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A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1380 Hz. The bird-watcher, but, hears a frequency of 1450 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
a weight of 30.0 n is suspended from a spring that has a force constant of 190 nm. the system is undamped and is
A pendulum bob oscillates in simple harmonic motion between points A and -A. Which property of the bob goes to zero and changes direction at each extreme position a and -A.
A ping-pong ball has been electrostatically charged such that it has 2.5 x 1015 excess electrons. The ball has a massof 1.0 g. It is observed to float motionless in the presence of auniform electric field. What is the magnitude and direction of th..
What is the result of mixing 80g of ice at -20 degrees Celsius, into a 200g of water at 20 degrees Celsius? What fraction of the ice cube melts
An 85 kg jogger is heading due east at a speed of 2.3 m/s. Find the magnitude and direction of the sum of momenta of the two joggers
The magnetic field in a radio wave traveling through air has amplitude 2.5 10-11 T and frequency 2.9 MHz. Find the amplitude and frequency of the electric field
A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. The small wheel has a radius of 2.0cm and accelerates at a rate of 7.2rad/s^2 and it remains in contact with the pottery wheel (radi..
An object is located 5 cm to the left of a concave mirror that has a radius of curvature if 20 cm. Calculate the image distance from the mirror
A space traveller weighs herself on Earth, at a location where the acceleration due to gravity is 9.82 m/s2, and finds a value of 599 N. What is the traveller\'s mass on the planet
Miranda, a satellite of Uranus, is shown in part a of the figure below. It can be modeled as a sphere of radius 242 km and mass 6.68 1019 kg. What is his vector impact velocity
The loaded cab of an elevator has a mass of 3.0 x10^3 kg and moves 171 m up the shaft in 23s at constant speed. At what average rate does the force from the cable do work on the cab.
To investigate the structure of extremely small objects, such as viruses, the wavelength of the probing wave should be about one-tenth the size of the object for sharp images. If you use light of this wavelength, what would be the energy (in eV) of..
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