Rotational Dynamics: A 350-g air track cart on a horizontal air track is attached to a string that goes over a frictionless pulley with a moment of inertia of 6.00 × 10-6 kg ? m2 and a radius of 1.35 cm. If the string is pulled vertically downward by a force of 2.50 N, (a) what is the magnitude of the acceleration of the cart, and (b) what is the tension in the horizontal string between the pulley and the cart?
What will be an ideal response?
(a) 6.53 m/s2 (b) 2.29 N
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Vibration of an object about an equilibrium point is called simple harmonic motion when the restoring force is proportional to
A. time B. displacement C. A spring constant D. mass
A white dwarf that exceeds the Chandresekhar limit ____
a. will collapse to form a neutron star b. will explode as a nova, and may repeat the cycle over time c. is completely destroyed by carbon deflagration d. breaks apart and forms an excretion disk e. becomes a degenerate object
One ancient Greek scientist, Aristarchus, had a theory about the layout of the universe that was quite different from the other Greek theories. According to Aristarchus's theory,
A) Earth is at the center and other objects move around Earth in simple circles. B) the sun is at the center and other objects, including Earth, move around the sun in simple circles. C) Earth is at the center, and the planets move around Earth in orbits that could be described as "circles-within-circles" or "loop-the-loops." D) the Earth is held up by Hercules, who stands on a turtle, who stands on an elephant, who stands on Zeus, who is beginning to think that the whole thing isn't worth the effort. E) there is no fixed center anywhere in the universe.
A charged particle is placed at rest in the middle of a vacuum chamber, an enclosure that has been emptied of all matter. Consider some point X near a particular corner of the chamber
Neglecting all influences other than the charged particle, what can be said regarding electric fields and electric forces at point X? A) The is an electric field at X, but no electric force. B) There is both an electric field and an electric force at X. C) There is neither an electric field nor an electric force at X. D) There is no electric field at X but there is an electric force at X. E) It is impossible to answer this question without knowing what kind of charge the particle has.