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A certain kind of film requires an exposure time of 0.010 s with anf / 12 lens setting. Another type of film requires quadruple the light energy to produce the same level of exposure. What f-number does the second type of film require with the0.010-s exposure time?
Physicists model a magnetic field by assigning to every point in space a vector that represents the strength and direction of the field at that point, What is the combined magnetic field at this point
A perfectly flat thin piece of glass (n=1.5) that is 6cm long and 2cm wide is placed over a perfectly flat piece of black plastic (n=1.2) that is the same size. One end of the glass is slightly elevated while the other end is in contact with the plas..
A 130 kg crate is pushed at constant speed up the frictionless 28° ramp. What force is exerted by the ramp on the crate
What is the current in the element of an electric clothes dryer with a resistance of 8.2? when it is connected to 240 V
The Hamiltonian of a system of two (spin-1/2) electrons H= ?1?z1+?2?z2 where ?z is the Pauli Matrix, ? is an energy parameter and our subscripts represent the two electrons 1 and 2. What is the basis where this Hamiltonian is diagonal?
A cube of ice is taken from the freezer at -9.2°C and placed in a 98 g aluminum calorimeter filled with 299 g of water at room temperature of 20°C. What was the mass of the ice cube
A tank holds a 1.44-m thick layer of oil that floats on a 0.96-m thick layer of brine. Both liquids are clear and do not intermix. what is the angle that the ray in the air makes with the vertical
If an astronomical telescope has the magnification of -32.0 ? and its objective lens has a focal length of 77 cm, what is the focal length of its eyepiece
At time t = 0 s, apple 1 is dropped from a bridge onto a roadway beneath the bridge; somewhat later, apple 2 is thrown down from the same height.
a 50 turn square coil has an area 15.0 cm2 and is rotated with an angular speed of 80.0 rads in a uniform 0.40 t
A Carnot engine is operated between two heat reservoirs at temperatures of 300K and 400K.
A firefighter mounts the nozzle of his fire hose a distance 30.5 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. By what factor was the nozzle diameter changed
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