Problem 1.121
At the instant shown, the velocity and acceleration vectors of the airplane have the fol
lowing expressions:
i3=(215+332f)ft/s and &=(190i+76.0j)ft/s2.
Use Eq. (1.17) on p. 8 to determine the angle gt, the smaller of the two angles formed b
Problem 1.7ll
The velocity of the car has the following representation: 5 = (8.307 + 0.726 j) m/s. Detennine the
magnitude of E. In addition. knowing that the angle 0 describes the orientation of 5. determine 0 and
express its value in degrees.
Solution
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g? Problem 2*! 9
If 6; is the average velociiy of a point P over a given time interval, is 53%, the magnitude of me average
velocity, equal to the average speed of P ever the time interval in question?
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time interval A! such that the departure and a
Dimensions, Units, Conversions, and Significant Digits
Physical quantities in Engineering have:
1.
2.
3.
4.
5.
Names
Values or Numbers
Dimensions
Units (SI or USCS)
Significant Digits
Dimensions and Units
Dimensions: the abstract quality of a measurement
Free Body Diagram
Example
Draw FBD of each of the books
B
C
Free Body Diagram Practice
Create a FBD for the sled and for the sled with children pictured below.
Cable Support with Pulley
Cable, rope, chain Replace with a tension force only.
BuiltInEnd S