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Find the percentage variation of the resistivity of copper over the temperature range from room temperature 20oC to 98oC. Suppose that a copper wire's resistance changes due to only resistivity changes over this temperature range. Further assume that it is connected to the same power supply. Find by what percentage would its current change?
A 75 g arrow is fired from a bow whosestring exerts an average force of 95 N on the arrow over a distanceof 76 cm. What is the speed of the arrowas it leaves the bow
An underwater diver sees the sun 58 above horizontal. How high is the sun above horizon to a fisherman in a boat above the diver.
You are driving along a highway at 80 kilometer per hour. Exactly 10 meter in front of you is a truck 15 meter long driving at 60 kilometer per hour, your car is 5 meter long. determine how fast must you accelerate
A shot-putter throws the shot ( mass = 7.3 ) with an initial speed of 14.0 at a 32.0 angle to the horizontal. Calculate the horizontal distance traveled by the shot
Two moons of identical mass are 2000 kilometer apart. If superman pushes one moon away to make the distance 6000 kilometer, Compute the gravitational force between the moons
A sound source emits sounds of frequency 210Hz that travel by still air at 340m/s. The listener moves at 75 m/s relative to still air toward the stationary source. What is wavelength of the sound between the source and the listener.
Current passes through a solution of sodium chloride. in 1.00 secnds, 2.68 x 10^16 Na+ ions arrive at the negative electrode, what is the current in the fluid
The magnetic field perpendicular to a circular wire loop 11.2cm in diameter is changed from +0.50Tto -0.33T in 130ms, In what direction does the induced current flow?
the space shuttle is in a 230 mile high orbit. what are the shuttles orbital period in minutes and its speed
The image of a very distant car is located 18 cm behind a convex mirror. What is the radius of curvature of the mirror
At the time the switch is closed completing a simple LC circuit, the capacitor has 3.4 J of stored energy and the inductor has no stored energy. What is the energy stored in the inductor at that time
The New England Merchants Bank Building in Boston is 152 m high, What is the total distance, side to side, that the top of the building moves during such an oscillation
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