Metal detectors that locate metal beneath sand on a beach are activated by
A) electric fields.
B) magnetic fields.
C) electromagnetic induction.
D) alternating current.
Answer: C
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Three +3.0-?C point charges are at the three corners of a square of side 0.50 m. The last corner is occupied by a -3.0-?C charge. Find the magnitude of the electric field at the center of the square. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
What will be an ideal response?
A 3.00-kg stone is dropped from a 39.2 m high building. When the stone has fallen 19.6 m, the magnitude of the impulse it has received from the gravitational force is
a. 9.80 N s. b. 19.6 N s. c. 29.4 N s. d. 58.8 N s. e. 118 N s.
If the change in wavelength is less than zero, then the radial velocity tells you that the star is moving _______________ you
a. parallel to b. away from c. towards d. in circles around
Each of the following is a prediction of the theory of relativity (special or general). Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) Gravity is curvature of spacetime. B) E = mc2 C) If you observe someone moving by you, you'll see his/her time running slow. D) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.