After 1 second, a ball dropped from rest will have fallen
A. 19.6 m.
B. 9.8 m.
C. 4.9 m.
D. 1.0 m.
E. 2.45 m.
Answer: C
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What observational evidence do we have that eruptions in the centers of galaxies involve magnetic fields?
What will be an ideal response?
Ions trapped in Earth's magnetic field give rise to
a. photosynthesis. b. auroras. c. ultraviolet radiation. d. ozone.
While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 3.0 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, down. e. 12.8 m/s, down.
Two point charges of + 20.0 ?C and - 8.00 ?C are separated by a distance of 20.0 cm. What is the intensity of electric field E midway between these two charges?
A) 25.2 × 106 N/C directed towards the negative charge B) 25.2 × 106 N/C directed towards the positive charge C) 25.2 × 105 N/C directed towards the negative charge D) 25.2 × 105 N/C directed towards the positive charge E) 25.2 × 104 N/C directed towards the negative charge