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An elastic cord is 69.3 centimeter long when a weight of 70.2 Newton hangs from it but is 87.1 centimeter long when a weight of 184 Newton hangs from it. Obtain the spring constant of this elastic cord?
A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. Find the distance from the source at which the intensity is 0.80 10?6 W/m2
A fire hose 10 cm in diameter delivers water at the rate of 21kg/s . The hose terminates in a nozzle 2.6cm in diameter. What is the flow speed in the nozzle
An insulated beaker by negligible mass contains liquid water by a mass of 0.315kg and a temperature of 65.8C. How much ice at a temperature of -15.0C should be dropped into the water so that the final temperature of the system will be 28.0C?
An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.2 MJ when the flywheel is rotating at 17,500revolutions per minute
Two identical guitar strings are prepared such that they have the same length (1.91 m) and are under the same amount of tension, What is the wave propagation speed on the guitar strings
A metal sphere of radius 13 cm has a net charge of 2.8 x10–8 C. (a) What is the electricfield at the sphere's surface? (b) If V =0 at infinity, what is the electric potential (in V) at thesphere's surface?
You've been sent to a new planet. In order to determine the planet's free-fall acceleration, At what time is the ball at its maximum height
A speed skater moving across frictionless ice at 8.4 m/ s hits a 5.2 m -wide patch of rough ice. She slows steadily, after that continues on at 6.3 m/s.
A 100 resistor, a 0.100X10^-6 capacitor, and a 0.300H inductor are connected in parallel to a voltage source with amplitude 240V, Find the maximum energy stored in the inductor and in the capacitor at resonance
Which would have a higher kinetic energy , an airplane travellingat the speed of sound or an airplane with half the weight of the first plane and travelling twice the speed of sound ?
Copper has an electrical resistivity %u03C1 = 1.72 x 10-8 %u03A9m. What is the electrical resistance of a copper wire with a radius of 1.0 mm and a length of 25 m
A horizontal force of 35_N is used help push an 44_kg box up a 13_meter incline. What is the work done by this applied force
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