1999 - JAMB Physics Past Questions and Answers - page 4
A rectifier of an alternating current is a device which allows the flow of current only in one direction
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Acceleration = slope = AE/OE = 80/20 = 4m/s2
∴ acceleration and retardation = 4m/s2; 2m/s2
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Since P1 is frictionless and P2 as shown is simply used as a hook for the effort, the weight W = 40N
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The solid will fall over if when the vertical line through G lies outside the base, when slightly tilted
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Since the temperature of the air is to remain Constant => P1V1 = P2V2
∴ 75 x 30 = (75 + 15) x V2
75 x 30 = 90 x V2
=> V2 = | 75 x 30 |
_90 |
= | 2250 |
_90 |
= 25cm2
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The frequency f = V/λ,
Where λ = wavelength
From the above, the distance OA = one wavelength; AB = one wave length and BC = one wavelength.
=> OC = 3 wavelength = 3λ
∴3λ = 0.3M
λ = 0.3/3
= 0.1m
∴ f = V/λ = (3.0 x 108) / 0.1
= 3.0 x 109Hz
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