A transformer has a turns ratio of 10. The primary voltage and current are 120. volts and 20. Amperes
(a) What is the primary impedance (ratio of primary voltage to current)?
(b) What is the secondary impedance?
(a) 6.0 ohms
(b) 0.60 K?
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Indicate whether the statement is true or false
A football kicker is attempting a field goal from 44m out. The ball is kicked and just clears the lower bar with a time of flight of 2.9s If the angle of the kick was 45°, what was the initial speed of the ball, assuming no air resistance?
A) 39 m/s B) 2.2 m/s C) 21.5 m/s D) 19.7 m/s
The average kinetic energy of the atoms in a spoon determines its __________
Fill in the blank(s) with correct word
An object moving at a relativistic speed past a stationary observer appears to
A. have length expanded and have a slower clock. B. have length contracted and have a slower clock. C. have length expanded and have a faster clock. D. have length contracted and have a faster clock. E. be completely normal.