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1.A carpenter uses a hammer to strike a nail. Approximate the hammer's weight of 1.8lbs, as being concentrated at the head, and assume that at impact the head is traveling in the -j direction. If the hammer contacts the nail at 50mph and the impact occurs over 0.023 seconds, what is the magnitude of the average force exerted by the nail of the hammer?
2.A closed tank of liquid (S=1.2) is rotated about a vertical axis (see figure), and at the same time the entire tank is accelerated upward at 4 m/s^2. If the rate of rotation is 10 rad/s, what is the difference in pressure between points A and B (pB-pA)? Point B is at the bottom of the tank at a radius of .5 m from the axis of rotation, and point A is at the top on the axis of rotation.
3.A 5-micron droplet of water is being carried in standard air toward a 500-micron drop of water at a relative velocity of 40m/s. Will the two drops collide?
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Given an aluminum simply supported beam with overhang, determine the applied load at the free end with a max deflection of 1". b= 1" h= 0.25" L=12" l= 24" E= 10,000 ksi
A three span continuous beam has spans of 27, 30, and 27 feet. The beams support one-way slabs, 6 inches thick that span 20 feet center to center. Assume that the beams are 16 inches wide and 24 inches deep.
The river flow at an upstream gauging station is measured to be 1500 m3/s, and at another gauging station 3 km downstream, the discharge is measured to be 750 m3/s at the same instant of time.
how many pounds of coal must be burned to keep one 100 watt light bulb lit for one hour. Assume efficiency of the power plant is 35%, the transmission losses are 10% fo the delivered poer, and the heating value of coal is 12,000 BTU/lb
A heat pump that operates on the ideal vapor compression cycle with refrigerant 134a is used to heat water from 16 to 56 degrees Celsius at a rate of 0.20kg/s. The condensor and evaporator pressures are 1.5 and 0.35 Mpa, respectively.
(1) a constant wind velocity that is twice the mean wind velocity and operating half the time; and (2) a constant wind velocity that is three times the mean wind velocity operating one-third of the time.
To satisfy desige limitation it is necessary to determine the effect of the 2- kN tension in the cable on the shear tension and bending of the fixed I-beam.
A hospital waste containing 0.7µCi/L of 32P is to be disposed of. How long must the radioisotope be held to meet the allowable discharge activity
Calculate the following for the bar:a) engineering stress at 0.001 (0.1%) strain, b) elongation, c) Young's modulus, d) final diameter of the bar Note: Poisson's ratio is 0.31 for 4140 steel, e) true stress, f) true strain.
the stress at a point is shown on the element. Determine the principal stresses and the absolute maximum shear stress.
A 2-inch diameter glass pipe is connected to a pipe network in which the pressure is 70 psig. If the length is 300 ft and the outlet is 10 ft above the pipe, determine the flow rate.
Transcranial magnetic stimulation (TMS) is a noninvasive techniqueused to stimulate regions of the human brain. A small coil isplaced on the scalp, and a brief burst of current in the coilproduces a rapidly changing magnetic field inside the brain. T..
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