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Q1. An artificial satellite circling the Earth completes each orbit in 102 minutes. (The radius of the Earth is 6.38 106 m. The mass of Earth is 5.98 1024 kg.)

(a) Discover the altitude of the satellite in meters

(b) What is the value of g at the location of this satellite?

Q2. The nucleus of the copper atom contains 29 protons and has a radius of 4.8*10^-15m. How much work (in electron volts) is completed by the electric force as a proton is brought from infinity, where it is at rest, to the "surface" of a copper nucleus?

Q3. A uniform plank of length 5.7 m and weight 205 N rests parallel on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 444 N walk on the overhanging part of the plank before it just begins to tip?

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