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The US currently uses about 27 quad of energy for transportation per year, nearly all of which comes from petroleum. The Alaskan oil fields are estimated to have as much as 64 quad of oil. How many years could the Alaskan oil reserves supply US transportation needs at the current rate of use? Some analysts estimate that cars and trucks could be made 60% more efficient than they are currently. How long will the Alaskan oil reserves last if the annual transportation energy demand is reduced by 60%?
charge is distributed with constant volume density d throughout the rectangular box with length a width b and height
A column of soldiers, marching at 133paces per minute, keep in step with the beat of a drummer at thehead of the column. What is the approximate length of the column
The aluminum cable of a high-voltage transmission line carries a current of 600 A. What is the power lost to Joule heating in this cable
A sphere of radius 4.12 cm and uniform surface charge density+11.6μC/m2 exerts an electrostatic force ofmagnitude 4.83×10−2N on a point charge+1.25μC. Find the separation between the point chargeand the center of the sphere.
A merry go round has a moment of inertia of 1000 kgm^2. When it is rotating at 2.62 rad/sec, the motor shut off. How large was the friction torque
A playground carousel is rotating counterclockwise about its center on frictionless bearings. Find the final angular speed of the carousel
A steel ball is dropped onto a hard floor from a height of 1.25 m and rebounds to a height of 1.16 m. (Assume that the positive direction is upward.) Calculate its velocity just before it strikes the floor
A 2.00 kg mass is located at (4.00 m, 0.00 m, 0.00 m) and a 4.00 kg mass is located at (0.00 m, 3.00 m, 0.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is ?
A block of mass 10 kg is resting on a frictionless ramp. The ramp is free to slide on a horizontal, frictionless table and has a mass of 40 kg. What is the acceleration of the ramp
A person drops an object from a bridge spanning a rushing river, falling a distance h before hitting the water. what would be the object's speed at the moment of impact
Planet A and Planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than Planet B. What is the ratio of their speeds
A well-mixed sewage lagoon (a shallow pond) is receiving 430 m3- d-1 of sewage out of a sewer pipe. The lagoon has a surface area of 10 ha (hectares) and a depth of 1.0 m. The pollutant concentration in the raw sewage discharging into the lagoon i..
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