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The waves from a radio station can reach a home receiver by two paths. One is a straight-line path from transmitter to home, a distance of 22.0 km. The second path is by reflection from the ionosphere (a layer of ionized air molecules high in the atmosphere). Assume this reflection takes place at a point midway between receiver and transmitter and that the wavelength broadcast by the radio station is 340 m. Find the minimum height of the ionospheric layer that could produce destructive interference between the direct and reflected beams. (Assume that no phase changes occur on reflection.)
A copper kettle contains water at 22.8° C. When the water is heated to its boiling point, Determine the volume of the kettle at 22.8° C
An object is 20 cm to the left of a lens of focal length 10 cm. What is the distance between the original object and the final image
On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s, What are the magnitude and direction of the velocity of the red glider after the collision
A 1.0- kg mass is attached to a string wrapped around a shaft of negligible mass and having a 7.0- cm radius. How far apart are the masses of the dumbbell
A 42.0 kg seal at an amusement park slides from rest down a ramp into the pool below. If the seal reaches the water with a speed of 4.30 m/s, what is the work done by kinetic friction
The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. Explain how high does the top of the ice block float above the water level?
A spring (k = 1000 N/m) is used to launch objects across the floor. If the spring launches a 380 gram toy car with a speed of 17.6 m/s, how far was the spring compressed
Mandy is walking at a speed of 1.37 m/s directly toward one siren and directly away from another siren when they both begin to sound with a frequency of 650 Hz
Considering the equation for heat transfer through a wall, describe two simple ways to modify ahome to decrease the rate at which heat is lost through the walls.
A diagnostic ultrasound echo is reflected from moving blood and returns with a frequency 314 Hz higher than its original 2.00 MHz. What is the velocity of the blood
A spherical balloon is partially blown up and its surface area is measured. More air is then added, by what factor does the radius of the balloon change
At an outdoor market, a bunch of bananas attached to the bottom of a vertical spring of force constant 16.0 N/m, What is the weight of the bananas in newtons
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