What is the average power dissipated by a 25-? resistor in an LRC series ac circuit for which the power factor is equal to 0.25 and the maximum voltage of the ac source is 8.0 V?
A) 0.16 W B) 0.040 W C) 0.62 W D) 0.080 W E) 0.32 W
D
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Banked Curves: A curved portion of highway has a radius of curvature of 65 m. As a highway engineer, you want to bank this curve at the proper angle for a steady speed of 22 m/s.(a) What banking angle should you specify for this curve?(b) At the proper banking angle, what normal force and what friction force does the highway exert on a 750-kg car going around the curve at the proper speed?
What will be an ideal response?
The order in which solar energy is converted to the kinetic energy of an automobile is
A) photocells, electrolysis, motor, fuel cells, kinetic energy. B) photocells, electrolysis, fuels cells, motor, kinetic energy. C) electrolysis, fuel cells, photocells, motor, kinetic energy.
Electric field lines symbolize
A. The force a positive charge would experience at the location of the line B. The path a positive charge would take if released at rest on one of the lines C. The distribution of electric charges in space D. Boundaries between regions of positive and negative charge
Which of the following provides evidence to support models of how fusion occurs in the Sun's core?
A) solar neutrinos B) solar flares C) Sun spots D) x-ray observations E) careful study of the Sun's atmospheric structure