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When a body falls freely towards the earth, then its total energy
(c) remains constant. It is accordance with the law of conservation of energy. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-10/
(c) remains constant. It is accordance with the law of conservation of energy.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-10/
See lessYou lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase depends on
(d) When we lift a suitcase from the floor and keep it on a table, we do work against the weight of suitcase. The work done, being product of force and displacement, depends on the weight of the suitcase as well as on the height of the table from the floor. https://www.tiwariacademy.com/ncert-solutiRead more
(d) When we lift a suitcase from the floor and keep it on a table, we do work against the weight of suitcase. The work done, being product of force and displacement, depends on the weight of the suitcase as well as on the height of the table from the floor.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-10/
See lessThe speed of sound is largest in
(c) The speed of sound is more in solids, less in liquids and least in gases. Therefore, sound travel fastest in steel medium. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(c) The speed of sound is more in solids, less in liquids and least in gases. Therefore, sound travel fastest in steel medium.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessSpeed of sound (v) in a medium is related to its frequency (v) and wavelength (λ) as :
(a) Correct relation is v = v × λ https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) Correct relation is v = v × λ
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessA car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process, the potential energy of the car
(a) does not change. On a levelled road h and hence potential energy Ep = mgh remains unchanged. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) does not change. On a levelled road h and hence potential energy Ep = mgh remains unchanged.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
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