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When you turn on the light switch for your dining room lamp, the light almost instantaneously lights up. How do the electrons in flow in a wire? How fast do the electrons move?
Assume that the vapor is an ideal gas (not a good approximation). a) How much work is done on the ethanol? b) What is the change in internal energy of the ethanol?
The current in an electro magnet connected to a 240 V line is 14.5A.At what rate must cooling water pass over the coils if the water temperature is to raise by no more than 7.50C ?
What can you conclude about the resulting displacements?
The point of the needle of a sewing machine moves in SHM along the x-axis with a frequency of 2.5 Hz. Find the acceleration component of the needle at t=0
A wagon is rolling forward on level ground. Friction is negligible.The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 91 kg. The mass of the rock is0.30 kg.
A person is standing in an elevator that is stationary. What is the weight of the person when the velocity is 3 m/s upward and the acceleration is 2 m/s^2 downward
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster?
two lasers are shining on a double slit with slit separation. laser 1 has a wavelength of d20 whereas laser 2 has a
In a skating stunt known as "cracking-the-whip," a number of skaters hold hands and form a straight line. estimate the magnitude of the centripetal force that acts on him
A 3.50 kg block on a smooth tabletop is attached by a string to ahanging block of mass 2.8 k. The blocks are released from rest and allowed to move freely. (a) Find the acceleration of the blocks, and (b) find the tension in the string.
Which of the following must be true if we are to infer (calculate) a star's luminosity directly from the inverse square law for light.
suppose that you wish to fabricate a uniform wire out of 0.800 g of copper. assume the wire has a resistance r 0.300
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