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A hiker, who weighs 810 Newton, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3850 Newton, and rests on two concrete supports, one on each end. He stops 1/5 of the way along the bridge. Find the magnitude of the force that a concrete support exerts on the bridge
(a) at the near end and
(b) at the far end?
One of the loudest sounds in recent history was that made by the explosion of Krakatoa on August 26-27, what was the decibel level on Rodriguez Island
question a 0.410-kg ball is dropped from rest at a point 4.30 m above the floor. the ball rebounds straight upward to a
There is a 6Ωelectric heater that consumes 15 W of power. The conducting bar moves to the right at a constant speed, the field strength is 2.4T, and the length of the bar among the rails is 1.2m.
a 200 g object tied to a string 80 cm long travels in a vertical circle of radius 80 cm. at the top of the circle the
The "hang time" of a punt is measured to be 4.30. If the ball was kicked at an angle of 68.0 above the horizontal and was caught at the same level from which it was kicked, what was its initial speed?
The green block(B) has a mass of 10.00kg and is moving to the left at a speed of 3.70m/s. What should the velocity of the red block be in order to have the two blocks move to the right with a speed of 1.30 after the collision
A point charge of +2Q is placed at the center of a square. When a second point charge of -Q is placed at one of the square's corners, it is observed that an electrostatic force of 4 N acts on the positive charge at the square's center.
A basketball star covers 2.6 m horizontally in a jump to dunk the ball. His motion through space can be modelled precisely as that of a particle at his center of mass. His center of mass is at elevation 1.02m when he leaves the floor. It reaches a..
a 336-g mass vibrates according to the equation x0.4 cos7.9 t where x is in meters and t is in seconds. what is the
The speed of light in a material is 0.52×c. What is the critical angle (in degrees) of a light ray at the interface between the material and a vacuum
The Earth has a radius of 6.38 × 10^6 m and is 1.49 × 10^11 meters from the Sun. If the intensity of solar electromagnetic radiation at the top of the Earth's atmosphere is 1330 W/m^2, what is the total radiated power output of the Sun?
Two particles, each of mass M, are hung between three identical springs. Each spring is massless and has spring constant K. Neglect gravity. The masses are connected as shown to a dashpot of negligible mass.
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