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A closed box is filled with dry ice at a temperature of -78.5 degrees C, while the outside temperature is 21.0 degrees C. The box is cubical, measuring 0.350 m on a side, and the thickness of the walls is 3..00 x 10^-2 m. In one day, 3.10 x10^6 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.
A commuter train blows its horn as it passes a passenger platformat a constant speed of 30.0 m/s. The trainhorn sounds at a frequency of 330 Hz whenthe train is at rest. What wavelength does the observer find in each case?
By curving different isotopes through paths with different radii, a mass spectrometer can be used to purify a sample of mixed uranium-235 and uranium-238 isotopes. Assume that B = 5.00*10^-3 T, V = 55.0 V, and that each uranium isotope has a 5+ io..
in the simulation above the length and orientation of the blue and yellow vectors can be changed by dragging the tips
A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, Calculate the acceleration of the elevator
One and one-half moles of an ideal monatomic gas expand adiabatically, performing 7910 J of work in the process. What is the change in temperature of the gas during this expansion
A boy is running at a speed of (6.4 m/s) and grabs a rope hanging vertically from a tall tree in order to swing out over a pond. Determine how high can he swing upward
What is the smallest thickness of a soap film that would appear black if illuminated with 470 nm light? Assume there is air on both sides of the soap film
question an 85.8 g mass is attached to a horizontal spring with a spring constant of 5.52 nm and released from rest
A system has a heat source supplying heat at a rate of 149 W and is doing work at a rate of 104.3 W. At what rate is the internal energy of the system changing
A block is in equilibrium on a frictionless incline plane due to a tension force from a string that is wrapped around a pulley, find the masses m1 and m2 of the blocks
A baseball player with mass m = 75 kilogram, sliding into second base, is retarded by a frictional force of magnitude 500 Newton. Find coefficient of kinetic friction between player and ground
A non conducting solid sphere of radius 2.30 cm carries a uniformly distributed positive charge of 8.30 x 10-9 C. Calculate the magnitude of the electric field at a point 1.30 cm away from the center of the sphere
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