Light must travel from an optically denser to a less dense or rarer medium. The incident ray is inside the optically denser of the two media.
johnmulu answered the question on February 14, 2017 at 05:52
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Date posted: February 14, 2017. Answers (1)
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Date posted: February 14, 2017. Answers (1)
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A stone thrown vertically upwards reaches a height of 100 m. Determine the:
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(Neglect air resistance and take g = 10ms-2)
ii) Total time the stone is in air.
Date posted: February 14, 2017. Answers (1)
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A ball of mass 200 g is thrown vertically upwards with velocity of 5 ms-1. The air resistance is 0.4 N. Determine:
i) The net force on the ball as it moves up;
ii) The acceleration of the ball;
iii) The maximum height reached by the ball,
(take acceleration due to gravity g = 10 ms-2)
Date posted: February 14, 2017. Answers (1)
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Date posted: February 14, 2017. Answers (1)
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ii) The speed at which the trolley struck the barrier.
Date posted: February 14, 2017. Answers (1)
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A matatu starts from rest and accelerates to cover a distance of 49 m in 7 seconds. Determine:
i) Its acceleration;
ii) Its velocity after 7 seconds
Date posted: February 14, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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Date posted: February 11, 2017. Answers (1)
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A boy standing in front of a cliff blows a whistle and hears the echo after 0.5 s. He then moves 17 metres further away from the cliff and blows the whistle again. He now hears the echo after 0.6 s. Determine the speed of the sound.
Date posted: February 11, 2017. Answers (1)
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A soldier standing some distance from a wall, blow a whistle and hears its echo 1.8 seconds later. How far is the wall from the soldier? (Speed of sound in air is 330ms-1)
Date posted: February 11, 2017. Answers (1)