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A steep cliff west of Lydia's home reflects a 980-kHz radio signal from a station that is 68 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180° phase shift when the wave reflects from the cliff.
one specific federal funding organization for scientific research and education is the national science foundation nsf.
A 16.0L tank contains 0.430kg of helium at 16.0?C. The molar mass of helium is 4.00g/mol, How many moles of helium are in the tank
A uniform ion beam of radius R consists if N' ions per meter ofmass m, speed v, and charge q. Find the Lorentz force (due toboth E and B) on an ion at the edge of the beam. At what speed would the force become zero?
An object with mass 3.8{\rm kg} is attached to a spring with spring stiffness constant 220{\rm N/m} and is executing simple harmonic motion. When the object is 2.1×10?2{\rm m} from its equilibrium position, it is moving with a speed of 0.55 {\rm m..
Suppose a cart was given a push down a ramp, starting at the end close to the motion detector, Describe what the acceleration vs. time graph will look like for this case, Explain why the two graphs would be the same or different
Consider a star of mass M=10Msun, composed entirely of fully ionized C-12. Its core temperature is 6*10^8K. Suppose the star produces energy via the reaction C12 + C12 --> Mg24. the atomic weight of C12 is 12, and that of Mg24 is 23.985. What fractio..
1 the scientific method is used by scientists to understand the natural laws that the universe obeys. scientists are
4. A ball is kicked toward a fence from a point 32 meters away. The velocity of the ball as it leaves the kicker's foot is 24 m/s at an angle of 37 degrees above the horizontal. The top of the fence is 2.0 meters high. Assuming air resistan..
Two concrete spans of a 190 m long bridge are placed end to end so that no room is allowed for expansion. what is the height y to which the spans rise when they buckle
A large cruise ship of mass 6.80 107 kg has a speed of 12.8 m/s at some instant. what is the ship's kinetic energy at this time
At 0.0° C and 1.00 atm, 0.80 mol of a gas occupies a volume of 0.0179 m3. Estimate the average distance between the gas molecules
A monatomic ideal gas expands on a linear process such that P=3V + P1 ( initial pressure.) P1 and V1 are the initial pressure and initial volume
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