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A 0.50 kilogram object moves in a horizontal circular track with a radius of 2.5 meter. An external force of 3.0 Newton, always tangent to the track, causes the object to speed up as it goes around. Find the work done by the external force as the mass makes one revolution?
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
A wind turbine is originally spinning at a constant angular speed. As the wind's strength gradually increases, the turbine experiences a constant angular acceleration of 0.120rad/s2. After making 2871revolutions, its angular speed is 138rad/s.
a harvest mouse can detect sounds as quiet as -10 dB. suppose you are sitting in a field on a very quiet day while a harvest mouse sits nearby at the entrence to its nest, How far is the harvest mouse from the leaf
Hydroelectric power plants convert gravitational potential energy into more useful forms with flowing water downhill during a turbine system to generate electric energy. The Hoover Dam on the Colorado River is 211 m high and generates 4.00 x109 kW · ..
A 4 kg block rest against one end of a horizontal spring which is compressed by 20 cm. Calculate the constant of kinetic friction Mk between the block and the table
Water enters a pipe with a cross sectional area of 3.0 cm2 with a velocity of 3.0 m/s. What is the cross sectional area of the constricted portion of the pipe
q1. a 20 kg block is at rest on a horizontal floor. if you push horizontally on the 20 kg block with a force of 50 n it
A mosquito flaps its wings 650 vibrations per second, which produces the annoying 650 Hz buzz. The speed of sound is 340 m/s. How far does the sound travel among wing beats? In other words, find the wavelength of the mosquito's sound.
You are an astronaut (m = 90 kg) and travel to a planet that is the same mass and size as Earth, What is your apparent weight at the equator of this planet
Two blocks are connected by a rope that passes over a set ofpulleys. One block has a weight of 908N. What is the acceleration of the lighter block
A 1 200-N uniform boom at f 5 65° to the horizon- tal is supported by a cable at an angle u 5 25.0° to the horizontal, calculate the tension in the support cable
A truck of mass 9312 kg moving at a speed of 68.7 mph has lost its brakes. Fortunately, the driver finds a runaway lane, a gravel-covered incline that uses friction to stop a truck in such a situation; see the figure.
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