Question
A mass m moves in a vertical circle of radius R under
gravity. What is the minimum mechanical energy required to complete the circle?Solution
To complete a vertical circular motion , the mass must reach the top of the circle with non-zero speed , so that the tension at the top is ≥ 0 . The minimum speed at the top is found by setting tension = 0 and using: 
The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical ...
Which of the following statements is the final statement of the paragraph?
1. He equipped himself with a long, sturdy stick, and then started on his eighteen-kilometer expedition back to his village through the swollen flood w...
In each of the questions given below a sentence is given with three words in bold. Choose the option which gives the correct sequence of these words to ...
Which of the following will be the FOURTH sentence after the rearrangement?
Which of the following is the third sentence of the paragraph after rearrangement?
In the given question, a sentence has been broken into four parts and the parts are jumbled. Choose the option that provides the correct way to re-arran...
Which of the following is the fourth sentence in the paragraph?
Which should be the second sentence after rearrangement?
A) When someone burns out, the brain’s emotional responses become suppressed.
B) The brain can't cope any longer, and the person may well g...
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