What collects the light in a reflecting telescope?
a. a mirror
b. a lens
c. your eye.
d. a light bucket
Ans: a. a mirror
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A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm
Strictly speaking, if a beam of white light is shone through a piece of very thick glass, the first color to emerge from the other side is
1) white. 2) violet. 3) red. 4) green. This is because 5) all frequencies travel at c. 6) lower frequencies undergo more refraction in a medium. 7) higher frequencies of light travel at a faster average speed through a medium. 8) higher frequencies of light interact with more molecules in a medium.
A mass of 375 g hangs from a string that is wrapped around the circumference of a pulley with a moment of inertia of 0.0125 kg?m2 and a radius of 26.0 cm
When the mass is released, the mass accelerates downward and the pulley rotates about its axis as the string unwinds. What is the tension in the string? A) 1.21 N B) 2.45 N C) 3.68 N D) 1.84 N E) 0.605 N
A clarinet behaves like a tube closed at one end. If its length is 1.0 m, and the velocity of sound is 344 m/s, what is its fundamental frequency (in Hz)?
a. 264 b. 140 c. 86 d. 440 e. 172