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Squaw Valley ski area in California claims that its lifts can move 48300 people per hour. If the average lift carries people about 210 m (vertically) higher, estimate the maximum total power needed. (Assume an average mass per person of 70 kg.)
A small immersion heater is rated at 350 W. Estimate how long it would take a heat a cup of soup (assume this is 250 mL of water) from 20C to 60C.
A drunk driver in a 1600 kg car plows into a 1500 kg parked car with its brake set. Police measurements show that the two cars skid together a distance of 19 m before stopping. If the effective coefficient of friction is 0.78, how fast was the dru..
You are holding a compass 3.50 m from a long straight electrical supply wire that is carrying a direct current perpendicularly to the local direction of the Earth's magnetic field. find the magnitude of the current carried by the wire
Find out the velocity with which he strikes the water.
Suppose you have an electric hot water heater for your house which is an aluminum cylinder which has a 0.46 m radius and is 2 m high. How much energy is lost through the walls of the hot water heater
I hold a flat mirror 24.6 cm in front of my face. There is a freckle on my face 1 mm in diameter. Find the angular size of the freckle on the image of my face as viewed by my eye
The internal energy of a gas is 1000 J. The gas is compressed adiabatically, and its volume decreases by 500 cm3. what is the internal energy of the gas
A light bulb is wired in series with a 131-? resistor, and they are connected across a 120-V source. What are the two possible resistances of the light bulb
The speed of oxygenated blood in the artery of a healthy person is measured to be 0.12 m/s. by what percent has the artery area been blocked by plaque
What is the longest wavelength of light that can be absorbed by a hydrogen atom that is initially in the first excited state
Water is moving at a speed of 7.55 m/s through a fire hose with an internal diameter of 5.99 cm. What is the diameter of the nozzle
A point charge Q = 8.50×10-6 C is at the center of a conducting spherical shell of radius R = 17.90 cm. What is the field just outside the shell
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