During winter, the northern polar cap of Mars is made of
A) a layer of carbon dioxide ice
B) a layer of water ice
C) carbon dioxide ice overlaying water ice
D) water ice overlaying carbon dioxide ice
C
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A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
a.
0.
b.
A roller coaster starting from rest descends 35 meters in its initial drop and then rises 23 meters when it goes over the first hill, which has a circular shape over the top
If a passenger at the top of the hill feels an apparent weight equal to one-half of her normal weight, what is the radius of curvature of the first hill? Neglect any frictional losses.
If each copper atom in a wire were to contribute two conduction electrons instead of just one, its conductivity would
A. increase by a factor of 4. B. increase by a factor of 2. C. remain the same. D. decrease by a factor of 2. E. decrease by a factor of 4.
All modern large optical telescopes are refractors
Indicate whether the statement is true or false