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Two small metallic spheres, each of mass m = 0.45 g, are suspended as pendulums by light strings from a common point. The spheres are given the same electric charge, and it is found that they come to equilibrium when each string is at an angle of ? = 7.0° with the vertical. If each string has length L = 26.0 cm, what is the magnitude of the charge on each sphere?
What is the wavelength of the waves emitted by source? What is the difference in frequency between directly radiated waves and the waves reflected from a whale travelling straight toward the ship at 4.99? Suppose that the ship is at rest in the water..
A spring has a spring constant of k = 7.500N/m. If the spring is displaced 0.5500 from its equilibrium position, what is the force that the spring exerts
You stand on a frictional platform that is rotating at 1.3 rev/s. Your arms are outstretched, and you hold a heavy weight in each hand. What is the resulting angular speed of the platform
The molar mass oxygen gas is 32.0 x 10^-3 kg/mol. If the gas is at 21 degrees C, find the root-mean-square speed for an oxygen molecule
Two sinusoidal waves of the same period, with amplitudes of 5.0 and 6.5 mm, travel in the same direction along a stretched string; they produce a resultant wave with an amplitude of 10.036 mm. The phase constant of the 5.0 mm wave is 0. What is th..
The electron mass is 9×10?31 kg. What is the magnitude of the momentum of the electron
A neon sign in a shop operates at around 12 kV (rms). A transformer is to step-up the 120 V (rms) line voltage to that value. How many turns must be placed into the primary coil
A long solenoid has 1.56e+3 turns in length of 40.0 cm. What current has to flow through the solenoid in order to generate a magnetic field
0.110kg stone rests on a frictionless, horizontal surface. A bullet of mass 9.00g , traveling horizontally at 370m/s, Compute the magnitude of the velocity of the stone after it is struck
A motorcycle and a police car are moving in the same direction, with the motorcycle in the lead. What frequency does the motorcyclist hear
A Heliun-Neon laser illuminates a narrow, single slit that is 1850 nm wide. Determine the wavelength of the light from the laser
proton is confined to a nucleus that has a diameter of 5.6 10-15 m. what is the minimum uncertainty in its momentum
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