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A hoist is powered by an electric motor that draws 4.82 kilowatts of electric power. The system is 59.2% efficient (i.e., 5.92% of electric power is actually used to lift the load, the rest being wasted heat, the weight of the lifting ropes and pulleys, etc.) How long will it take this hoist to lift a 2550 kg mass to the top of a 75.4 m high building?
Water at a gauge pressure of 3.0 atm at street level flows into an office building at the speed of 0.40 m/s by a pipe 5.0 cm in diameter. The pipe tapers down to 2.20 cm in diameter by the top floor, 15 m above, where the faucet has been left open. E..
One afternoon, you are playing on a wooden basketball court with a hula?hoop to amuse yourself. The hoop has a mass of 500g and a radius of 55 cm. What is the hoop's speed just before it hits the wall
Show that the uncertainty principle can be expressed in the form ΔL Δθ is greater or equals to h/2 where θ is an angle and L is the angular momentum. for what uncerainty in the angular momentum will the angular position of a particle be completely un..
Determine the direction of the net electrostatic force on charge q3 (angle with respect to the positive x-axis).
A 240 kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, each having a 1.20, Calculate the power dissipated by 100 of them.
A kicker punts a football from the very center of the field to the sideline 36 yards downfield. What is the direction of the net displacement of the ball
You melted a copper cylinder of volume 15.0 cm3 to fabricate a thin wire of diameter 0.02 mm. What will be the length of wire formed
An insulated Thermos contains 119 cm3 of hot coffee at 64 °C. You put a 12g ice cube at its melting point to cool the coffee. By how a lot of degrees have your coffee cooled once the ice has melted and equilibrium is reached.
Calculate the period of the square wave (in milliseconds) to which the function generator is to be set in order five 1/e-times of the RC circuit to be accommodated into one half of the square wave
A reversible isochore from an equilibrium state at P1= 1 bar, t1=100C to an equilibrium state at t2=300C followed by a adiabatic isentropic expansion to P3=1 bar, Find the thermal efficiency of the cycle
An electron moves in a circular path perpendicular to the constant magnetic field with a magnitude of 2.00 mT. The angular momentum of the electron about the center of the circle is 5.50 multiplied by 10-25 J•s.
Two long, parallel wires are separated by a distance of 3.40. The force per unit length that each wire exerts on the other is 3.20×10-5, and the wires repel each other. The current in one wire is 0.6690.
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