Consider a car that travels between points A and B. The car's average speed can be greater than the magnitude of its average velocity, but the magnitude of its average velocity can never be greater than its average speed
A) True
B) False
A
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A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m. What is the maximum magnetic field of this wave? (c = 3.0 × 108 m/s)
A) 8.7 × 10-6 T B) 3.4 × 10-4 T C) 2.2 × 10-5 T D) 4.0 × 10-6 T E) 9.6 × 10-6 T
Why is siltation such a pressing question for dam builders? Explain how you decided on your answer
What will be an ideal response?
Point P is outside a spherical charged balloon that someone is inflating. The balloon’s center remains fixed relative to P. The electric field’s magnitude E ? at P grows as the balloon’s charged surface approaches.
Indicate whether the statement is true or false.
Observations of radio waves from astronomical objects suffer from poorer resolution than visible observations with the same size dish (or mirror) because
a. the signals are so weak in the radio region. b. the wavelength of radio waves is much longer than the wavelengths of visible light. c. radio telescopes are generally much smaller in diameter than optical telescopes. d. it is very difficult to detect radio waves. e. radio telescopes don't use solid mirrors.