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A car is parked 21.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 50.0 m/s. The train sounds a short blast of its 309-Hz horn when it reaches a point 18.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component of the train's velocity that is directed towards the car affects the frequency heard by the driver.)
Two parallel plates each of area 7.00 cm^2 are seperated by 3.50 mm of water The electric field between the plates has a magnitude of 2290 N/C, what is the charge stored on each plate
Treat a Boron atom as 5 protons at the origin, 2 electrons spread uniformly on a shell (radius 13.2[pm] centered on the origin) , 2 more electrons spread on a shell (radius 105.8[pm] centered on the origin), and its outer electron at x= 211.6 pm.
The rod is held in the horizontal position shown and then released. Compute the initial acceleration of the mass attached to l1. Assume up is positive and down is negative
You push with a 20 N horizontal force on a 2 kg mass resting on a horizontal suface against a horizonatal friction forces of 12N. What is the accerlation.
An electron is projected vertically upward with a speed of 1.65x10^6 m/s into a uniform magnetic field of 0.160 T that is directed horizontally away from the observer. What would the radius of the circle be.
A 0.15g honeybee acquires a charge of 21pCwhile flying, What is the ratio of the electric force on the bee tot he bee's weight and What electric field strength and direction would allow the bee to hang suspended in the air
The isotope, tritium, has a half-life of 12.3 years. Assume we have 12 kg of the substance. How much tritium will be left after 26years? State your answer in kg ( two decimal places)
Old naval ships fired 10kg cannon balls from a 250 kg cannon. It was very important to stop the recoil of the cannon, as otherwise the heavy cannon would go careening across the deck of the ship.
Calculate the value of the error (only) with two decimal places for: (5.3 +/- 0.1) / (2.9 +/- 0.1) and (7.3 +/- 0.4) / (3 +/- 0.2)
What would be apparent speed of the spacecraft image
A car starts from rest and accletation uniformly for 10s to a velocity of 8m/s. Find the value of accleration, retardation and total time taken
In reality, the COP of the heat pump will only be 60 percent of the ideal value. What is the minimum power of the electric motor when the COP is 60 percent of the ideal value
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