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Unformatted text preview: skater. Therefore the magnitude of
the force exerted by friction is
EX 4.16 An electron (mass =
kg)leaves one end of a TV picture tube with zero initial speed and travels in a straight
line to the accelerating grid, which is 1.80cm away. It reaches the grid with a speed of
m/s. If the accelerating force
is constant, compute (a) the acceleration; (b) the time to reach the grid; (c) the net force, in newtons. (ignore gravitational force)
(a) We know from kinematics third equation of motion we have
Given mass of the electron is
Initial speed of electrons is
Final speed of electrons is
The distance the electrons travel is
Acceleration of the electrons is
(b) From Newton’s first law of motion we have Time taken by electrons to reach the grid is (c) The net force in newtons is...
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