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A floodlight with a mass of 36 kg is used to illuminate the parking lot in front of a library. The floodlight is supported at the end of a horizontal beam that is hinged to a vertical pole, as shown. A cable that makes an angle of 13? with the beam is attached to the pole to help support the floodlight. Assume the mass of the beam is negligible when compared with the mass of the floodlight.
Find the force FT provided by the cable. The acceleration of gravity is 9.81 m/s2 .
Runner A is at first 5.4 km west of a flagpole and is running with a constant velocity of 2.6 km/h due east. Runner B is initially 3.0 km east of the flagpole and is running with the constant velocity of 8.8 km/h due west. What would be the distance ..
A cart of mass M = 1.2 kg can roll without friction on a level track. A light string draped over a light, frictionless pulley connects the cart to a hanger with mass m = 0.5 kg. The cart is released from rest, allowing it to roll, pulled by falling h..
There are many estimates of the number of stars in the universe. One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe.
Calculate the threshold wavelength, in nm, of a metal if that metal emits an electron with a kinetic energy of 6.32 × 10-19 J when illuminated with light that has a frequency of 1.97 × 1015 Hz.
A ball is thrown from a rooftop with an initial downward velocity of magnitude vo = 5.8 m/s. The rooftop is a distance above the ground, h = 43 m.
Find out the relative rates at which clocks go at two different distances r1 and r2 from the center of the earth.
A high-frequency photon is scattered off of an electron and experiences a change of wavelength of 8.0×10-4 .At what angle should a detector be placed to detect scattered photon (relative to the direction of the incoming photon).
Explain how fast must the candy bar travel to have the same 106 joules in the form of kinetic energy?
A charged line of linear charge density ? has been bent into a circular arc of radius r that makes an angle ? with its center. (A). Find the magnitude of the electric field at the center of this arc. (Does your result make sense, what should it be..
Determine how long it would take an astronaut to fall from a height of 2 meters on the Moon. Compare this time to the time it would take the astronaut to fall the same 2 meters on the Earth. Also, compare the time to the time it would take on the ..
A model airplane with mass of 0.754 kg is tethered by a wire so that it flies in a circle 29.5m in radius. The airplane engine provides a net thrust of 0.796 N perpendicular to tethering wire.
A typical lightbulb in your house is rated 200 W, which means that the bulb dissipates 200 W when connected to a DC voltage of 110 V. (a) What is the current through the lightbulb? (b) If the voltage is reduced to 55 V, what is the dissipated powe..
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