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A brick of mass 1.21 kg is attached to a thin (massless) cable and whirled around in a circle in a vertical plane. The circle has a radius of 1.38 meters. The cable will break if the tension exceeds 49.0 Newtons. What is the maximum speed the brick can have at the bottom of the circle before the cable will break?
Throughout a nuclear reactor accident, 570 m3 of water at 20o C is pumped into the reactor core which is producing heat at the rate of 250 MW. If the water is allowed to boil at normal atmospheric pressure how long would it take to boil away all this..
A train is travelling up a 4.5 degree incline at a speed of 3.25 m/s when the last car breaks free and begins to coast without friction. a) How long does it take for the last car to come to rest momentarily? b) How far did the last car travel befo..
Four charges are placed at the vertices of a square, centered at the origin. If each side of the square has a length of 0.224 m, what is the strength and direction of net electric field at the origin? Express your answer in terms of the charge ma..
Express the velocity of the puck in the unit vector(i,j) notation and in the magnitude and angle notation. Vx = 0.026m/s Vy = 0.053m/s And then find the momentum of the puck
Assume that the sun runs out of nuclear fuel & suddently collapses to form a white dwarf star, with a diameter equal to that of the Earth. Estimate the new rotation period of the Sun.
Evaluate the magnitude of N at the lowest point? If the wheel's speed is doubled, what is the magnitude FN at the highest and lowest point?
Water flows out of a large open reservoir through a small pipe that opens to the atmosphere 30 m below the level of the water in the reservoir.
A 120cm3 box contains helium at a pressure of 2.20atm and a temperature of 80.0â??C. What is the initial thermal energy of each gas?
A spring with spring constant 19 hangs from the ceiling. A ball is attached to the spring and allowed to come to rest. It is then pulled down 2.5 and released. The ball makes 33 oscillations in 15 seconds. What is its utmost speed.
What is the electric potential energy of three equal positive charges of 1.33 µC while they are arranged to form a triangle 2.10 x 10-3 m on a side.
How much energy is lost through your hands in one minute after touching on a cold surface at 10 C compared to being exposed to cold air at 10 C
A 56 kg student runs at 5.0 m/s, grabs a hanging rope, and swings out over a lake, What is the maximum tension in the rope?
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