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1. What are some of the reasons that wind-energy capacity is growing at 30-40% per year in Europe? At this rate, how long would it take to double this capacity?
2. Hydrogen fusion converts about 3% of its mass to energy (E=mc^2)when 4 kg of Hydrogen is fused into Helium. Given that water is 1/9 hydrogen by mass, how much water per person would be needed to supply this power assuming that, on average a person in the US uses 82,000 kWh per year?
A) Derive an expression for the moment of inertia of this disk about its center of rotation. B) Find an expression for the period of the resulting simple harmonic motion.
How is the principle on which the Gaussmeter is based related to the motion of the electron perpendicular to a uniform magnetic field?
Hooke's law describes a certain light spring of unstretched length 33.0 cm. When one end is attached to the top of a doorframe and a 7.31 kg object is hung from the other end, the length of the spring is 42.0 cm.
Resistors 1 and 2 are connected to identical batteries, resistor 1 dissipates 4.0 times more power than resistor 2. What is the ratio P1/P2 of their power dissipations if the same current passes through each resistor?
a pendulum with a pendulum length of 1.25 m undergoing SHM of mass 250g just released from an angel of 7 to the vertical. determine the period and frequency of the motion
Wavelengths of light from a distant galaxy are found to be 0.46% longer than the corresponding wavelengths measured in a terrestrial laboratory. What speed is the galaxy receding
A professional golfer is examining a video of a practice swing. The high-speed footage shows that his club is in contact with the ball (which was initially at rest on the tee) for only 0.471 milliseconds, and the radar gun clocks the speed of the ..
a lead wire of cross-sectional area 0.980 mm2 is at a temperature of 2.00 k and carries a current of 0.490 a. a find
The basket is tied to a rope and it is stopped by a fixed clamp when it is falling down, I know there is initial KE however how come initial work is negative. Is not force and displacement are in the same direction, so work must be positive?
A traffic light weighing 120 N hangs from a cable tied to two other cables fastened to a support. Find the tension in each of the three cables
A copper pipe with an outer radius of 0.013 m runs from an outdoorwall faucet into the interior of a house. Find the inner radius of the pipe
A 30.0g ball rolls around the 40.0cm diameter hemishperical track at 60.0rpm. Assume rolling friction is negligible. Determine the ball's linear velocity
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