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A hollow metal sphere is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?
A 73 gram ice cube at 0°C is heated until 64 gram has become water at 100°C and 9.0 gram has become steam at 100°C. Find how much energy was added to accomplish the transformation
a 35 kg boy sits atop a sphere of frictionless ice of radius r=2.0m. He begins to slide and eventually falls off. How far above the ground does he lose contact with the ice
A neon sign in a shop operates at around 12 kV (rms). A transformer is to step-up the 120 V (rms) line voltage to that value. How many turns must be placed into the primary coil
calculate the heat needed at 0 degrees celcius to make the following change of state kilocalories to melt 140 g of
Ability to grow in shade may help pines found in the dry forests of Arizona resist drought. How well do these pines grow in shade? Plant pine seedlings in a greenhouse in either full light, light reduced to 25% of normal by shade cloth
A 3.00- length of copper wire at 20 has a 1.20--long section with diameter 1.8 and a 1.80--long section with diameter 0.90 . There is a current of 2.5 in the 1.8 -diameter section. What is the current in the 0.90 -diameter section? What is the magnit..
cygnus a is an elliptical galaxy with an active nucleus from where two jets come out. the luminosity of the jets is
Dan is moving a duffel bag across a carpeted floor that weighs as much as he does (60kg). He pulls with a force of 200N to get the bag to start moving. What is the coefficient of static friction between the duffel bag and the carpet?
A 72-kg base runner begins his slide into second base when he is moving at a speed of 3.9 m/s. How far does he slide
Find what is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 44 revolutions per minute if the wheel's diameter is 30 centimeter
A 2900 cm3 container holds 0.15mol of helium gas at 340 μC. How much work must be done to compress the gas
A 100kg box slides down a ramp that has 60.0degrees slope. The coefficient of kinetic friction between the box and the ramp is 0.250. What is the work done by the gravitational force
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