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Two speakers are driven by the same oscillator with frequency of 165 Hz. They are located 3.86 m apart on a vertical pole. A man really far away walks straight toward the lower speaker in a direction perpendicular to the pole, as shown in the figure....
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Iodine-131 has a half-life of 8 days. A 2-gram sample of initially pure iodine-131 is stored for 32 days. How many grams of iodine-131 remain in the sample afterwards?
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An experiment is done to compare the initial speed of bullets fired from different handguns: a 9 {\rm mm} and a .44 caliber. The guns are fired into a 10-{\rm kg} pendulum bob of length L. Assume that the 9-{\rm mm} bullet has a mass of 6 {\rm g} and the .44-caliber bullet has a mass of 12 {\rm...
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Decompose the force vector F into radial (i.e., parallel to r) and tangential (perpendicular to r) components as shown. Find the magnitude of the radial and tangential components, Fr and Ft. You may assume that theta is between zero and 90 degrees.
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When the play button is pressed, a CD accelerates uniformly from rest to 475 rev/min in 3.5 revolutions. If the CD has a radius of 6 cm, and a mass of 17 g, what is the torque exerted on it?
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A 0.200-kg block is placed on a vertical spring (k = 5.00x10^3) and pushed downward, compressing the spring 0.100 m. As the block is released, it leaves the spring and continues to travel upward. What height above the point of release will the block reach if air resistance is negligible?
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An ideal gas is in contact with a heat reservoir so that it remains at a constant temperature of 100 K. The gas is compressed from a volume of 28 L to a volume of 14 L. During the process the mechanical device pushing the piston to compress the gas is found to expend 4 kJ of energy. What is the...
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A copper rod (length=2.0 m, radius=3.0 10 3 m) hangs down from the ceiling. A 9.0-kg object is attached to the lower end of the rod. The rod acts as a spring, and the object oscillates vertically with a small amplitude. Ignoring the rod s mass, find the frequency f of the simple...
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In the polarizer/analyzer combination in the figure below, of the light intensity falling on the analyzer is absorbed. Determine the angle between the transmission axes of the polarizer and the analyzer.
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how ice skaters can quickly go from a slow to a fast spin
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- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
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- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas
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