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While standing near a railroad crossing, you hear a train horn. The frequency emitted by the horn is 350Hz . If the train is traveling at 75 km/hr and the air temperature is 25C , what is the frequency you hear when the train is approaching you? What is the frequency you hear after the train has passed?
Fourteen moles of an ideal monatomic gas expand isothermally at a temperature of 75°C. what is the heat flow into the gas
assume that a scale is in an elevator on earth. what force would the scale exert on a 57.6kg person on it if the
A pilot claims to have seen a UFO moving initially at the speed of about 440 m/s in an easterly direction and then, in a tie interval of only 1.0s turning 45 degrees and moving souutheast at 440 m/s
Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. What was your original speed
A highway curve of radius 500 m is designed for traffic moving at a speed of 90 km/hr. What is the correct banking angle of the road
When the hamster is running in a wheel, the temperature of the air in the calorimeter rises 1.60 per hour. how many grams of seed must the hamster eat per hour to supply this energy
In a series R-L-C circuit, R = 280? , XC = 240?and XL = 600? . The average power consumed in the resistor is 60.0W, What is the power factor of the circuit
You have a pulley 11.8 cm in diameter and with a mass of 1.6 kg. You get to wondering whether the pulley is uniform. What is the moment of inertia if the pulley is uniform
A player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6m/s in 2 seconds. how much force was exerted on puck? how much on the stick.
Three electrons are located at the vertices of an equilateral triangle, one at each vertex, find the magnitude of the net electrostatic force on each electron
(a) Calculate the lowest energy of the electron in He+. Is it lower than that of H.(b) If this electron absorbs a photon and makes a transition to the 2p orbital, what is the frequency of the absorbed photon
A ball thrown straight upward returns to its original level in 2.80 s . A second ball is thrown at an angle of 44.0 degrees above the horizontal. What is the initial speed of the second ball
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