency of a machine.

Define the term 'watt'.

Take two aluminium channels of different lengths.
Place the lower ends of the channels on the floor and hold their upper ends at the same height.
Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.

At the moment of releasing the balls, which energy do the balls have?
As the balls roll down which energy is converted into which other form of energy?
Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"?
What is the form of the eventual total energy of the balls?
Which law related to energy does the above activity demonstrate? Explain.

The capacity that an object has for doing work is called ______.

Can you tell?

When can we say that displacement has taken place?

Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.