A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^-27 kg, qProton = +1.6 × 10^-19 C.]


7.8 × 10^-7 s

Physics & Space Science

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Consider a high-speed bus colliding head-on with an innocent bug. The force of impact splatters the unfortunate bug over the windshield. Which is greater, the force on the bug or the force on the bus?

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The reason the north pole of a bar magnet free to rotate points north is because

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Physics & Space Science