Ridges in the middle of the ocean are places where
A) one plate slides under another, returning older crust to the mantle.
B) hot mantle material rises upward, creating volcanic islands.
C) hot mantle material rises upward and spreads sideways, pushing the plates apart.
D) plates push together, creating ocean mountain chains.
E) plates slip sideways relative to one another.
C
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A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
a. 15 mm b. 12 mm c. 18 mm d. 24 mm e. 8.5 mm
The radiation curve is a plot of light intensity versus frequency for an incandescent source such as a glowing lamp filament. If the source of light were excited atoms in the gaseous phase, the radiation curve would look like
1) I. 2) II. 3) III. 4) IV. The plot shown in IV is of 5) monochromatic light. 6) a very bright source. 7) light that has passed through a thin slit.
What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic. B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force. C) Opposite electric charges attract and like charges repel. D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge. E) Alternating current and direct current are both capable of doing work.
A projectile is shot horizontally at 23.4 m/s from the roof of a building 55 m tall and experiences negligible air resistance
(a) Determine the time necessary for the projectile to reach the ground below. (b) Determine the distance from the base of the building that the projectile lands. (c) Determine the horizontal and vertical components of the velocity just before the projectile reaches the ground.