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Suppose the faintest star you can see with a 4-inch telescope has a magnitude of+8.0. What is the magnitude of the faintest star you could see (under the same conditions) with a 20-inch telescope?
Two 1.5 V batteries connected in a series to a 5 ohm resistor produce a 0.7 A current Find the internal resistance of batteries
A 0.300 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.900 m/s when it makes a head-on collision with a stationary 0.150 kg glider. Find the magnitude of the final velocity of first glider
a 5.5 kg bucket of water is raised from a well by a rope. the acceleration of gravity is 9.81 ms2 . if the upward
An isotope of krypton has a half-life of 3 minutes. A sample of this isotope produces 1000 counts per minute in a Geiger counter. Determine the number of counts per minute produced after 15 minutes.
You are designing a diving bell to withstand the pressure of seawater at a depth of 260m. What is the gauge pressure at this depth
A 5.000 kg mass starts from rest and slides down on an inclined plane that is 5 degrees above the horizontal. If the body starts from rest and takes 1.25 s to travel a distance along the inclined plane, what is the final velocity of the body
An ac generator with a frequency of 1.44kHz and an rms voltage of 25.2V is connected in series with a 1.80kohm resistor and a 300mH inductor. What is the power factor for this circuit
a wire of unknown material has a cross sectional area 5 mm^2 and length 12cm. The wire carries current density j = 3uC/s/m^2, what is the resistivity of the unknown material
Is there a didactical disadvantage in projecting much if not all of the described clock-related terminology into one and the same word: "time" ?
An astronaut is traveling to the Moon at a speed of 0.57c. When his spacecraft is1.9*10 8 m from the Moon, there is an explosion on the Moon. How long does it take for light from the explosion to reach the astronaut as gauged on the astronaut's clo..
An object of mass 3.00 kg, moving with an initial velocity of 5.00i m/s, collides with and sticks to an object of mass 2.00 kg with an initial velocity of ?3.00j m/s
What is the least thickness of a soap bubble film (n = 1.38) on which light of wave length 610nm shines, assuming one observes constructive interference of the reflected light.
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