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A 200 kg bucket of cement is accelerated upward by a force of 2200 N. the acceleration continues for 5 s. the power needed at the end of this period is.
Two long parallel wires are 6cm apart and carry currents of 3 and 9amps resepctively in opposite directions
Two small metallic spheres, each of mass m = 0.25 g, are suspended as pendulums by light strings from a common point as, compute the magnitude of the charge on each sphere
A transformer is to be used to provide power for a computer disk drive that needs 6.6 V (rms) instead of the 120 V (rms) from the wall outlet. Find the number of turns in the secondary
Two infinite parallel plates separated by distance S are at potentials 0 and V0. What are the charge densities on the plates
A person walks first at a constant speed of 4.80 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.75 m/s. What is her average velocity over the entire trip
Two thin rods of length L are rotating with the same angular speed ? (in rad/s) about axes that pass perpendicularly through one end. Find the kinetic energies of rod A with its attached particle and of rod B
You have a 1.91-m-long stretched string with a mass of 19.3 g. When you oscillate the string at 440 Hz, obtain the tension in the string
Two metal spheres, each of mass 14 g and initially at rest, are dropped from a height of 6 m in an evacuated chamber. Find the difference in final speeds of the two spheres
A certain type of laser emits light that has a frequency of 4.9 × 1014 Hz. How many wavelengths are there in one pulse
A tennis ball is hit with a vertical speed of 30 m/s and a horizontal speed of 25 m/s. How long will the ball remain in the air? How far will it travel horizontally during this time?
On a cool morning, when the temperature is 15deg Celsius, you measure the pressure in your car tires to be 30 psi. After driving 20 mi on the freeway, temperature of your tires is 45 deg Celsius. What pressure will your tire gauge now show.
The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. For comparison, determine the weight of a jetliner whose mass is 6.04 × 105 kg
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