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Question: The boundary layer which forms at the entrance to a circular pipe may be considered to behave like the boundary layer on a flat plate. Estimate the length needed to reach fully developed flow (i.e., for the edge of the boundary layer to reach the center line) for water at 68OF entering a pipe of 2-in. ID at a uniform velocity of
(a) 50 ft/s,
(b) 5 ft/s,
(c) 0.05 ft/s.
Block 1 of mass m1 slides from rest along a frictionless ramp from height h = 3 m and then collides with stationary block 2, which has mass m2 = 5m1. What is the value of distance d if the collision is Elastic inelastic.
A point charge with Q1=2e-7 Coulombs is placed at the point y=-0.05 meters on the negative y-axis and another charge Q2 = 2e-7 Coulombs is placed at the point y=0.05 meters on the positive y-axis. Find the electric field, magnitude and direction, at ..
A rod 50 cm long and 1.0 cm in radius carries a 2.0 microC charge distributed uniformly over its length. Find the approximate magnitude of the electric field
The image of a crayon appears to be 21.5 cm behind the surface of a convex mirror and is 2.39 cm tall. The mirror's focal length is 40.9 cm. a) How far in front of the mirror is the crayon positioned? Answer in units of cm.
What is the point of measuring 125 cycles (25 × 5) in Part A? Would it have been as accurate to measure one cycle 125 separate times? Why?
An outside loudspeaker (considered a small source) emits soundwaves with a power output of 75 W. Find the intensity level in decibels at that distance.
A fission reactor produces 1300MW of electric power. Assume it operates at 40% efficiency, with an average of 200 MeV produced in each fission event. At what rate is the 235U fuel consumed
A converging lens of focal length 0.187 m forms a virtual image of an object. What is the distance between the object and the lens
A disc is rotating about its center. A mosquito sits on the disc at a distance of 20 cm from the center and has a linear speed tangential to the circular motion of 32 cm/s. What is the speed of rotation of the disc
what volume should the balloon have after being inflated. Billiard ball A of mass mA=0.400kg moving with speed vA=1.80m/s strikes ball B, initially at rest of mass mB=0.500kg. As a result of collision, ball A is deflected off at an angle of 30.0 deg..
A 2680 satellite used in a cellular telephone network is in a circular orbit at a height of 800 above the surface of the earth. What fraction is this force of the satellite's weight at the surface of the earth
The wavelength of an electromagnetic wave is measured to be 2.50 x 10-7 m. What is the frequency of the wave?
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