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The chemical energy releasedby burning a gallon of gasoline is approximately1.3x10^5KJ.estimatethe total energy used by all of the cars in the US during thecourse of one year. what fraction does this represent of the totalenergy by the US in one year(currently about 5x 10^20 J)
With its double helix structure, DNA is coiled like a spring. A biophysicist grabs the end of a DNA strand with optical tweezers, What's the DNA spring constant
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.209 m and mass 5.65 kg, and two thin crossed rods of mass 9.95 kg each. what should the radius of the disk be
A toy train rolls around a horizontal 1.5-m-diameter track. The coefficient of rolling friction is 0.13. What is the magnitude of the trains angular acceleration
Two particles with masses 3m and 5m are moving toward each other along the x axis with the same initial speeds vi. Find the final speeds of the particles
What is the energy density in the electric field at the surface of a 2.00-cm-diameter sphere charged to a potential of 2000V
A landing airplane makes contact with the runway with a speed of 78.0 m/s and moves toward the south. After 18.5 seconds, the airplane comes to rest. What is the average acceleration of the airplane during the landing?
A 10 kg balloon is filled with helium. Its volume is 200 cubic meters. How much gold can it carry in air? How much gold can it carry in water?
The driver of a car going at 68miles/h suddenly sees a truckahead at 60 m moving slowly at 23 miles/h in the samedirection. By slamming on to the brakes, the driver of thecar achieves a maximum deceleration of 5m/s^2.
A mirror produces an image of the sun, and the image is located 0.9800 m from the mirror. What is the object height ho of the tree
A total of 2.99·106 electrons are placed on an initially uncharged wire of length 2.25 m. a) What is the magnitude of the electric field a perpendicular distance of 0.494 m away from the midpoint of the wire? b) What is the magnitude of the accele..
A u-tube with a cross-sectional area of 1.00 cm^2 is open to the atmosphere at both ends. WAter is poured into the tube until the water rises part way along the straight sides, What is the density of the oil
An electromagnetic flowmeter is used to meausre blood flow rates during surgery. Which of the two leads is at the higher potential
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