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The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density of course, become less with altitude. But suppose the density of air were a constant 1.2 kg/m^3. Calculate where the top of the atmosphere would be.
A car moving with an initial speed v collides with a second stationary car that is 49.0 percent as massive. Calculate the final speed of the second car
what is the compressional stress that the arm withstands during the crash?
A cube with edge 3.0 cm floats with 2/3 of its volume below the surface of the water. What is the mass of the block
The metallic sphere on top of a large van de Graaf generator has a radius of 2.0 m. Suppose that the sphere carries a charge of 3x10-5 C. How much energy is stored in this device
A college student is working on her physics homework in her dorm room. Her room contains a total of gas molecules. As she works, her body is converting chemical energy into thermal energy at a rate of 125 . If her dorm room were an isolated system (d..
Two large parallel metal plates are 1.4 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. what is the electric field (in V/m) in the region between the plates
q1. a 60kg ball of clay is thrown horizontally at 40 ms toward a 1.6kg block sitting at rest on a frictionless hi
As a new electrical engineer for the local power company, you are assigned the project of designing a generator of sinusoidal ac voltage with a maximum voltage of 120 {\rm V}. What is the minimum rotation rate of the coil so it will produce the req..
A cubic foot of lead that weighs 700 lb is submerged in water. What is the buoyant force acting on it? The volume of one cubic foot of water weighs 62.4 lb
A box loaded with books (mass=25.4kg) is being dragged across a frozen pond by a rope at an angle of 14.7degrees above the horizontal. Find the change in the box's kinetic energy
Suppose you wish to survey 16000 square degrees of the sky to some limiting brightness as fast as possible, but necessarily within some budgetary constraints. Further suppose that the cost of telescopes ~ (diameter of the primary mirror)2.5 and th..
If the perceived frequency becomes constant at 440 Hz, what is terminal speed at the paratrooper? Take the speed sound in air to be 343 m/s and assume the paratrooper always remains below the helicopter.
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