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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.
What quantum number of the hydrogen atom comes closest to giving a 500-nm-diameter electron orbit, What is the electron's energy in this state
A certain fluid has a density of 1090 kg/m3 and is observed to rise to a height of 2.3 cm in a 1.0-mm-diameter tube. Calculate the surface tension of the fluid
A uniform 210N ladder rests against a perfectly smooth wall, making a 40.0 degrees angle with the wall. Find the normal forces that the wall exert on the ladder
A member of the volleyball team spikes the ball. During this process, she changes the velocity of the ball from 3.5 m/s, determine the mass of the volleyball
You are using a standard microscope with a 0.10NA 4x objective and switch to a 0.65NA 40x objective. What are the acceptance angles for each
The mass of a robot is 4340 kg. This robot weighs 3000 N more on planet A than it does on planet B. Both planets have the same radius of 2.37 × 107 m
A 295 turn solenoid has a radius of 4.00 cm and a length of 22.0 cm. Find the energy stored in it when the current in its windings is 0.497 A
A spring with constant k = 10 N/m is attached to a block. What is the force on the block by the spring when the spring has been stretched by 0.05 m
A light ray is incident upon a plane interface between two materials. The ray makes an incident angle with the normal to the surface of 30 degrees in a material with index of refraction 1.3. what is the refracted angle (in degrees) in that material
A constant magnetic field of magnitude 0.45 T is directed along the +y axis. The length of each rod is L = 1.3 m, and the speeds are the same, vA = vB = vC = 2.7 m/s. For each rod, find out the magnitude of the motional emf, and indicate which end..
A certain superconducting magnet in the form of a solenoid of length 1.20 m can generate a magnetic field of 11.0 T in its core when its coils carry a current of 145 A. Find the number of turns in the solenoid
q1. an observer moving toward earth with a speed of 0.97 notices that it takes 5min for a person to fill her car with
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