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A pressure drop of 100 kPa is desired in 80 m of smooth pipe transporting 20-C water at a flow rate of 0.0016 m3=s. What diameter pipe should be used? Because the Moody diagram requires a trial-and-error solution, one of the alternate equations is recommended.
In a downtown office building you notice each of the four sections of a rotating door has a mass of 85 kg. What is the width of each section of the door if a force of 64 N applied to the outer edgE
A copper cup of mass 0.300 kg contains 1.00 kg of water at 315 K. It is cooled so that the temperature decreases by 2.50 K each minute. What is the rate of removal of thermal energy in watts
During a thunderstorm the electric field at a certain point in the earth's atmosphere is 1.06 x 105 N/C, directed upward. Obtain the acceleration of a small piece of ice of mass 1.01 x 10-4 gram
A 72 skydiver can be modeled as a rectangular "box" with dimensions 25 cm*40cm* 1.8m . What is his terminal speed if he falls feet first
A bike rider expends a certain amount of energy to travel 12 m=s while in the upright position. How fast will the rider travel with the same amount of energy expenditure if the bent over position is elected? Assume the rider's projected area is re..
An object is being pushed up an inclined plane with a constant force F = 100. N. The plane makes an angle of 30.0° with respect to the horizontal, What is the mass of the object
A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2 rad/s. After the disk rotates through 1 radians, the angular speed is 17rad/s. What is the magnitude of the angular acceleration?
A parallel-plate capacitor has circular plates and no dielectric between the plates. Each plate has a radius equal to 2.3 cm and the plates are separated by 1.1 mm. Charge is flowing onto the upper plate (and off of the lower plate) at a rate of 5..
The space between two concentric conducting spherical shells of radii b = 1.70 cm and a = 1.20 cm is filled witha substance of dielectric constant κ = 20.8. A potential difference V = 15.0 V is applied across the inner andouter shells.
A mass-spring system has k = 55.2N/m and m = 0.405kg. Find the frequency of its simple harmonic motion
First discuss how energy can be converted from one form to another, giving specific examples. Define what we mean
One ball is thrown upwards from the edge of the roof of 35 Three seconds a m tall building. What was the initial velocity of the first ball
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