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A 4-meter plank weighing 7 kg is lying on a dock with 3.39 meters of its length on the dock, and the rest of its length extending off the dock. If a child weighing 31.7 kg walks out onto the part of the plank extending off the dock, what is the maximum distance in meters that the child can walk on the plank from the edge of the dock before he falls into the water?
A small statue has a height of 3.4 cm and is placed in front of a concave mirror. Find the focal length of the mirror
What is Newtons Version of Keplers Third Law
an insulated container is filled with a mix of 400 g of water at 20 C and 60 g of ice at 0 C. assuming negligible heat is exchanged with the container, what is the temperature of the mixture when it reaches thermal equilibrium.
a bird flies 2.8rm km due west and then 2.7rm km due north. another bird flies 2.7rm km due west and 2.8rm km due
An energy of 0.1 J is stored in the metal ball on top of a Van de Graaff generator. A spark carrying 1 micro coulomb (10^-6 C) discharges the ball. What was the ball potential relative to ground?
A pulsar is a collapsed, rotating star that sends out a narrow beam of radiation, like the light from a lighthouse. at what rate does an observer on the Endeavor see pulses emitted
A cannonball is fired from a gun and lands 740 meters away at atime 20 seconds. What is the x-component and y-component of the initialvelocity? The maximum height of the cannonball?
The Sun emits electromagnetic waves (including light) equally in all directions. At what rate does the Sun emit electromagnetic waves
Typical field strengths are a few femoteslas (1fT=10^-15T). An adult brain is about 140mm wide, A reasonable magnetic field is 4.35fT at the sensor. According to this model, what is the current in the brain?
Two cylindrical bars, each with diameter of 2.30 cm, are welded together end to end. compute the resistance between the ends of the welded bar
anbsp32.5-kg crate rests on a horizontal floor and anbsp60.4-kg person is standing on the crate. determine the
Let a coil wand pendulum start swinging with an angle of 30 degrees with the vertical. What is the energy lost by the pendulum
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