A system comprised blocks, a light frictionless pulley, and connecting ropes is shown in the figure. The 9.0-kg block is on a perfectly smooth horizontal table
The surfaces of the 12-kg block are rough, with between the block and the table. If the 5.0-kg block accelerates downward when it is released, find its acceleration.
A) 1.0 m/s2
B) 1.2 m/s2
C) 1.4 m/s2
D) 1.6 m/s2
E) 1.8 m/s2
Answer: A
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Equipotential surfaces around a point charge are
a. spherical. b. cylindrical. c. planar. d. none of these choices.
The crust of Mars is believed to _____________ than Earth's
a. be much thinner b. be younger c. contain more water d. be more geologically active e. be much stronger
A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with a frequency of 2.50 Hz in a city where g = 9.80 m/s2
What is the radius of the ornament? The moment of inertia of a hollow sphere of mass M and radius R about a point on its edge is 5MR2/3. A) 1.84 cm B) 3.68 cm C) 2.38 cm D) 3.98 cm E) 4.69 cm
A parallel plate capacitor is charged to voltage V and then disconnected from the battery. Leopold says that the voltage will decrease if the plates are pulled apart. Gerhardt says that the voltage will remain the same. Which one, if either, is correct, and why?
a. Gerhardt, because the maximum voltage is determined by the battery. b. Gerhardt, because the charge per unit area on the plates does not change. c. Leopold, because charge is transferred from one plate to the other when the plates are separated. d. Leopold, because the force each plate exerts on the other decreases when the plates are pulled apart. e. Neither, because the voltage increases when the plates are pulled apart.