A converging lens with the same curvature on both sides and focal length 25. cm is to be made from crown glass (n = 1.52). What radius of curvature is required for each face?
What will be an ideal response?
26. cm
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Based on current evidence, a supercluster is most likely to have formed in regions of space where ________
A) the acceleration of the expansion was proceeding faster than elsewhere B) the density of dark matter was slightly higher than average when the universe was very young C) supermassive black holes were present in the very early universe D) there was an excess concentration of hydrogen gas when the universe was very young
Why is Mars so much colder than the Earth?
A) because the albedo of Mars is higher than the Earth B) because Mars has a much thinner, more diffuse atmosphere C) because Mars has a little less gravity than the Earth D) because Mars is farther from the Sun
A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A) 200 N B) 120 N C) 160 N D) 150 N E) 0 N
A series circuit consists of a 0.440-H inductor, a 380.0-? resistor, a 5.70-?F capacitor, and an ac voltage source of amplitude 250V. Find the rms voltage across the capacitor when the circuit operates at resonance
What will be an ideal response?