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Squaw Valley ski area in California claims that its lifts can move 45800 persons per hour. If the average lift carries people about 205 meter (vertically) higher, calculate the maximum total power needed. (Suppose an average mass per person of 70 kilogram).
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One end of a 5.0 m long light string is attached to the ceiling and a small rock of mass m is attached to the other end of the string. What is the mass m of the rock
An object is 28.0 cm from the center of a silvered spherical glass Christmas tree ornament 6.50 cm in diameter. What are the position and magnification of its image? (Use the correct sign conventions.) position _______________cm from the surface imag..
for a nitrogen molecule in a 1.00 l cubical boxa. calculate the zpe in jmolecule and jmole.b. calculate difference in
An RLC series circuit has R=1.35 kOhm, L=225 mH, and C=2.50 uF (micro farads) and is connected across a 60 Hz power supply. find the reactances of the capacitor and inductor
Consider the reaction, (2/1)H + (9/4)Be>>>> (7/3)Li + (4/2)He How much energy is liberated? What is the threshold energy for this reaction
When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will ta..
A ball on the porch rolls 60 {rm cm} to the porch's edge, drops 40 {rm cm}, continues rolling on the grass, and eventually stops 80 {rm cm} from the porch's edge.
the motor in a refrigerator has power p. if the freezing compartment is at temperature tl and the outside air is at
A 1245-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1955-N crate hangs from the far end of the beam.
a spring with k=128 Nm is compressed to a distance 2.0 pastequillibrium and is used to project a ball with mass = 4 kgdirectly up. What is muzzle velocity when the spring reaches equillibrium
In an experiment, 300 g of aluminum (with a specific heat of 900 J/kg·K) at 100°C is mixed with 54.0 g of water (4186 J/kg·K) at 20°C, What is the entropy change of the aluminum-water system
A vector is given by Rvec = 1.70 ihat + 2.30 jhat + 2.99 khat. Find the magnitude of Rvec
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