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Starting from rest, your friend dives from a high cliff into a deep lake below, yelling in excitement at the thrill of free-fall on her way down. You watch her, as you stand on the lake shore, and at a certain instant your keen hearing recognizes that the usual frequency of her yell, which is 917 Hz, is shifted by 54.5 Hz. Is this shift an increase or a decrease in the frequency?
How long has your friend been in the air when she emits the yell whose frequency shift you hear? Take 344 m/s for the speed of sound in air and 9.80 m/s2 for the acceleration due to gravity.
Laura buys a standard Lapple reverse-flow cyclone that has an outer diameter (D2) of 1.0 ft (0.3048 m). The volume flow rate of dusty air entering the cyclone is 0.260 m3 /s.
In a certain RLC circuit, the RMS current is 6.42 A, the RMS voltage is 235 V, and the current leads the voltage by 55.6°. Calculate the average power dissipated in the circuit
A stone is thrown directly upward from a height of 30 ft with an initial velocity of 60 ft/sec. Determine the time at which the stone reaches its maximum height
A galaxy located at a distance D of 1 million light years away has an angular size A= 5 degree. What is the approximate diameter of this galaxy
A car has its 0.45m long radio antenna oriented vertically upward and is traveling at highway speeds of 70 mph. Calculate the range of induced emf on the antenna
An atom (not a hydrogen atom) absorbs a photon whose associated wavelength is 281 nm, How much net energy (in terms of eV) is absorbed by the atom
A platform is rotating at an angular speed of 2.1 rad/s. A block is resting on this platform at a distance of 0.33 m from the axis. determine the smallest distance from the axis
define the rock's tangential deceleration. You want to visit your friend in Seattle during spring break. To save money, you decide to travel there by train. Unfortunately, your physics final exam took the full 3 hours.
You need to design a photodetector that can respond to the entire range of visible light. What is the maximum possible work function of the cathode
a child swings a mass on a string in a horizontal circle 1.2 meter off the ground. The string has a length of 0.6 meters, how far will the mass travel before it lands
A 0.80 kg framed picture hangs by a light wire on a nail. The 50 cm long wire is attached to both ends of the 40 cm wide picture frame, What is the tension in the wire
The radius of the hydrogen atom is 0.053 nm. find the Coulomb force between the electron and the proton in the atom
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