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Watch the video titled "Why We Need Rare Earth Elements" identify at least one 1 challenge that is associated with mining rare earth elements. Suggest one way for the government to mitigate the challenge in question. Fresh water is vital resource. Is it possible to use icebergs as a source of freshwater? What obstacles technological, social, environmental &a political do you foresee for such an endeavor?
A certain lightbulb has a tungsten filament having a resistance of 16 ? at 22°C and 155 ? when hot. Find the temperature of the filament when it is hot
The magnetic force exerted on a 1.3 - m segment of straight wire is 1.6 N. The wire carries a current of 3.1 A in a region with a constant magnetic field of 0.52 T. What is the angle between the wire and the magnetic field?
A laboratory technician drops a 0.0850-kg sample of unknown material, at a temperature of 100C , into a calorimeter. The calorimeter can, Compute the specific heat capacity of the sample
Discuss what the slope and y-intercept represent (velocity vs time graph). Predict whether either of these quantities would change if you were to drop the picket fence through the photogate from a higher point.
A Styrofoam calorimeter contains 40.0g of water at 50°C. To this we add 2.0g of ice at initial temperature of 0°C. How much heat (in calories) is needed to melt the ice
When a current flows in an aluminum wire of diameter 2.13 mm, the drift speed of the conduction electrons is 1.83 × 10-4 m/s. What is the electron current in the wire
A 62-kg skier speeds down a trail. The surface is smooth and inclined at an angle of 22 with the horizontal. Determine the normal force acting on the skier
A bottle has a mass of 35.00 g when empty and 98.44 g when filled with water. When filled with another fluid, the mass is 88.78 g. What is the specific gravity of this other fluid
A spool of thin wire rotates without friction about its axis. A man pulls down on the wire with force of 13.9N. How long does it take to increase the angular velocity of the spool from 13.0rad/s to 35.0rad/s?
What is the maximum speed with which a 1350kg car can round a turn of radius 71m on a flat road if coefficient of static friction between tires and road is 0.40.
Galaxies form by gravitational collapse of regions that are denser than average. Noting that the present day average mass density of the universe is ρ = 3 × 10-30 g/cm-3, estimate how long it takes for a galaxy to collapse.
A football quaterback runs 15.0 m staright down the playing field in 2.50s. what are the average velocities for the three intervals
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