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the solar constant is the radiant flux density from the sun at the earth's surface and is about 0.135 W/cm^2 when the sun is directly overhead. assume an average wavelength of 650nm for the sun's radiation at the earth's surface.
a) find the amplitude of the E and B fields.
b) find the number of photons that arrive each second on one square meter of surface (assume noontime, equator, equinox)
What horizontal force is needed to hold bag in new position
A small remote-control car with a mass of 1.58 moves at a constant speed of = 12.0 in a vertical circle inside a hollow metal cylinder that has a radius of 5.
Certain stars at the end of their lives are thought to collapse combining their protons and electrons together to form a neutron star. Such a star could be thought of as a giant atomic nucleus.
A man exerts a 328 N force to move a box across a 3.55-m patch of ice. How much work does he do on the box.
A thin rod consists of two parts joined together. One-fourth of it is silver and three-fourths is gold. The temperature decreases by 21 C°.
What tension in Newtons should a 50cm length of string support in order to whirl an attached 2000g stone in a circular path at 5 m/s.
Inversely proportional to the square of the fields
Net horizontal force due to rolling friction
A shop sign weighing 245-N is supported by a uniform 155-N bean. Find out the tension in the guy wire, and the horizontal and vertical forces exerted by the hinge on the bean.
A certain car battery with a 12.0 V emf has an initial charge of 115 A·h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how various hours can it deliver energy at the rate of 110 W.
A gymnast of mass 60kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81 for the acceleration of gravity.
A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. Explain by how much upward force does each support exert on the beam?
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