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The area of a typical eardrum is about 5.0x10?5 m2.
What is the sound power (energy per second) incident on the eardrum at the threshold of hearing?
What is the sound power (energy per second) incident on the eardrum at the threshold for pain?
A beam of light traveling in water strikes a surface of a transparent material at an angle of incidence of 45°. what is the index of refraction of the material
A ball of mass 0.30 kg is fired with velocity 160 m/s into the barrel of a spring gun of mass 2.5 kg initially at rest on a frictionless surface. What fraction of the ball's initial kinetic energy is stored in the spring
q1. at one instant a bicyclist is 40.0 m due east of a parks flagpole going due south with a speed of 10.0 ms. then
A device used in radiation therapy for cancer contains 0.38 g of cobalt-60 (59.933 819 u). Determine the activity (in Bq) of the radioactive material
What is the magnitude of the acceleration of a modified Atwood machine if the mass of the cart is 3 kg and the hanging mass is 4 kg? (Use g = 9.8 m/s2. Express your answer to one decimal point.)
Two converging lenses with focal lengths of f1 = 2.00 cm and f2 = 5.00 cm are situated 14.0 cm apart on a long optics bench. determine Is the final image real or virtual
A force of 725 N accelerates a 325kg object, initially moving at 7.50 m/s, to a final velocity of 28.5 m/s in 16.5 seconds. What was the change in kinetic energy of the object
A single current carrying loop has a magnetic dipole moment of 10i - 20j + 15k Am2 and is in a region of space, Find the potential energy of the loop
The earth orbits the sun once per year at the distance of 1.50 x 1011 m. How long (in earth days) does it take for Venus to make one orbit
Assume that a 7.0-cm-diameter, 50 W light bulb radiates all its energy as a single wavelength of visible light. Estimate the magnetic field strength at the surface of the bulb
The current in a 100 watt lightbulb is 0.720A. The filament inside the bulb is 0.240mm in diameter. What is the electron current in the filament
In a very silly game at the coffee shop, you see who can slide the coffee cup closest to the edge of the table without sending it over the edge. How far from the edge of the table does the cup land
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