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Q. The aurora is caused when electrons and protons, moving in the earth's magnetic field of , collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit for (a) an electron with speed 4.0×106 and (b) a proton with speed 6.0×104 .

what kind of equation or background information is useful for a problem like this?

Q. A 1 kg ball released from horizontal attatched to a 2.5m string collides ellastically with a 2 kg block at rest. what is the speed of the block after the collision?

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