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Question: A Douglas fir beam 10 by 12 in dressed size and 14 ft long is supported at the ends. The beam carries a total uniform load of 9000 lb and a concentrated load at the middle of the span of 3600 lb.
a. What will be the maximum bending stress, shearing stress, and deflection?
b. Are the values within safe limits?
In February 1955, a paratrooper fell 365 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. What is the magnitude of the impulse on him from the snow
stunt pilots and fighter pilots who fly at high speeds in a downward-curving arc may experience a red out in which
What are the components of the ships displacement
A network of capacitors is mostly inside a sealed box, buit one capacitor Cx is sticking out, as shown in the figure. When you connect a multimeter across points a and b, it reads 27.0 uF. What is Cx?
A piston-cylinder assembly contains 2 lb of water, initiall, at 100 lbf/in.2 and 400°F. The water undergoes two processe: in series: a constant-pressure process followed by a constant volume process. At the end of the constant-volume process the temp..
Two 9cm diameter charged disks face each other, 25cm apart. Both disks are charged to - 80 nC.
Setting a world record in a 100 m race, Maggie and Judy cross the finish line in a dead heat, both taking 9.0 s. Accelerating uniformly, Maggie took 2.00 s and Judy 2.40 s to attain maximum speed, which they maintained for the rest of the race.
The common isotope of uranium, 238U , has a half life of 4.50 x 109 years, decaying by alpha emission. a) What is the decay constant? b) What mass of uranium would be required for an activity of one Curie? c) How many alpha-particles are emitted p..
A beam of light traveling in water (n=1.33) is incident on a glass surface (n=1.52). At what angle of incidence will the outgoing light be fully polarized?
4 moles of an ideal gas have an initial temperature of 127 C. The temperature of the gas is kept constant and the volume is increases until the pressure drops to 40.0% of its original value. Calculate the heat added to the gas
At what temperature (in Celcius) is the rms speeds of helium atoms half its value at STP? (STP = Standard Pressure and Temperature, which means T = 0 Celcius and P = 1 atmosphere) At what temperature (in Celcius) is the rms speed of helium atoms twic..
A puck with mass m = 0.18 kg slides along a frictionless horizontal surface at v = 6.3 m/s . It hits and sticks to the free end of a spring with k = 18 N/m, Find the period of the subsequent simple harmonic motion
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