CBSE Class 9 Answered
1)state energy conversion takes place in hydroelectric power plants?
2)an object of mass 1kg is falling from a height of 10 m. Calculate
i) the total energy of object at h=10m
ii) Potential energy of an object when h=4m
3)Name energy transfers which occurs when
a)an electri bell rings
b)someone speake into a microphone
c)there is a picture on television screen
d)A torch is on
Asked by mailtoparvathyprajith | 08 Feb, 2024, 12:32: PM
Expert Answer
1) Potential energy of water stored at height -> Kinetic energy of flowing water -> mechanical energy of turbine -> electrical energy
2) (i) W = m x g x h
When h = 10 m
g = 9.8 m/s2
Potential energy will be = Work done = m x g x h = 1 x 9.8 x 10 = 98 J ...
(ii) When the object reaches height of 4 m,
The potential energy at 4 m = Work done = m x g x h = 1 x 9.8 x 4 = 39.2 J
3)
(a) electrical energy -> sound energy
(b) Sound energy -> electrical energy
(c) electrical energy -> light energy
(d) electrical energy -> light energy
Answered by Shiwani Sawant | 08 Feb, 2024, 03:12: PM
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