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A heat engine utilizes a heat source at 580 degrees Celsius and has an ideal (Carnot) efficiency of 28%, to increase the ideal efficiency to 34%, what must be the temperature of the heat source?
Jack and Jim are resting on an offshore raft after a swim. They estimate that the horizontal distance between a trough, Calculate how fast the waves are moving
The plates of a parallel-plate capacitor have a separation of 4.04mm , and each has an area of 15.4cm2 . Each plate carries a charge of magnitude 6.65×10?8C, What is the potential difference between the plates
Two adjacent natural frequencies of an organ pipe are determined to be 525 Hz and 595 Hz. (Assume the speed of sound is 343 m/s.) Calculate the fundamental frequency of this pipe.
An unloaded Hummer has a standard ground clearance of 40cm, and an unloaded mass of 2000kg. What is the total mass of the hummer
A 0.07-kg lead bullet traveling 296 m/s strikes an armor plate and comes to a stop. If all of the bullet's energy is converted to heat that it alone absorbs
Describe one model for the origin of the Milky Way Galaxy. How does this model explain the differences between Population I and II stars.
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of itsengines is 3.13x105 N. In being launhced from rest itmoves through a distance of 53.3 m and has a kinetic energy of 7...
A copper rod has a length of 1.7 m and a cross-sectional area of4.1 x10-4 m2. One end of the rod is incontact with boiling water and the other with a mixture of ice andwater. What is the mass of ice per second that melts? Assume that no heat is lo..
A diver tucks her body in midflight, decreasing her moment of inertia by a factor of two. By what factor does her angular speed change
The current in a 80.0-mH inductor changes with time as I = 3.00t2 ? 7.00t, where I is in amperes and t is in seconds. Find the magnitude of the induced emf at t = 1.00 s.
Two point charges of +5.0microcolumb +8microcolumb are placed inside a cube of edge length 0.100m. What is the electric flux due to these charges
A loudspeaker of mass 21.0 {rm kg} is suspended the distance of h = 2.40 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.90 {rm m}.
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