A turntable has a moment of inertia of 3.0 × 10^-2 kg•m2 and spins freely on a frictionless bearing at 25 rev/min. A 0.60-kg ball of putty is dropped vertically on the turntable and sticks at a point 0.10 m from the center. By what factor does the kinetic energy of the system change after the putty is dropped onto the turntable?
a. 0.91
c. 0.83
b. 1.0
d. 1.5
C
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There are no stars anywhere within about 10,000 light-years of you, but at slightly greater distances, your sky is brightened by hundreds (perhaps thousands) of beautiful, star-filled structures, some with majestic spiral shapes. Where are you? A) You are in the universe about 380,000 years after the Big Bang when the cosmic microwave background radiation was formed. B) You are in intergalactic space within a rich cluster of thousands of galaxies. C) You are in the center of the Milky Way Galaxy, looking outward into the Local Group. D) You are in the universe when it was about 500 million years old, just before galaxies began to form. E) You are in the outskirts of a galaxy whose nucleus is a powerful quasar.
The direction of the acceleration of an object moving in a circle at constant speed is
a. changing, but pointing in a predictable direction. b. constant and pointing in only one direction. c. constant and pointing in two directions. d. none of these
What evidence supports or undercuts stiffer actions to protect the air? Explain
What will be an ideal response?
Equilibrium: A 120-kg refrigerator that is 2.0 m tall and 85 cm wide has its center of mass at its geometrical center. You are attempting to slide it along the floor by pushing horizontally on the side of the refrigerator. The coefficient of static friction between the floor and the refrigerator is 0.30. Depending on where you push, the refrigerator may start to tip over before it starts to slide along the floor. What is the highest distance above the floor that you can push the refrigerator so that it will not tip before it begins to slide?
A. 0.71 m B. 1.0 m C. 1.2 m D. 1.4 m E. 1.6 m