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Q1. A krypton laser produces the cylindrical red laser beam 2.0mm in diameter with 5.0 W of power. What is the light intensity on the wall 2.50 m away from the laser?

Q2. A space vehicle is orbiting Earth in the circular orbit with a radius of 10,300,000 m. What is the minimum increase in speed that is essential for the vehicle to escape Earth's gravitational field? The mass of Earth is 5.97 x 10^24 kg and G = 6.67 X 10-11 Nm2/kg2.

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Category:- Physics
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