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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?
four positive charges of equal magnitude form the corners of a square. each side of the square has a length of 0.5 m. what is the magnitude of the electric field at the center of the square in n/c
On an air track, a 400 g glider moving to the right at 2.00 m/s collides elastically with a 500 g glider moving in the opposite direction at 3.00 m/s, Find the velocity of second glider after the collision
a store sign of mass 4.21 kg is hung by two wires that each make an angle of ? 42.3deg with the ceiling.what is the
Two charged plates create a potential difference of 190 V. At a point halfway between the plates an electron is released from rest. What was the initial speed and direction of the proton
A solid disk of mass M and radius R is pivoted so that it can rotate about its center. The disk is initially at rest. A ball of mass m and speed v travels along a path tangential to the rim of the disk. The ball sticks to the disk and the assembly..
A 20.0-N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface, What is the force of friction acting on the block
A soft drink (mostly water) flows in a pipe at a beverage plant with a mass flow rate that would fill 220 0.360-L cans per minute. At point 2 in the pipe, the gauge pressure is 155 kPa and the cross-sectional area is 8.00 cm2. At point 1, 1.35 m a..
the position of a particle moving along the x axis is given in centimeters by x 9.13 1.33 t3 where t is in seconds.
An eagle is flying horizontally at 5.7 m/s with a fish in its claws. How much time passes before the fish's speed doubles
two points on a string are observed as a traveling wave passes them. the points are at x1 0 and x2 1 m. the
Two horses pull a large crate of negligible mass at constant speed across a barn floor by means of two light steel cables. What is the work done by each horse if the box is moved a distance of 29 m
A large oak tree produces 2.2 metric tons of wood over a 50 year growth lifespan. find the tree's efficiency for converting solar energy to wood heating value
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