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Your bedroom is 8.0 m away from the living room. When requested by your parents to turn down your stereo, you do, and the intensity level where they are sitting in the living room drops from 50 dB to 45 dB.
Part A: What is the change in the power of the sound emitted by your stereo?
The mass of an object is 334 g, and its volume is determined to be 90 cc. What is the mass density of the object?
A glass optical fiber (n= 1.50) is submerged inwater(n=1.33). What is the critical angle for light to stay inside the fiber
Three point positive charges (q = 10-6 C) are on the corners of a square that has sides of length L = 1 m (see figure). Find the electric field on the fourth corner.
your physics teacher is holding a spinning wheel with angular momentum of 8 units upward while standing on a stationary
A blackened roof measures 20 m by 50 m. If the temperature of the sun's surface is 6000K, Stefan's constant (σ) is 5.7 x 10-8 Wm-2K-4, Determine how much solar energy is incident on the roof per minute
An astronaut on a strange planet discovers that she can jump a maximum horizontal distance of 17.0 m if her initial speed is 2.80 m/s. What is the free-fall acceleration on the planet? (Ignore air resistance.)
The equilateral glass prism shown has an index of refraction of 1.55. What is the smallest angle of incidence for which the ray of light will emerge from the right face of the prism
A cylinder of cross-sectional area 11 cm2 is fitted with a piston, which is connected to a spring with a spring constant of 1250 N/m, as shown in the figure. The cylinder is filled with 0.0050 mole of a gas.
5 kg of water at 60 degrees are put in contact with 1 kg of ice at 0 degrees and are thermally isolated from everything else. What is the change in entropy of the universe while the ice melts
Suppose 1.86 kg of water at 14.4C is mixed with 2.28 kg of water at 79C. After equilibrium is reached, the mixture has an uniform temperature of 49.9768C. What is the change in entropy of the system? The speci?c heat of water is 4186 J/kg · K.
A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the accelera..
Air streams horizontally past a small airplane's wings such that the speed is 63.0m/s over the top surface and 53.0m/s past the bottom surface. What is the direction of the net vertical force (including the effects of gravity) on the airplane
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