A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg and a radius of 12.5 cm. A mass of 423 g is attached to the free end of the string
With the string vertical and taut, the mass is released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate. What is the speed of the mass after it has fallen through 1.25 m? A) 2.00 m/s
B) 2.28 m/s
C) 1.97 m/s
D) 3.94 m/s
E) 4.95 m/s
C
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Which of the following waves exhibit interference?
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An object is dropped from a tall building. The net force acting on the object is the difference between the object's _________ and the force of air resistance
Fill in the blank(s) with correct word
A +3.0-µC point charge is initially extremely far from a positive point charge Q
You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm, y = 0.0 mm and the point charge Q to the point x = -3.0 mm, y = 0.00 mm. What is Q? (k = …) A) 27 pC B) 9.1 µC C) 4.6 µC D) 55 nC
Which of the following information is required to compute the mass of a galaxy using the rotation curve method?
A) The age of the galaxy B) The distance of the galaxy from the nearest rich galaxy cluster C) The total number of stars in the galaxy D) The true sizes of the orbits of stars or gas clouds within the galaxy