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A rock is thrown upward from the hand at an initial speed of 4.5 m/s. How much later should a second rock be dropped from the same initial height of 0.900 m so that the two rocks hit the ground at the same time? (in s)
A bird sits on a telephone wire midway between two poles 20 meters apart. The wire, assumed weightless, sags by 50 cm. If the tension in the wire is 90 Newtons, what is the mass of the bird?
A speeder is pulling directly away and increasing his distance from a police car that is moving at 21 m/s with respect to the ground. compute the speeder's speed with respect to the ground
if the coefficient of kinetic friction between the 50-kg crate and the ground is .3 determine the distance the crate
Two small, positively charged spheres have a combined charge of 5.35×10-5 C. If each sphere is repelled from the other by an electrostatic force of 1.00 N
When light with a wavelength of 206 nm is incident on a certain metal surface, electrons are ejected with a maximum kinetic energy of 2.57 x 10-19 J. find the wavelength (in nm) of light that should be used to double the maximum kinetic energy of ..
a bottle has a mass of 35 g when empty and98.45 g when filled with water. what is the specific gravity of the other fluid
the water level in a vertical glass tube1.50m long can be adjusted to any position in the tube. a tuning fork vibrating
A pail of water is rotated in a vertical circle of radius 1.00 m (the approximate length of a person arm). What must be the minimum speed of the pail
Suppose one gallon of gasoline produces 1.1 108 J of energy, and this energy is sufficient to operate a car for 43 miles. how many miles would the car go on a single tablet
A 6kg block sits on a surface with µs=0.5 and µk=0.3. You exert a force (F) at an angle of ?=30°on this block. what is the net work done on the block over this time
Consider the mass on aspring system in Figure P11.20. Three identical springs, What is the frequency of this simple harmonic oscillator
A spring with spring constant 12.5 hangs from the ceiling. A 400 ball is attached to spring and allowed to come to rest. It is after that pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57...
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