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Object A has an emissivity of 0.95; and its temperature is 25 degrees C At what temperature (in degrees C) does object B, whose emissivity is 0.50, emit radiation at the same rate as object A if both objects have the same surface area?
an 11000-watt radio station transmits at 880 khz. calculate the energy of a single photon at the transmitted
A gratign spectrometer while in a vaccum on Earth sends 500nm light off at angle 20.0 degrees in first order spectrum, find the index of refration of the mongoian atmosphere
A 9.0 V battery is connected across two large parallel plates that are separated by 4.5 mm of air, creating a potential difference of 9.0 V between the plates. What is the electric field in the region between the plates
A particular organ pipe can resonate at 231 Hz, 385 Hz, and 539 Hz, but not at any other frequencies in between. Is it an open or a closed pipe? What is the fundamental frequency of this pipe.
A lens of focal length +1.25 cm is used as a simple magnifier by holding outside the eye. what is the angular magnification
In a section of horizontal pipe with a diameter of 3.0 cm, the pressure is 100 kPa and water is flowing with a speed of 1.5 m/s. What is the pressure in the narrower region
An electron is accelerated by a uniform electric field (1000 V/m) pointing vertically upward. Use energy methods to get the magnitude and direction of its velocity
In an action-adventure film, the hero is supposed to throw a grenade from his car, which is going 94.0 km/h, to his enemy's car, which is going 112 km/h. Find the magnitude of the velocity relative to the earth
An ion in a mass spectrometer is accelerated during a voltage of 45 V. The ion has a mass of 6.634 X 10 ^-26 kg. It passes during a magnetic field strength of 0.080 T and its path has a radius of 53.99 mm. What is the charge on the ion?
1 you chose a an arbitary point to begin measuring the postion of the falling object. how fast was it going at the
Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.59 m/s at 41.7° above the h..
Three electrons are placed at the vertices of an equilateral triangle with a side length of 5.1 nm. A proton is placed at the center of the triangle. What is the potential energy of this arrangement of charges
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