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Category: Class 9

A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Class 9 Physics
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Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

Class 9 Physics
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What are the various energy transformations that occur when you are riding a bicycle?

Class 9 Physics
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Question4: Classroom activity (Constructing the ‘square root spiral’): Take a large sheet of paper and construct the ‘square root spiral’ in the following fashion. Start with a point O and draw a line segment OP1 of unit length. Draw a line segment P1P2 perpendicular to OP1 of unit length. Now draw a line segment P2P3 perpendicular to OP2. Then draw a line segment P3P4 perpendicular to OP3.

Class 9 Maths Maths Formulas
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Question3: Show how √𝟓 can be represented on the number line.

Class 9 Maths Maths Formulas
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Question2: Are the square roots of all positive integers irrational? If not, give an example of the square root of a number that is a rational number.

Class 9 Maths Maths Formulas
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Question1: State whether the following statements are true or false. Justify your answers.

Class 9 Maths
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The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?

Class 9 Physics
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A mass of 10 kg is at a point A on a table. It is moved to point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.

Class 9 Physics
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The certain force acting on a 20 kg mass changes its velocity from 5 m s–1 to 2 ms–1. Calculate the work done by the force.

Class 9 Physics
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A battery lights a bulb. Describe the energy changes involved in the process?

Class 9 Physics
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An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

Class 9 Physics
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