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The air above water is cooled as a result of the water absorbing heat from the air. The density of air is 1.29 kg/m3 and the specific heat of air is 1000 J/kg oC. How large a volume of air would be cooled by 1 degree Celsius if 1.57kg of water increases in temperature by 1.9 degree Celsius?
forces acting on the arm of a person lifting a dumbbell. the force f is the force pulling on the hand due to the weight
A series DC circuit contains a 4mH inductor and an 80 ohm resistor in series with a 12V battery. What is the time constant for the circuit? What are the initial and final currents?
Suppose a cannonball is fired into the air with an initial velocity of 35.0 m/s at an angle 32? above the horizontal. Ignore the effects of air friction. How far from the cannon will the second "half" land
The reserve capacity (RC) of a car battery is defined as the number of minutes the battery can provide 25.0A of current at a potential difference of 10.5V.
a 2.1mm -diameter glass bead is positively charged. the potential difference between a point 2.5mm from the bead and a
For a movie scene, a 75kg stuntman drops from a tree onto a 55kg sled that is moving on a frozen lake with a velocity of 15m/s toward the shore, What is the speed of the sled after the stuntman is on board
You have a compound microscope with a barrel of length 161 mm. Find the total angular magnification of the microscope for a person whose near point is 25.0 cm away
A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, What is the radius of the orbit
An emf is induced in a conducting loop of wire 1.11m long as its shape is changed from square to circular.Find the average magnitude of induced emf if the change in shape occurs in 4.03s and the local 0.135-T magnetic field is perpendicular to the ..
A charge of 27.0nC is placed in a uniform electric field that is directed vertically upward and that has a magnitude of 4.00×104 N/C. What work is done by the electric force
Two charged, parallel, flat conducting surfaces are spacedd=2.00cm apart, What is the initial speed of the electron if it stops just at the second surface
Using the liquid drop model, tabulate the nuclear binding energy and the various contributions to the binding energy for the nuclei 40Ca and 208Pb.
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