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A fight breaks out at club event in Hollywood. As a result, a chair hits a 4.0 meter long metal baron the stage. A microphone at the other end of the bar picks up two pulses of sound (over the roar of the crowd, of course). One of the pulses traveled through the metal bar, the other through the air. The pulses are separated by 9.00 m.
A. Find at what speed did the sound pulse travel through the metal bar?
B. If the microphone measured the intensity level of the impact at 115 dB, find what was the decibel level of the sound at the door of the club 15 meter away?
A car starts from rest and then accelerates uniformly to a linear speed of 14 m/s in 38 s. If the tires have a radius of 28 cm, calculate the average linear acceleration of a tire
a heat engine absorbs 120 j of heat from the hot reservoir and releases 60 j of heat to the cold reservoir during each
Charges of 4.0 mC and - 6.0mC are placed at two corners of an equilateral triangle with sides of 0.10 m. At the third corner, what is the electric field created by these two charges
Two cars traveling in opposite directions collide head on and are brought to rest. estimate the change in entropy of the universe
A factory worker pushes a 31.4kg crate a distance of 4.35m along a level floor at constant velocity by pushing downward at an angle of 30.3 degrees below the horizontal. What is the total work done on the crate
A playground carousel ("merry-go-round") is free to rotate frictionlessly in the horizontal plane (and air resistance is negligible). Find the person's mass
Ruby lases at a wavelength of 555 nm. Acertain ruby crystal has 4.00 multiplied by 1019 Cr ions (which are the atomsthat lase). What is the average power emitted during the pulse
In the Bohr model of hydrogen, the electron moves in a circular orbit around the nucleus. Determine the angular speed of the electron
A traffic controller at the airport watches a commercial plane circling above at a distance of 16.0 km as the pilot waits for clearance to land
Derive an expression for spring potential energy (Us), where the spring force is Fs = -kx and delta U = -Wc, where Wc is the work done by conservative forces
Two resistors of values 6 and 12 ohms are connected in parallel. This combination in turn is hooked in series with a 4 ohm resistor. Find the overall resistance of this combination
An ocean liner leaves New York City and travels 37.0° north of east for 171 km. How far east and how far north has it disappeared? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions.
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