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A 20.0 kg floodlight in a park is supported at the end of a horizontal beam of mass 20.0 kg and length L that is hinged to a pole (beam and pole are perpendicular). A cable at an angle of 30.0 degrees with the beam helps to support the light.
a) Find the tension in the cable.
b) Find the horizontal and vertical forces exerted by the beam on the pole.
Use the Bohr theory formulas to determine the potential energy of an electron in the ground state of hydrogen
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A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 2 L of water
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Earth is about 150 trillion meters from the Sun, while Mars is about 230 trillion meters from the Sun. What is the gravitational force between Mars and Earth
Two positive point charges, each 17? C, lie along the x-axis at x = –0.12m and x = +0.12m.
Scientists have recently shown that a sample of cocaine can be traced to its country of origin by measuring the ration of carbon-13 to nitrogen-15 (both naturally occuring, stable nuclides) in the cocaine sample.
A thin spherical shell rolls down an incline without slipping. If the linear acceleration of the center of mass of the shell is0.27g, what is the angle the incline makes by the horizontal?
the human body normally produces about 2 x 106 red blood cells per second.a. use scientific notation to express how
How much is the spring compressed?
The illumination lights in an operating room use a concave mirror to focus an image of a bright lamp onto the surgical site. find the position of its lamp when the patient is positioned 1.0 m from the mirror
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