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Illustrates how the forces can vary in problemsof this type. A hiker, who weighs 857 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform,weighs 4420 N, and rests on two concrete supports, one on each end. He stops 1/5 of the way along the bridge. What is the magnitude ofthe force that a concrete support exerts on the bridge(a) at the near end and (b) atthe far end?
Consider a large parallel plate capacitor with circular plates of radius R. suppose that the electric field between the plates is increasing.
A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
A 0.100g plastic bead is charged by the addition of 1 x10^10 excess electrons (i.e. so the bead becomes negatively charged). What electric field (magnitude and direction) will cause the bead to hang suspended in the air?
A 800kg , light-weight helicopter ascends from the ground with an acceleration of 3.50m/s2. What is the work done by the gravitational force
Starting from one oasis, a camel walks 25 km in a direction 30 degrees south of west and then walks 30 km toward the north to a second oasis
The pulmonary artery, which connects the heart to the lungs, has an inner radius of 2.2 mm and is 8.6 cm long. find the average speed of blood in the pulmonary artery
the record of 203.1 km/h for speed skiing set by franz weber at velocity peak in colorado was achieved in a mountain slope inclined downward at 51 degrees. what is the rate at which gravity does work on the skier
A very thin wire, which follows a semicircular curve C of radius R, lies in the upper half of the x-y plane with its center at the origin. There is a constant current I flowing counter clockwise, starting upward from the end of the wire on the pos..
A nurse measures the temperature of a patient to be 39.3°C. What is this temperature on the Fahrenheit scale
a 3.77-kg ball of clay is thrown downward from a height of 3.47 m with a speed of 4.81 ms onto a spring with k 1690
Assume a constant upward slope of 32; calculate the horizontal and vertical components of the acceleration of a truck that slowed from 140 to rest in 7.3.
A horizontal force of 80 N acts on a mass of 6 kg resting on a horizontal surface. The mass is initially at rest and covers a distance of 5 m in 0.92 s under the action of the force. find the coefficient of friction between the mass and the surface
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