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A mass is suspended from the ceiling of a train car by a 45.4cm long piece of string. A passenger notices that the mass is deflected 14.7cm backward as the train accelerates forward. What is the train's acceleration?
An 0.82 kg bucket full of water is being swung by a rope in a vertical circle of diameter 2.31 m. Compute the least speed a bucket must be moving so that the water doesn't fall out.
In the circuit shown, the AC voltage source supplies an rms voltage of 157 V at frequency f. The circuit has R = 96 %u03A9, XL = 215 %u03A9, and XC =99 %u03A9. Find the rms current flowing in the circuit
A 110 volt hair dryer has 2 settings: 850 watts and 1250 watts. Determine the resistance of the dryer for both settings
The electric field at 0.50 m away from the center of a thin metallic spherical shell of radius 0.30 m is - 400×10^3 V/m. the charge density at the outer surface of the sphere is:
A 2.0 cm x 2.0cm x 9.0 cm block floats in water with its long axis vertical. The length of the block above water is 1.0cm What is the block's mass density
An electron and a proton each have a thermal kinetic energy of 3×kBT/2. Compute the de Broglie wavelength of each particle at the temperature of 2050 K. (kb is Boltzmann's constant, 1.38×10-23 J/K).
find the wavelength of a particle of mass m and charge q accelerated through a potential difference v for the
Two infinite lines ofcharge with equal linear charge densities l(C/m) are placed alongthe x and y axis. Derive an expression for the magnitude ofthe electric field at an arbitrary point (x, y).
A car is traveling with a speed of 17.0 m/s along a straight horizontal road. The wheels have a radius of 0.290 m. find the angular displacement of each wheel during this period
a 0.060 kg tennis ball, initially moving at a speed of 10 m/s, What is the change in momentum of the ball in kg m/s
Two speakers, one directly behind the other, are each generating a 295-Hz sound wave. What is the smallest separation distance between the speakers that would produce destructive interference at a listener standing in front of them? Take the speed..
an aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of 15degc. both
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