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Give the magnitude and direction of the ...

Give the magnitude and direction of the net force acting on (a) a drop of rain falling down with a constant speed, (b) a cork of mass 10 g floating on water, (c) a kite skillfully held stationary in the sky, (d) a car moving with a constant velocity of 30 km/h on a rough road, (e) a high-speed electron in space far from all material objects, and free of electric and magnetic fields.

Text Solution

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(a) to (d) No net force according to the First Law (e) No force, since it is far away from all material agencies producing electromagnetic and gravitational forces.
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Knowledge Check

  • A proton is observed to be moving with a constant velocity through a region of space. If E and B represent the electric and magnetic field respectively. This region of space may have

    A
    E=0 ,B=0
    B
    E=0 , B`ne0`
    C
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    D
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