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A roller coaster (482 kg) moves from A (3.63 m above the ground) to B (28.6 m above the ground). Two non-conservative forces are present: friction does -1.67 x 104 J of work on the car, and a chain mechanism does +5.83 x 104 J of work to help the car up a long climb. What is the change in the car's kinetic energy KEf - KEo from A to B?
You operate a small grain elevator near Champaign, Illinois. What is the power provided by the electric motor powering the bucket elevator when the bucket elevator ascends with a full load at a speed of 2.2 m/s
A 3.07 kg particle has a velocity of (3.10 i hat - 4.04 j hat) m/s. Find the magnitude and direction of its momentum
When in deep space, the block accelerates at 4.2 m/s^2 even as a 120 N force is applied to it. The coefficient of static friction for a particular plane and this block is 0.31. What angle can this plane make with horizontal before the object starts t..
A 65 kg high jumper starts his push-off phase with his center of mass .45 m above groung and velocity of 0 m/s. How much work did the mat do on the high jumper
A river has a steady speed of 0.42m/s. A student swims upstream a distance of 1 km and swims back to the starting point. If the student can swim at a speed of 1.25 m/s in still water, how long does the trip take.
What will the traveler weigh on another planet. Two wires are identical, except that one is aluminum and one is iron. The aluminum wire has a resistance of 0.18 . What is the resistance of iron wire.
Two small metallic spheres, each of mass 0.20 g, are suspended as pendulums by light strings from a common point, what is the magnitude of the charge on each sphere
A surveyor is using a magnetic compass 5.8 m below a power line in which there is a steady current of 88 A. What is the magnetic field at the site of the compass due to the power line
A 49.2-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.637 and 0.439, respectively. What horizontal pushing force is required
The primary of a step-down transformer has 290 turns and is connected to a 120 V rms line. The secondary is to supply 17 A at 7 V. Find the number of turns in the secondary, assuming 100% efficiency
A cylindrical container filled with water having a cross section 0.04 m^2 is placed on a scale, What is the rise in water surface after the ball is put in the water compared to before
A patient is going to be prescribed bifocals which will be 3.20 cm from the eye, Without the bifocals, what is the patient's near point
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