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Suppose you wish to fabricate a uniform wire from 1.80 g of copper. The wire is to have a resistance of R = 0.380 ? and all the copper is to be used.(a) What must be the length of this wire?........... m(b) What must be the diameter of this wire?
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 4.57 m/s relative to the ground. How fast is the train moving
A circuit is powered by a 12.0 V battery in series with R1=25 ohms A second set of resistors R2= 75 ohms, What is the voltage drop across the 75 ohm resistor
Calculate the mass of a solid gold rectangular bar that has dimensions lwh = 4.20 cm 12.0 cm 29.0 cm. (The density of gold is 19.3 103 kg/m3.
A 87 arrow is fired from a bow whose string exerts an average force of 120N on the arrow over a distance of 78cm. Evaluate the speed of the arrow as it leaves the bow?
A particular Bohr orbit in a hydrogen atom has a total energy of -0.54eV. What is the electric potential energy of the system
Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.013 m. Water enters the hydrant through an underground pipe of radius 0.094 m. In this pipe the water has a speed of 3.2 m/s.
Suppose 28.5 kg of 87.5°C water is placed in contact with 28.5 kg of 11°C water. What is the change in heat (in J) of the hot water
A certain camera has f-numbers that range from 1.1 to 28. If the focal length of the lens is 40 mm, what is the range of aperture diameters for the camera
A visual binary has a parallax of 0.4" (arcsec), a maximum separation (in arcsec) of a=6.0", and an orbital period P=80 y. What is the total mass of the binary system
What is torque exerted by the fish about an axis
A suspension bridge is 60.0 m above the level base of a gorge. A stone is thrown or dropped from the bridge. Neglect air resistance. Let g = 10.0 m/s2. how long does it take for it to fall to the base of the gorge
A 37.6 kg crate rests on a horizontal floor, and a 76.1 kg person is standing on the crate. Determine the magnitude of the normal force
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