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What diameter should a copper wire have if its resistance is to be the same as that of an equal length of aluminium wire with diameter 3.52mm?
The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction and, while both are passing overhead, determine the speed of the faster spaceship
a car is traveling over a hill. if using a cartesian coordinate system with origin o at the top of the hill the hills
A LASIK vision correction system uses a laser that emits 10 -long pulses of light, each with 2.5 of energy. The laser is focused to a 0.90 -diameter circle. What is the average power of each laser pulse
a ball of mass 0.203 kg has a velocity of 1.43 ms right a ball of mass 0.291 kg has a velocity of 0.396 ms left. they
A circular curve of highway is designed for traffic moving at 55 km/h. If the radius of the curve is 120 m, what is the correct angle of banking of the road
Consider two solid conducting spheres of radii r1 = 2 cm and r2 = 3 cm. Sphere 1 initially carries a net charge of +6 ?C, What is the voltage at the surface of sphere 1? What is the net charge on sphere 1? On sphere 2
A ball of mass 5.8 kg and radius 13 cm rolls without slipping horizontally at 5.6 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring
When a diver jumps into the ocean, water leaks into the gap region between the diver's skin and her wetsuit, estimate how much energy (in units of candy bars = 300 kcal) is required by this heating process
The propulsion system on a 1500kg rocket car fires for 15 seconds and the propulsion force is equal to F= x(80-x). What is the average speed for the entire two stage event
a student calculates the unknown liquid to have a density of 0.87 gcm3. if the class average for the density of the
A boat moves 15 .0 km across a lake in 30.0 min. What is the average speed of the boat in kilometers per hour
Calculate the magnitude of the gravitational force exerted on a 611-kg satellite that is a distance of two earth radii from the center of the earth, What is the magnitude of the earth's acceleration
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