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An 80-cm-long wire is made by welding a 1.2 mm-diameter, 20-cm-long copper wire to a1.2 mm-diameter, 60-cm-long iron wire. What is theresistance of the composite wire?
an object attached to a horizontal spring is oscillating back and forth along a frictionless surface. the maximum speed
A child slides down a snow covered slope that makes an angle of 20 degrees with the horizontal. At what angle would the child slide with constant speed
In a graphing calculator, there are four AAA batteries, which together provide a potential difference of 1.5 V and a total of 6.0 W·h of energy. what was the average current through the calculator
A uniform electric field of magnitude 324 N/C is directed along the +y-axis. A 5.90 µC charge moves from the origin to the point (x, y) = (-20 cm, -35 cm). What is the change in the potential energy associated with this charge?
An electron enters a region of a uniform electric field (E= 50 N/C) with an initial velocity of 40Km/s directed the same as the electric field. what is the speed of the electron 1.5ns after entering this region?
questiona high-speed flywheel in a motor is spinning at 450 rpm when a power failure rapidly occurs. a flywheel has
Write down the expression for net torque
A mechanic pushes a 2.4 103 kg car from rest to a speed of v, doing 5100 J of work in the process. During this time, the car moves 29.0 m. find the speed v and horizontal force exerted on the car
Explain, using thermodynamically sound principles, what each of the following temperatures represents: actual temperature, virtual temperature, dewpoint temperature,
When mass M is at the position shown, it is sliding down theinclined part of a slide at a speed of 1.89 m/s. find the coefficient of kinetic friction for the mass on the surface
Calculate the probability of finding the electron in the ground state of hydrogen at less than one Bohr radius from the nucleus
An object of mass m = 3.1 g and charge q = +48 μc is attached to a string and placed in a uniform electric field that is inclined at an angle of 30 degrees with the horizontal. The object is in static equilibrium when the string is horizontal.
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