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A solid ball has a weight of 3.0N. When it is submerged in water,it has an apparent weight of 2.7N. What is the density of the ball?
The fundamental frequency of a pipe that is open at both ends is 560 hz . a) How long is this pipe? Use v = 344m/s . b) If one end is now closed, find the wavelength of the new fundamental. c) If one end is now closed, find the frequency of the new f..
Energy stored in Electric and Magnetic Fields: A magnetic field has a magnitude of 10 T. What is the magnitude of an electric field that stores the same energy per unit volume as this magnetic field? What is the ratio of this computed electric field ..
The system is released from rest, and the string moves without slipping over pulley. If the larger mass is traveling at a velocity of 2.25 m/s when it has dropped 1m, how much mechanical energy was lost due to friction in the pulley's axle.
A car with a 1.49 m long radio antenna travels at 94.5 km/h in aplace where the Earth’s magnetic field is 6.93 ×10^−5 T. What is the maximum possible induced emf in the antenna as it moves through the Earth’s magnetic field?
The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density of course, become less with altitude. But suppose the density of air were a constant 1.2 kg/m^3. Calculate where the top of the atmosphere would be.
In a photoelectric-effect experiment, the maximum kinetic energy of electrons is 3.2eV . When the wavelength of the light is increased by 50% , What is the work function of the cathode
A ball is thrown upward at a speed v0 at anangle of 52.0° above the horizontal. It reaches a maximumheight of 8.8 m. How high would this ball go if it were thrownstraight upward at speed v0?
Antennas for radio transmission and reception are particularly effective if they're about a half-wavelength long. What's the appropriate length for an FM antenna
a 0.151 glider is moving to the right on a frictionless horizontal air track with a speed of 0.860 . it has a head-on
A sphere is charged with electrons to ?1 × 10^-5 C. How many electrons make up this charge
As you walk away from a vertical plane mirror, your image in the mirror
Two very thick equally-magnetized square plates of side 0.23m and of mass 20 g, are hung by threads 20.0 cm long from a common point. Calculate the magnetic field energy stored between the two plates
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