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A driver travels northbound on a highway at a speed of 25.0m/s. A police car, travelling southbound at a speed of 40.0 m/s,approaches withits siren sounding at a frequency of 2,500 Hz. What frequency does the driver observe as the police car approaches?
A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. What is the altitude of the projectile at this instant
If a container has a water level 20 cm above the base and you punch a hole in the side 12 cm high
The intensity of the sound wave from a jet airplane is 9.1 W/m2 at a distance of 130 m. At what rate does the jet airplane radiate energy in the form of sound waves
A diver beneath the surface of water in a lake looks up at 27 degrees from the vertical to see a life ring floating on the surface. How far is the base of the smokestack from the life ring
A nearsighted person wears contacts with a focal length of ? 6.5cm, what is her uncorrected far-point distance
An electron moving in one dimension is confined between two walls seperated by a distance L = 10^-10 m. What is the average force that the electron exerts on the walls
The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 22.0 °C the air gap between the rods is 1.99 x 10-3 m
A car of mass 930 kg is traveling over the top of a hill, If the hill has a radius of curvature of 38 m and the car is traveling at 13 m/s, what is the normal force between the hill and the car at the top of the hill
The polarizability of large atoms can be estimated by using the formula for the polarizability of a metal sphere, \(\alpha = 4\pi\epsilon a^{3}\), Estimate the induced dipole moment of an oxygen atom
The nucleus of a ^125Xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in diameter. It has 54 protons and charge q = + 54e.
What mass (in grams) of steam at 100°C must be mixed with 124 g of ice at its melting point, in a thermally insulated container, to generate liquid water at 37.0°C.
Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +2.30 pC. By what percentage has the mass of the cube decreased
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