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A 676kW power station delivers power to a factory. The power is delivered through wires with a total (i.e. round-trip) resistance of 3.76Ohm. How much less power is wasted in the transmission wires if the electricity is delivered from the power station at 54200V rather than 13700V? (Hint: Consider the power plant as a battery delivering the voltage for the transmission line. How much current is flowing through the wire?)
A girl delivering newspapers covers her route by traveling 9.99 blocks west, 4.00 blocks north, and then 1.00 blocks east
Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, hip's speed at impact is about 2. If this can be reduced to 1.30 or less, hip will usually not fracture. One way to do this is by wearing elasti..
A person exerts a horizontal force of F = 169N in the test apparatus. (h = 0.32m.) Find the horizontal force M that his flexor muscle exerts on his fore arm.
A 70 kg man (rad=0.25m) standing on a 10-kg disc (rad=0.4m) with his arms extended (rad=0.9m) holding a 15-kg weight in each hand. What is the rotational inertia of man with weights.
Sally travels by car from one city to another. She drives for 30.0 min at 69.0 km/h, 37.0 min at 34 km/h, and 54min at 74.0 km/h and she spends 13.0 min eating lunch and buying gas.
If the maximum acceleration vehicle's brakes are capable of is -6.00 m/s2, what is the maximum reaction time of the motorist that will allow her or him to avoid hitting the deer.
submarine on the ocean surface receives a sonar echo indicating an underwater object. The echo comes back at an angle of 20 degree above the horizontal and the echo took 3.04s to get back to the submarine What is the object's depth?
Electric field lines from a charged flat plate in air to the parallel flat plate with the opposite charge (a dc capacitor). Within this space, small (compared to the size of the plates) rectangles of non -conducting and conducting materials.
A bucket of water with a mass of 2kg is attached to a rope that is wound around a cylinder. The cylinder has a mass of 3 kg and is mounted horizontally on frictionless hearings. The bucket is released from rest.
The relative angle of the knee changes from 5 degrees to 85 degrees during the knee flexion phase of a squat exercise. What is the total angular distance covered during 5 squats
A uniform electric field has a magnitude 2.40 kV/m and points in the +x direction, Find the expression for the electric potential V(x) if its value is chosen to be zero at x = 0
A skier is accelerating down a 30.0 degree hill at 1.8 m/s^2. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if elevation change is 325 m.
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