What force applied parallel to the plane is necessary
to move a 16 kg object up a frictionless plane with a
uniform acceleration of 20 m s-2, if the plane makes
an angle of 60° with the horizontal ? [Ans. 455.8 N]
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Explanation:
electron mass of 9.11 x 10-31 kg has an initial speed of 3 x 105 m/s. It travels in a straight line, and its speed increases to 7 x 105 m/s in a distance of 5 cm. Assuming the acceleration is constant,
(a) determine the force exerted on the electron
(b) compare this force with the weight of the electron, which was neglected
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