Dispersing light from a hot wire gives what type of spectrum?
a. Line absorption
b. Continuous
c. Line emission
d. Ultraviolet
b
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Intensity: The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)
A. 6.7 pT B. 6.7 mT C. 6.7 nT D. 6.7 ?T E. 6.7 T
A bucket of water with total mass 26 kg is attached to a rope, which in turn is wound around a 0.04-m radius cylinder at the top of a well. A crank with a turning radius of 0.20 m is attached to the end of the cylinder and the moment of inertia of cylinder and crank is 0.11 kg·m2 . If the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls
toward the bottom of the well? (Assume rope's mass is negligible, that cylinder turns on frictionless bearings and that g = 9.8 m/s2.) a. 1.9 m/s2 b. 2.7 m/s2 c. 9.8 m/s2 d. 7.9 m/s2 e. 7.1 m/s2
When a comet passes near the Sun, part of it takes on the appearance of a large, bright ball from which the tail extends. This part is called
A) the nucleus. B) the coma. C) the plasma tail. D) the Oort core.
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. When they collide and stick, the combined-glider speed is
A) 0 m/s. B) 1/2 m/s. C) 1/3 m/s. D) 1/6 m/s. E) 1.5 m/s.