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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)
Raindrops fall 1500 m from a cloud to the ground. If they were not slowed by air resistance, how fast would the drops be moving
An electron in a vaccuum is first accelerated by a voltage of 10,000 volts, find the force of the electron due to the magnetic field
a gold nucleus has a radius of 7.3 x10-15 m and a charge of 79e. through what voltage must an alpha-particle with its
Ice of mass 45.5 g at -10.9° C is added to 212 g of water at 15.8° C in a 101 g glass container of specific heat 0.200 cal/g-°C at an initial temperature of 22.7° C
At the end of the run, she is 175 m away from the starting point at an angle of 15.0° north of west. Illustrate what were the direction and length of her second displacement? Use graphical techniques.
a diver springs upward with an initial speed of 1.9 ms from a 2.5 m board.a find the velocity with which he strikes the
In an English carnival game, you throw a ball at a coconut on a stand 4.0 m in front of you and 1.0 m above the point at which you release the ball. How long is the ball in the air in each case
a simple 1.5 m pendulum oscillates on earth where the acceleration due to gravity is 9.79 m/s^2. How many oscillations will it make in 5 minutes
A 500- kg ice boat moves on runners on essentially frictionless ice. A steady wind blows, What was the force due to the wind
a randomized trial is conducted to evaluate the efficacy of a new cholesterol lowering medication. the primary
A 1 170.0 kg car traveling initially with a speed of 25.000 m/s in an easterly direction crashes into the back of a 9 800.0 kg truck moving in the same direction at 20.000 m/s. What is the change in mechanical energy of the car-truck system
A copper wire, whose cross-sectional area is 5.22 x 10-6 m2, has a linear density of 5.86 x 10-3 kg/m and is strung between two walls. At the ambient temperature, a transverse wave travels with a speed of 43.1 m/s on this wire. The coefficient of ..
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