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A snow maker at a resort pumps 140 kilogram of lake water per minute and sprays it into the air above a ski run. The water droplets freeze in the air and fall to the ground, forming a layer of snow. If all of the water pumped into the air turns to snow, and the snow cools to the ambient air temperature of -8.2°C, find how much heat does snow making process release each minute? Suppose the temperature of the lake water is 11.6°C, and use 2.00 x 103 J/(kgoC) for the specific heat capacity of snow.
A 36.4 kg child starting from rest slides down a water slide with the vertical height of 20.7 m. (Neglect friction.) What is the child's speed three-quarters of the way down.
An 8.40 gram bullet has a speed of 1.13 km/s. Determine what is its kinetic energy in joules
A hopper drops gravel at a rate of 75kg/s onto a belt that moves by constant velocity v=2.2m/s. What is the additional force (over and above internal friction) required to keep the conveyor belt moving as gravel falls onto it?
This question has to do with the oil drop experiment and how much voltage must be applied to keep a drop suspended in air. how much voltage must be used to keep the oil drop suspended
A "diving bell" is a tube or pipe that is closed at the top and open at the bottom. It is lowered into a body of water with the open end down so that air is trapped inside, Find the absolute pressure of the air in the bell
A single bead can slide with negligible friction on a wire
A 2.00 m long rope is stretched between two supports with a tension that makes the speed of transverse waves 48.0 m/s. What are the wavelength of the second overtone
A proton with a speed of 7.500E+5 m/s orbits justoutside a uniformly charged sphere of radius 7.50 cm. What isthe charge on the sphere?
A metal slug is dropped from a height of 1/20 RM above the moon's surface. Find the speed with which the slug strikes the moon's surface
A 2000-kg elevator is rising and its speed is increasing at 4 m/s^2. What is the tension in the elevator cable
A 2-g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1É C. Estimate the fraction of the ball’s electrons that have been removed. Suppose that the ball has 1 gram of neutrons, 1 gram of protons, and as many electrons as ..
An automobile and a truck start from rest at the same instant, withthe automobile initially at some distance behind the truck. The truck has a constant acceleration of 2.04 m/s^2, and the automobile an accelerationof 3.30 m/s^2. The automobile ove..
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