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an operator is holding a tool for a horizontal drilling task. the woman's elbow is flexed 45 degrees. The length of her forearm is 0.4m and the drill has mass of 5kg. Her forearm/hand weighs 20N and its center of mass is half the distance between the tool and the joint center.
a) what is the reaction force at the joint? be sure to draw and label the free body diagram of the system.
b) qualitatively describe how the muscle force would change if the elbow was flexed 90 degrees from vertical?
Calculate the relative velocity of a solute front that is flowing through an aquifer. The organic carbon partitioning coefficient (Koc) is 6 mL/g and the friction of organic carbon in the soil is 2%.
The "supersoaker" water gun can shoot more than 30 ft in the horizontal direction. Estimate the minimum pressure, , needed in the chamber in order to accomplish this. List all assumptions and show all calculations.
Suppose a drainage basin has an area of 288 acres with a CN=55(Runoff Coef. of 0.30). Determine the peak discharge (in cfs) that would result from a 6.0in., 24-hr assuming there are no ponds and swampy areas.
A rear-wheel-drive 3000lb drag race car has a 200-inch wheel base and a center of gravity 20 inches above the pavement and 140 inches behind the front axle. The owners wish to achieve an initial acceleration from rest of 15 ft/s on a level paved s..
A sample of undisturbed soil has a dry weight of 10 lb and volumen of 1 ft^3. If the specific gravity of the soil solids is 2.65, determine the void ratio and the porosity.
The beam is fully restrained at both ends but is unbraced along its span. Determine the maximum magnitude of PQ that satisfies the ultimate strength limit state for flexural strength
Shaquille O Neal, who is listed as 7`1" tall is out of the NBA Playoffs and so has time to visit is pool. If he stands vertically in the water, completely submerged
An entrepreneurial new civil engineering graduate started a lab for testing endocrine disrupting compounds. The lab just broke even the first year, but in years 2 through 5, it made a profit of $97,000 each year.
If the toluene concentration in the water supply is 1,000 ppb, the treatment objective is 5 ppb, and the flow of water is 378 L/min (100 gpm), what mass of PAC must be placed in a contact basin on a daily basis to satisfy the treatment objective
A 10 kg block is being pulled down a slope with an angle of 20 degrees and has a velocity of .2 m/s. Determine the force required
The true bearing of the line a-b is S 88*50' W, the magnetic bearing of the line d-c is N 89*45' E. What is the magnetic declination
An aluminum link is subjected to axial tension. The loading is limited by the conditions of not yielding and not elongating excessively. The yield limit is satisfied if the stress remains below 50%of the 325M Payield stress.
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