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A train is traveling at 30.0 relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 . The speed of sound in air should be taken as 344 . What frequency is heard by a passenger on a train moving at a speed of 18.0 relative to the ground in a direction opposite to the first train and approaching it? Express your answer in hertz. What frequency is heard by a passenger on a train moving at a speed of 18.0 relative to the ground in a direction opposite to the first train and receding from it? Express your answer in hertz.
Two 10-cm-diameter charged rings face each other, 18.0cm apart. Both rings are charged to + 50.0nC . What is the electric field strength at the center of the left ring
A 2.38 mol sample of an ideal gas expands reversibly and isothermally at 278 K until its volume is doubled. What is the increase in entropy of the gas
1) Compute the change in the internal energy of a thermodynamic system under the following scenarios: (i) 50 J of heat added and 40 J work extracted, (ii) 50 J of heat added and 75 J work extracted,
A 2000 kg car traveling at a speed of 23m/s skids to the halt on wet concrete where = 0.60. How long are the skid marks.
A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator
A 38.0-kg child swings in a swing supported by two chains, each 2.90 m long. The tension in each chain at the lowest point is 418 N. Find the child's speed at the lowest point
A 2 kg mass dropped 2.0 m above a spring with a spring constant of 40.0 N/m. How much does the spring compress
What is the maximum height the rocket reaches. How long is the rocket in the air.
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 60.0 degrees above the horizontal. The rocket is fired toward the ground 11.0-m high wall, which is located 27.0 m away. By how much does the rocket clear the top of the wa..
The maximum electric field 8.3 m from a point light source is2.3 V/m. What is the power of the source
Three infinite nonconducting sheets, with uniform positive surface charge densities, sigma, 2sigma, and 3sigma, are arranged to be parallel. What is their order, from left to right
A hot-air balloon has a volume of 2741 m3. The density of the air outside the balloon is 1.205 kg/m3. How much weight can the balloon lift
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