An electric field produces a magnetic field even when there is no wire to conduct a current provided:
a. the electric field is changing as time passes.
b. the electric field is different from place to place.
c. the electric field changes in time but at each instant is the same at every location.
d. the electric field is between a pair of parallel metal plates.
e. the electric field does not change as time passes.
a
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Consider a heavy object which is thrown straight up, reaches its highest point, and then falls back down to the ground. During what parts of the trajectory was it in "FREE FALL"? (assume here that air friction is negligible)
What will be an ideal response?
Parallel light rays from a distant object strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point. b. a point beyond the mirror's focal point. c. a point nearer than the mirror's focal point. d. none of the above.
Why do we think Mercury has so many tremendous cliffs?
A) They were probably carved in Mercury's early history by running water. B) They were probably formed by tectonic stresses when the entire planet shrank as its core cooled. C) They probably formed when a series of large impacts hit Mercury one after the other. D) They are almost certainly volcanic in origin, carved by flowing lava. E) They represent one of the greatest mysteries in the solar system, as no one has suggested a reasonable hypothesis for their formation.
A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the vertical component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s