The ozone layer protects us from
A. gamma rays.
B. cosmic rays.
C. infrared radiation.
D. ultraviolet radiation.
Answer: D
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Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?
A) 15. V B) 30. V C) 0.15 kV D) 30. kV E) impossible to calculate from the information given
What is one "kilowatt-hour" [kW ? h]?
A) It is the energy output of one kilowatt operating for one hour. B) It is work done continuously for one hour. C) It is the force output of one kilowatt operating for one hour. D) It is the power output of a one kilowatt device. E) Actually, nobody knows what this term means.
The inductor in a radio receiver carries a current of amplitude 0.200 A when an ac voltage of amplitude 2.40 V is across it at a frequency of 1400 Hz. What is the value of the inductance?
A) 1.43 mH B) 1.36 mH C) 9.20 mH D) 4.42 mH E) 1.97 mH
Why are there so few tidal energy installations in existence? Explain
What will be an ideal response?