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प्रश्न
In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?
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उत्तर
Ideal machine has 100% efficiency i.e., work done on the machine = work done by the machine.
संबंधित प्रश्न
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Why is the work done on an object moving with uniform circular motion zero?
Distinguish between work and power.
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
What are the advantages and disadvantages of using solar cells for producing electricity?
