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Firefighters just finished eating dinner when a working fire came in. On the fireground the food energy expended to raise a ladder is balanced by the mechanical movement of the ladder and the firefighter pulling the halyard rope, minus the energy needed to overcome wind resistance, imperfect pulley, and ladder pawls, as well as the energy dissipated by perspiration and stimulated breathing. This is an example of of the _________
Consider a cell phone that emits electromagnetic radiation with a frequency of 1.0 GHz and with a power of 70 W. find the electric field amplitude at your ear as you use the phone
A steel bar is subjected to a vibration at one end, with an amplitude of 0.001 meters and a frequency of 250 Hz. Express the position of the end as a function of time
A 120 V space heater has two power settings. The equivalent resistance at the two settings are 19 ? and a 37 ?, After making a guess, determine the power at the low setting
A turtle ambles leisurely–as turtles tend to do–when it moves from a location with position vector r1,x = 1.97 m and r1,y = -2.35 m in a lettuce garden to another location, with position vector r2,x = 3.15 m and r2,y = -4.15 m, where the lettuce a..
the wavelength of a 63.7-mhz electromagnetic wave is approximatelya. 1.0 mb. 7.4 cmc. 27 md. 4.7
Suppose the barrel has a length of 0.511 m and an opening whose radius is 2.55 x 10-3 m. A bullet (mass = 2.6 x 10-3 kg) has a speed of 433 m/s after passing through this barrel. Ignore friction and determine the average pressure of the expanding ..
A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 4.0 mW. How many photons are emitted per second by this laser
A robot probe drops a camera off the rim of a 388 meter high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. Determine the velocity with which it hits the ground
a plate capacitor has a spacing between its plates of 5.0 mm and a potential difference of 3.0 103 v across its plates.
Consider a hypothetical universe in which the electron hasspin 3/2 rather than spin 1/2. Draw n enegy level diagram for the n=3 states of hydrogen,neglecting fine structure and hyperfine strucure. Label the states by the appropriate quantum nubers..
A hand-driven grinding wheel is a uniform 62-kg disk with a 41-cm radius. It has a handle of negligible mass 64 cm from the rotation axis. Find the maximum angular velocity of the wheel
Some cell walls in the human body have a layer of negative charge on the inside surface and a layer of positive charge of equal magnitude on the outside surface, Estimate the total electric-field energy stored in the wall of a cell of this size
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