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A fully loaded, slow-moving freight elevator has a cab with a total mass of 1150 kg, which is required to travel upward 49 m in 3.1 min, starting and ending at rest. The elevator's counterweight has a mass of only 1025 kg, and so the elevator motor must help. What average power is required of the force the motor exerts on the cab via the cable?
A horse draws a sled horizontally across a snow-covered field. The coefficient of friction between the sled and the snow is 0.175, and the mass of the sled, what is the power needed to accomplish this
A 1000kg car moving 40m/s skids to a stop. During the skid, the only force is the frictional force between the tires and the road, which is 6000N. find the distance the car moves before coming to a stop
You accidentally drop a pen from 1.1 m above the floor. How long does it take for the pen to reach the floor
question1consider a tube filled with air at 17 degc and closed at both ends. let lengthnbspof the tube is 70 cm.nbsp a
Three small spheres, each have a charge of 3.60 %u03BCC, are arranged in a line, with sphere 2 in the middle. Adjacent spheres are initially 8.70 cm apart. What is the speed of each sphere when they are far apart
An electric power plant that would make use of the temperature gradient in the ocean has been proposed. What is the maximum efficiency of such a system
A fire truck has a siren with that generates a sound with a frequency of 8562 Hz. what frequency will you observe
While a roofer is working on a roof that slants at 43.0 above the horizontal, If it starts 4.60m from the lower edge of the roof, how fast will the toolbox be moving
An inductor is connected to a source of sinusoidally varying voltage with constant amplitude and a frequency of 50.0 Hz. what will be the new rms current
Presume a spherical planet P has a uniform density of 4.72 x 10^3 kg/m^3 and a radius R = 3604km. For a parcel that weighs 64N on the surface of the spherical Earth.
A 50g hard-boiled egg oscillates on a spring with force constant 25N/m. A damping force F=-bv acts on the egg. Calculate the magnitude of the damping constant b
A solenoid is 15 cm long and has 9000 turns. The current through the solenoid is 6A. What is the value of the magnetic field created
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