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How many square meters of PV would it take to provide 1 kW for a world population of 6 billion? If these cells were crystalline silicon of 200 microns thick(200*10^-6), what is the minimum mass of silicon material needed for this venture? (Density of silicon=2330kg/m^3)
A block of wood has a mass of 3.87 kg and a density of 584 kg/m3. It is to be loaded with lead so that it will float in water with 0.84 of its volume immersed. What mass of lead is needed if the lead is on top of the wood
a rod 14.0 cm long is uniformly charged and has a total charge of 22.0 c. determine a the magnitude and b the direction
A girl is standing at the edge of a cliff 145 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.79 m/s. How long does it take the rock to hit the ground
A 25 kg child on a swing 2m long is released from rest whenthe swing supports make an angle of 30 degrees with thevertical. find the child's speed at the lowest position of the swing
an experimental measurement has a result 4.95plusmn.01 and a predict value of 5.00. what is the percentage deviation
A bat at rest sends out ultrasonic sound waves at 52.3 kHz and receives them returned from an object moving directly away from it at 29.7 m/s. What is the received sound frequency
Suppose the rotational kinetic energy of a solid disc is 1000 J when the disk has an angular velocity of 3 rad/s. What is the disk's moment of inertia
A 70.0kg man jumps 1.00 m down onto a concrete walkway. Hisdownward motion stops in 0.0200 seconds. If he forgets tobend his knees, what force is transmitted to his leg bones
Calculate the moment of inertia of a skater given the following information. THe 65 kg skater is approximated as a cylinder that has a .110 m radius
A 0.056 kg aluminum bullet traveling at 462 m/s strikes an armor plate and comes to a stop. what is the bullet's temperature change in degrees Celsius
Coulomb's Law A)When spheres are charged with a power supply, what is being controlled? How does this lead to a charge on the spheres? B)Why is it necessary to separate spheres as much as possible before charging them?
Dirty Harry is attempting to apprehend a dangerous criminal in a cheese shop, What is the magnitude of the Gouda's velocity after being struck by the bullet
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