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Give one example each of a body possessing : (i) kinetic energy, and (ii) potential energy.
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A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? (Assume g = 10 m/s2).
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Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.
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What is the difference between gravitational potential energy and elastic potential energy? Give one example of a body having gravitational potential energy and another having elastic potential energy.
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If 784 J of work was done in lifting a 20 kg mass, calculate the height through which it was lifted. (g = 9.8 m/s2)
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When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
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A man is instructed to carry a package from the base camp at B to summit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If g = 10 m/s2,
- how much work does man do against gravity?
- what is the potential energy of the package at A if its is assumed to be zero at B?
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A car is accelerated on a levelled road and acquires a velocity 4 times of its initial velocity. During this process, the potential energy of the car :
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Write the full form of IUPAC.
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Name the three subatomic particles present in an atom.
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What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
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What are the building blocks of matter ?
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How is the size of an atom indicated ?
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Name the unit in which the radius of an atom is usually expressed.
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Write the relation between nanometre and metre.
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Why is it not possible to see an atom even with the most powerful microscope ?
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State whether the following statement is true or false :
The cathode rays obtained from all the gases consist of negatively charged particles called electrons.
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Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
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How many times is a proton heavier than an electron?
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What value has been given to the mass of this reference atom ?
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