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The waves from a radio station can reach a home by two different paths. One is a straight-line path from the transmitter to the home, a distance of 30.0 km. The second path is by reflection from a storm cloud at an unknown height that is midway between the transmitter and the home. If the wavelength of the radio broadcast by the radio station is 400 m and there is a phase change upon reflection from the cloud, find the minimum height of the storm cloud that will produce destructive interference between the direct and reflected beams. The answer is 2.46*10^3 km. Please show the work and any formulas used.
A popular pastime is to see who can push an object closest to the edge of a table without its going off. If the coefficient of kinetic friction is 0.400, what was the object's speed as you released it
An electron that has an energy of approximately 62 eV moves between rigid walls 1.4 nm apart. Find the quantum number n for the energy state that the electron occupies.
A battery has Vemf = 12.0 V and internal resistance r = 1.21. What resistance, R, can be put across the battery to extract 10.7 W of power from it?
q1. a vertical spring with a spring constant of 370 nm is mounted on the floor. from directly above the spring which is
Two tiny conducting spheres are identical and carry charges of -17.9C and +65.9C. They are separated by a distance of 2.15 cm. what is the magnitude of the force that each sphere experiences?
A 250 - ? resistor is connected in series with a 4.80 - ?Fcapacitor. The voltage across the capacitor is vC=(7.60V)?sin[(120rad/s) t ]. Derive an expression for the voltage VR across the resistor
Consider the circuit in the diagram, with six identical bulbs, three switches, and a battery. For the state with switches 2 and 3 closed, 1 open, rank the bulbs in the order from brightest to dimmest.
A man of 50.0 kg mass is in equilibrium among two parallel plates. The man is charged up to + 130. mC of charge. The plates are 1.75 meters apart. What is the value of the electric field among the plates? What is the potential difference among the pl..
Two long parallel wires are 6cm apart and carry currents of 3 and 9 amps respectively in opposite directions. Calculate the force among the wires per meter of length wire
charge is placed on two conducting spheres that are very far apart and connected by a long thin wire. the radius of the
You take some data with Nichrome wire and you have a plot of R vs. LA-1 with the following equation from your computer y = 0.943x + 0.3. What resistance will you probably measure for the entire length of wire
After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 52.0 cm. The explorer finds that the pendulum completes 93.0 full swing cycles in a time of127 s. What is the value of the acceleration of gravity on this ..
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