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Suppose a fuel-cell generator was used to produce electricity for a house. If eachH2molecule produces 2e-, how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, which corresponds to approximately of electrons at the voltage of a fuel cell. 2.65*104
Two sources produce electromagnetic waves. What is the energy of a photon from source B
A 9.5-kg monkey is hanging by one arm from a branch and is swinging on a vertical circle. Find the magnitude of the tension in the monkey's arm
A model of a red blood cell portrays the cell as a spherical capacitor, a positively charged liquid sphere of surface area A separated from the surrounding negatively charged fluid by a membrane of thickness t. estimate the volume of the cell
A railroad hopper car has a mass of 50000 kg when empty and contains 50000 kg of coal. How fast does the car travel after all the coal is dumped
A mercury barometer reads 750 mm on the roof of a building and 766 mm on the ground. Assuming a constant value of 1.29 kg/m3 for the density of air, determine the height of the building
A 5.61-mm-high firefly sits on the axis of, and 10.3 cm in front of, the thin lens A, whose focal length is 6.99 cm. Is this image upright or inverted with respect to the firefly
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
In a tennis serve, a 0.073-kg ball can be accelerated from rest to 41 m/s over a distance of 0.95 m. Find the magnitude of the average force exerted by the racket
A 250 g block is dropped onto a relaxed vertical spring that has a spring constant of k = 3.5 N/cm, What is the speed of the block just before it hits the spring
What is velocity of wind that is moving the plane
A person pulls a toboggan for a distance of 27.5 m along the snow with a rope directed 26.2 ° above the snow. The tension in the rope is 92.3 N. How much work is done on the toboggan by the tension force
two wires are welded together end to end. the wires are made of the same material, but the diameter of one is twice that of the other. what is the length of the thick wire
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