A road has a 10% grade. a.) What is the angle of elevation of the road? b.) If the road is 2 km. long, how much does it rise?

Question

lastdaywork · Answer

Do you know what does "A road has a 10% grade." imply??

anonymous · Answer

no, it just says to find the angle of elevation probably using sin cosin or tangent

lastdaywork · Answer

Read - http://en.wikipedia.org/wiki/Grade_%28slope%29 Now can you tell me the angle of elevation ??

lastdaywork · Answer

Actually, just see the equations - http://en.wikipedia.org/wiki/Grade_%28slope%29#Equations

anonymous · Answer

thats just more confusing ):

lastdaywork · Answer

Okay..the relation between the grade and angle of elevation is as follows:
Grade (in %) = tan(x) * 100

Now can you tell me the value of x ??

anonymous · Answer

no, the way i was taught was using triangles and pictures but this problem doesn't have a picture and my notes have nothing about anything with a grade

campbell_st · Answer

here is a simple concept... 

10% grade... 

so it rises 1 for every 10 that the road runs

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since 1/10 = 10%

so 

tan(x) = 1/10      

easy to find x now

anonymous · Answer

5.7?

campbell_st · Answer

ok... so the angle is correct... 

so for part (b) 

the question is now

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so you now need cos to find a  sin and b 

hope it helps

campbell_st · Answer

you may need to change 2km to 2000 metres

anonymous · Answer

a=1990
b=199

anonymous · Answer

troroorororrorolololo people hello fron ua

campbell_st · Answer

well not quite

for a  you need cos

cos(5.7) = a/2000

so a = 2000*cos(5.7)

and for b  its sin

sin(5.7) = b/2000

b = 2000*sin(5.7)

hope it helps

anonymous · Answer

troroorororrorolololo people hello fron ua

anonymous · Answer

its trololololololololololololololololololololo not trorororororororororororororo pavlo fail
 picasso

anonymous · Answer

pikagirl

anonymous · Answer

its pikachu

anonymous · Answer

nonon it is pikagirl

anonymous · Answer

nononononono you no understand, its pikachu not pikagirl you pavlo fail picasso

anonymous · Answer

i have no idea thanks anyways @campbell_st

anonymous · Answer

you are welcome

anonymous · Answer

you're welcome

campbell_st · Answer

@ileah I just checked your answers and they are correct... 

sorry for the misinformation

anonymous · Answer

you mader traker i will kill you

anonymous · Answer

thanks (: @campbell_st but im still not sure what the answer would be. i need to know how much it will rise

campbell_st · Answer

well you posted 1990 for the run and 199 for the rise they are correct

anonymous · Answer

okay(: @campbell_st would you mind helping me with another problem?

campbell_st · Answer

Sorry I have to go... there are plenty of people who can help... just page some of the high number people.

anonymous · Answer

thanks