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The sound intensity of 1.4x10-12 J/m2s is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules if the speed of sound in the air is 331 m/s and the density of air is 1.2 kg/m3? Take the frequency of the air molecules as 1000 Hz.
A girl with a mass of 40 kg is swinging from a rope with a length of 3.2 m. What is the frequency of her swinging
air enters a compressor operating at steady state with a pressure of 14.7 lbfin.2 and a temperature of 70 of. the
A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.10 s after liftoff, the rocket clears the top of its launch platform, Calculate the magnitude of the average velocity of the rocket
The emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.58 m, Calculate the power emitted by the human body
A typical adult ear has a surface area of 1.49 × 10-3 m2. The sound intensity during a normal conversation is about 2.11 × 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
A diffraction grating produces a first-order maximum at an angle of 25.0 degree. What is the angle of the second-order maximum
A puck slides across a smooth, level tabletop at height H at a constant speed vo. It slides off the edge of the table and hits the floor a distance x away as shown in the figure. What is the algebraic relationship between the distances x and H?
An accelerating voltage of 2.65 multiply.gif 103 V is applied to an electron gun, What is the magnitude of the deflection on the screen caused by the Earth's gravitational field
A 3.9×10-24-kg particle is vibrating with simple harmonic motion with a period of 1.8×10-5 s and a maximum speed of 1.70×103 m/s. Find the maximum displacement of the particle
One of the first signs of sunburn is the reddening of the skin (called erythema). How many photons are incident on the skin in this amount of exposure
You are working out on a rowing machine. Each time you pull the rowing bar (which simulates the oars) toward you, find the magnitude of the force that you exert on the handle
A proton and an electron are moving due east in a constant electricfield that also points due east. The electric field has amagnitude of 8.0x104 N/C. Determine the magnitude of the acceleration of the proton and the electron.
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