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A) Steel train rails are laid in 12.2m -long segments placed end to end. The rails are laid on a winter day when their temperature is -2.00 oC . How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 33.0 oC? B) If the rails are mistakenly laid in contact with each other, what is the stress in them on a summer day when their temperature is 33.0 oC?
Illustrate what constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally?
A man uses a tire iron to loosen his lug nuts. The tire iron is 25cm long. The man applies a force of 30N at an angle of 29° to the iron. What is the torque that is applied to the lug nut
A charge of -3.9 micro-coulombs is launched from the positive plate of a large capacitor to the negative plate.
Two packages at UPS start sliding down a ramp 40 degrees from the horizontal, Package A is sliding down in front of Package B. Package A has a mass of 3.50 and a coefficient of kinetic friction of 0.220. Package B has a mass of 8.00 and a coefficient..
A current of 0.307 A through your chest can send your heart into fibrillation, ruining the normal rhythm of heartbeat and disrupting the flow of blood (and thus oxygen) to your brain. If that current persists for 2.90 min, how many conduction elec..
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
The beam from a diode laser is used to investigate the refraction of a piece of plastic. Determine the wavelength of the light in the plastic in nanometers (nm).
How many revolutions does the ball make during its fall. Now assume that the ramp is frictionless, so that the ball slides instead of rolling. Through what horizontal distance d does the ball move before landing in this case.
A spotlight sends red light (wavelength = 694.3 nm) to the moon. At the surface of the moon, which is 3.77 multiply.gif 108 m away, Determine the diameter (not the radius) of the central bright spot on the moon
A ball is tossed from an upper story window of a building. Compute the height from which the ball is thrown.
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 12-g nail
Water at 25 degrees celius is pumped from 100kPa to 5MPa in a pump with an efficiency of 75%, Calulate the temperature rise in the real pump
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