A moving part that fits closely in a cylinder to either pressurize a liquid or compress a gas is a:
A. piston
B. fulcrum
C. pushrod
D. jack handle
Answer: A
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If a lever requires an effort of 60 lbs. to move a load of 140 lbs., what is the mechanical advantage?
What will be an ideal response?
Which of the following is an advantage of a tongue and groove, laminated oak floor in a unibody semi-trailer?
A. tough and weather resistant B. adds to structural integrity of frame C. withstands forklift truck and skid abuse D. all of the above
Technician A says that drive axle wheel lock under braking is a major cause of trailer jackknife. Technician B says that even a basic 2S/2M tractor ABS can help reduce jackknife incidents.
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
For the circuit shown in Figure P5.41, assume that switches S1 and S2 have been held open and closed, respectively, for a long time prior to t = 0. Then, simultaneously at t = 0, S1 closes and S2 opens. Also
assume
R1 = 5?, R2 = 4?, R3 = 3?, R4 = 6?, and
C1 = C2 = 4F.
a. Find the capacitor voltage vC at t = 0+.
b. Find the time constant ? for t > 0.
c. Find vC for all time and sketch the function.
d. Evaluate the ratio vC to vC (?) at each of the following times: t = 0, ?, 2?, 5?, 10? .
