# Engineering

## The Hoover Dam, in Arizona, encloses Lake Mead, which contains 10 trillion gallons of water. The dam is 1200 ft wide and the lake is 500 ft deep. ( a ) Estimate the hydrostatic force on the dam, in MN. ( b ) Explain how you might analyze the stress in the dam due to this hydrostatic force.

The Hoover Dam, in Arizona, encloses Lake Mead,which contains 10 trillion gallons of water. The dam is1200 ft wide and the lake is 500 ft deep. ( a ) Estimate thehydrostatic force on the dam, in MN. ( b ) Explain howyou might analyze the stress in the dam due to this hydrostaticforce. EXPERT ANSWER

## Dynamics: the slender rod has a mass m and is suspended at its end A by a cord. If the rod receives a horizontal blow giving it an impulse I at its bottom B determine the location y of the point P about which the rod appears to rotate during the impact. Express your answer in terms of some or all variables m, I l and appropriate constants.

Dynamics: the slender rod has a mass m and is suspended at its end A by a cord. If the rod receives a horizontal blow giving it an impulse I at its bottom B determine the location y of the point P about which the rod appears to rotate during the impact. Express your answer …

## 18. Zoom in on the map. Find the pin for Mormon’s Crossing. Which road crosses Oak Creek at this location? 19. Given that Page Springs Cellars offers Rhone-style wines, would Page Springs Cellars have a similar climate to the Rhone River in France? Explain your thoughts. 20. Name three animals that are found in the Lower Verde area.

EXPERT ANSWER 1.Mormons Crossing is a little area along Oak Creek in Cornville, Arizona. Along this creek there are several holes deep enough to swim in, some rapids, and even a rope swing. It’s a great spot to cool off, with plenty of trees shading this riparian beauty. There is a new way for you …

## A control system with negative unity feedback has a process G(s) 400/s(s + 40) and we wish to use proportional plus integral compensation, where Gc(s) = KP + K1/ s Note that the steady-state error of this system for a ramp input is zero, (a) Set K/ = 1 and find a suitable value of KP so the step response will have an overshoot of approximately 20%. (b) What is the expected settling time (within 2% settling criterion) of the companseted system.

A control system with negative unity feedback has a process G(s) 400/s(s + 40) and we wish to use proportional plus integral compensation, where Gc(s) = KP + K1/ s Note that the steady-state error of this system for a ramp input is zero, (a) Set K/ = 1 and find a suitable value of …

## Two blocks of mass m1 = 2.00 kg and m2 = 6.00 kg on a frictionless table are connected by a massless string. Forces of magnitude F1 = 10.0N and F2 = 5.00N are applied as shown. The string remains taught during the motion. (a) Draw a free body diagram for each block. (b) Draw a free body diagram for the blocks and string treated as one system. (c) What is the acceleration of the blocks? (d) What is the tension in the string?(e) What are the normal forces exerted by the table on each block? (f) What is the net force (direction and magnitude) acting on m2

EXPERT ANSWER Normal force on m2 = m2g = 6*9.8 = 58.8 NNetforce on m2, F = F2 + T = 5 + 6.25 = 11.25 N in thr + ve X axis direction