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A hiker, who weighs 900 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3060 N, and rests on two concrete supports, one at each end. He stops one-fifth of the way along the bridge. What is the magnitude of the force that a concrete support exerts on the bridge at each end?
A cannon is fired horizontally with a velocity of 35.0 m/s from a height of 10 meters. With what total velocity does it strike the ground
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. What is the size of the final image and what is its position
A uniform electric field of magnitude 380 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 2.60 cm. (a) What is the work done by the field on the electron? J (b) What is the change in..
Two sound sources radiating in phase at a frequency of 485 Hz interfere such that maxima are heard at angles of 0 and 22° from a line perpendicular to that joining the two sources. Find out the separation between the two sources.
Calculate the work done by the electric field force on an electron when the electron moves from point O, where the potential is -30.0 V, to point F,
A person wants to push an 80-kg box across the floor. The coefficient of friction between the box and the floor is 0.5. What is the normal force experienced by the box as it sits on the floor
You place an object with an electrical charge of +0.256 C at a point in space, What is the magnitude and direction of the electric field at that point in space
If a car traveling at 55 km/h will skid 24 m while its brakes lock, how far will it skid if it is traveling at 130 km/h when its brakes lock.
A lithium-5 nucleus is moving at 1.6 Mm/s when it decays into a proton and an alpha particle. What are the magnitude and direction of the proton's velocity
How rapidly atom are assembled in this protein synthesis
A spaceship travels past an observer at a speed of 0.6c. What time would the observer record for the same event
A uniform cylindrical turntable of radius 1.80 m and mass 25.2 kg rotates counterclockwise in a horizontal plane with an initial angular speed of 4pi rad/s. Find the final angular speed of the clay and turntable
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