Allowed: Pencils, calculator (no physics, engineering or math \"modules not netw

Question

Allowed: Pencils, calculator (no physics, engineering or math "modules not network capable), ruler, formula sheet, scratch paper. NOT allowed: cell phones, wifi or other network-enabled devices. Silence all electronic devices and place them below the table. Plan your time: 50 min. Short-problem section: 4 pts. each. 1. The weight of a 6.54-teragram object is 27 6.5 122 soooooo 1,44 EID 2. Convert the following to the equivalent type of quantity in SI units: 24 microns- (A micron is a micro-inch.) DE 3. A car travels 145 km at 15.0 m/s, then 50.0 km at 20.5 m/s. Calculate the average speed Answer: A X. 145 O 4, Vector R: 7.25 m at 45° north of west; vector R 4.55 m east. Determine the x and y components of the sum. y comp: x comp

Explanation / Answer

1 tera gram is weight unit and 1 teragram = 1x10-9 kg

6.54 tera gram equals to 6.54 x10-9 KG

2

1 micron = 10-6 m

24 micron =.000024 m

3.

time=distance/velocity

t1 =145 x1000/15=9666.6 sec

t2=50x1000/20.5=2439

total time =t1+t2

=12105.6

average velocity = total distance/time

                       =(150+50)x1000/(12105.6) =16.52 m/sec

4) assuming N is y and E is x

r1= -7.25cos45x+7.25sin45y

R2 =4.55x

sum =r1+r2

=-0.57575 x+5.125 y

so x component = -0.5757

and y component = 5.125

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