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A certain laboratory experiment requires an aluminum wire of length of 22.0 m and a resistance of 2.40 ? at 20.0°C. What diameter wire must be used? (The resistivity of aluminum at 20.0°C is 2.82 10-8 ? · m.)
mm
You shoot an arrow into the air. Two seconds later arrow has gone straight upward to a height of 30 meters above its launch point. a) What was the arrow's initial speed? b) How long did it take for the arrow to first reach a height of 15 meters ab..
A lense with a circular aperture of 1cm in diameter is just barely capable of serperating two objects, What's the wavelength of the light from the two objects
A sheet of glass is coated with a 500nm -thick layer of oil (n = 1.42). What is the color of reflected light
The speed of a passenger train is 16mph faster than the speed of a frieght train. The passenger train travels 330 miles in the same time it takes the frieght train to travel 250miles. find the speed of each train.
Velocity has a magnitude and a vector. consider a boat moving initally with velocity of 30 m/s directly west. What is the change in velocity
Halley's comet, which passes around the Sun every 76 years, hasan elliptical orbit. When closest to the Sun (perihelion) it is ata distance of 8.823 x 1010 m, Calculate its speed at aphelion
A perfectly insulated system has work done by it at a rate of 13 W. At what rate is the internal energy of the system changing?
Suppose a meteor of mass 3.40 1013 kg is moving at 31.0 km/s relative to the center of the Earth and strikes the Earth. What is the change in the angular speed of the Earth due to this collision
Two identical metallic blocks are connected by a light spring having the spring constant 100 N/m and an unstretched length of .30 m. A total charge Q is slowly placed on the system, causing the spring to stretch to an equilibrium length of .40 m. ..
A circuit consists of one DC power supply providing 20 V and four resistors R1 = 10 Ohm, R2 = 20 Ohm, R3 = R4 = 40 Ohm. Calculate the total power provided by the power supply
As an electron moves through a region of space , its speed decreases from 8*10^6 m/s to 3*10^6 m/s. Through what potential difference did the electron move
Spark plugs should be tightened to a specified torque of 13.8Nm. You have a wrench that is 0.25 m long, What force must you exert on the wrench
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