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A spherical silver ball of radius 1 foot is set on a concrete pedestal as a lawn ornament. A hummingbird 3 inches long hovers 4.5 inches from the ball.
a) Where is the image of the hummingbird located (give an answer in inches)?
b) Does he appear to be in front of or behind the surface of the mirror?
c) How big is the reflection of the hummingbird?
d) Is his image upright or inverted?
For a damped oscillator with a mass of 320g, a spring constant 82N/m and a damping coefficient of 71g/s, what is the ratio of the amplitude of damped oscillations to the initial amplitude at the end of 28 cycles.
The stairs are 83 long and inclined at the angle of 31. If a player has a mass of 87, estimate his average power output on the way up. Overlook friction and air resistance.
how to compute the fraction of silver in the crown.
a man pushing a mop across a floor causes it to undergo two displacements. compute the direction of the second displacement
A diverging lens with a focal length of -48.0cm forms a virtual image 8.50mm tall, 16.5cm to the right of the lens. Determine the position of the object
A block of wood with volume V floats in water with 0.68V submerged. determine the density of the oil and wood
at what rate is the passenger train approaching the freight train.
A certain engine can exert 75,000 kg m/sec/sec of force. Assuming that all the force is used to accelerate the vehicle on which the engine is mounted, how fast would the vehicle accelerate assuming that it masses 5,000 kg? Neglect friction/air res..
A textbook of mass 1.90kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.150m, What is the tension in the part of the cord attached to the textbook
A blob of iron sinks form the surface of earth to the center. Assume the blob does not transfer any energy to its surroundings. Assume the density of earth is uniform.
A large block of copper initially at 20.0oC is placed in vat of hot water (80.0oC). For the first 1.0 J of heat that flows from the water into the block, find the entropy change of the block
a 1.0 point charge is 15m from a second point charge, what is the magnitude of the second charge?
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