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An energy-efficient lightbulb, taking in 24.0 W of power, can produce the same level of brightness as a conventional lightbulb operating at power 100 W. The lifetime of the energy-efficient bulb is 10 000 h and its purchase price is $4.20, whereas the conventional bulb has lifetime 750 h and costs $0.50 per bulb. Determine the total savings obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. Assume an energy cost of $0.20 per kilowatt-hour.$
A comet with a mass of 7.75 1011 kg strikes Earth at a speed of 26 km/s. Find the kinetic energy of the comet in joules
Two metal rods of equal length-one aluminum, the other stainless steel-are connected in parallel with a temperature of 16.0%u2218C at one end and 126%u2218C at the other end, by what factor does the rate of heat flow change
TV broadcast antennas are the tallest artificial structures on Earth. In 1987, a 72.0-kg physicist placed himself, By how much was the antenna compressed
an elephant can runat a steady speed of 10m/sec and can stop in 2.5 sec what is the average acceleration of the elephant while stopping
The elementary particle called a muon is unstable and decays after 2.20 ?s, as observed in its rest frame, What lifetime do you observe for the muon
A wheel is spinning clockwise at a 10 revolutions per second at t = 0. Due to friction in the bearings supporting the axle, the wheel slows down, losing 0.500 revolutions per second in angular velocity each second, until it comes to rest.
A spider's web can undergo SHM when a fly lands on it and displaces the web. For simplicity, what is the frequency of oscillation when the fly lands
Yusef pushes a chair of mass m = 55.0kg across a carpeted floor with a force F? p of magnitude Fp = 148N directed at ? = 35.0degrees below the horizontal, What is the magnitude of the acceleration a of the chair
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change.
A bullet is fired through a board 10.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board, Find the acceleration of the bullet as it passes through the board
A playground merry-go-round has radius 2.90m and moment of inertia 2500kg?m2 about a vertical axle through its center, and it turns with negligible friction. How much work did the child do on the merry-go-round
A 3.8 kg ball is at rest on the floor in a 1.2 m ? 1.2 m ? 1.2 m room of air at STP. Air is 80% nitrogen (N2) and 20% oxygen (O2) by volume. What is the thermal energy of the air in the room
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