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A concrete highway is built of slabs 14m long (20 degrees Celsius). How wide should the expansion cracks between the slabs be (at 20 degrees Celsius) to prevent buckling if the range of temperature is -30 degrees Celsius to +48 degrees Celsius?
A 392\({\rm g}\) oscillator has a speed of 90.5\({\rm cm/s}\) when its displacement is 3.90\({\rm cm}\)and 74.5\({\rm cm/s}\), What is the oscillator's maximum speed
A rock is thrown vertically upward with a speed of 15.0m/s from the roof of a building that is 40.0m above the ground, What is the speed of the rock just before it strikes the ground
Two charged bodies exert the force of 0.185N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted.
Two coins, carrying identical charges, lie 1.5 m apart on a table and a coin experiences a force of 2.0 N, How large is the charge on each
A ball rolling along at speed v without slipping on a horizontal surface while it comes to a hill that rises at a constant angle above the horizontal.
Identical objects are located at the same distance from two spherical mirrors, A and B. Find the ratio fA/fB of the focal lengths of the mirrors
Drawing on Eratoshthenes' method, if two observers are due north and south of each other and are separated by 400 km, what is circumference of their spherical world if they see the similar star on their meridian at altitudes of 23degrees and 47deg..
Camera A has a lens with an aperture diameter of 8.30mm, What exposure time should be used with camera B in photographing the same object with the same film if this camera has a lens with an aperture diameter of 23.5mm
Light is incident on a thin prism for which n= 1.5. Find the angle of deviation for the emerging beam
If n=10, what is the largest value of the angular momentum l in this shell, How many electrons can be placed in this shell
A pocket ion chamber is built with an internal volume of 10 cc and a capacitance of 20 pF. calculate the minimum gamma-ray expose to which the pocket chamber will be sensitive
You see lightning strike a mountaintop, and 2.98 s later you hear the accompanying thunder. How far away is the mountaintop
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