An elevator releases 11200j of gravitational potential, Ask an Expert

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Q1. A 20X telescope has a 12 cm diameter objective lens.

What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?

Q2. An elevator releases 11200J of gravitational potential energy as descending 4m between floors. How much does elevator weigh?

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Category:- Physics
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