A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg ? m2 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 gently released so it can descend under the influence of gravity. As the mass descends, the string unwinds and causes the pulley to rotate, but does not slip on the pulley. 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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A.) 0%. B.) 25%. C.) 50%. D.) 75%. E.) 100%.
A rubbed balloon will stick to a wooden wall, which demonstrates charge
a. transfer. b. potential. c. conservation. d. polarization.
Which of the following is NOT one of Hubble's types of galaxies?
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A 910-kg object is released from rest at an altitude of 1200 km above the north pole of the earth. If we ignore atmospheric friction, with what speed does the object strike the surface of the earth?
(G = 6.67 × 10-11 N • m2/kg2, Mearth = 5.97 × 1024 kg, the polar radius of the earth is 6357 km) A) 4.5 km/s B) 2.2 km/s C) 2.7 km/s D) 3.2 km/s E) 4.8 km/s