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146

In the series a.c circuit shown above, the p.d across the inductor is 8V_r.m.s and that across the resistor is 6V_r.m.s. The effective voltage is

A. 2V
B. 10V
C. 14V
D. 48V

View Answer & Discuss (1) JAMB 1999

147

The velocity y of a particle in a time t is given by the equation
y = 10 + 2t\(^2\)
Find the instantaneous acceleration after 5 seconds

A. 60 ms^-2
B. 20 ms^-2
C. 15 ms^-2
D. 10 ms^-2

View Answer & Discuss (14) JAMB 2000

148

A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum

A. 4.0 m
B. 3.0 m
C. 2.0 m
D. 1.5 m

View Answer & Discuss (14) JAMB 2000

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149

A sonometer wire is vibrating at frequency fo. If the tension in the wire is doubled while the length and the mass per unit length are kept constant, the new frequency of vibration is

A. ^f_o/₂
B. 2f_o
C. ^f_o/_√2
D. f_o√2

View Answer & Discuss (15) JAMB 2000

150

A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is

A. y = 0.15 sin 200π(x - 5.5t)
B. y = 0.15 sin π(0.01x - 5.5t)
C. y = 0.15 sin 5.5π(x - 200t)
D. y = 0.15 sin π(550x - 0.01t)

View Answer & Discuss (6) JAMB 2000

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