1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aliya0001 [1]
3 years ago
14

A ladder rests against a vertical wall at an inclination Alfa to the horizontal. It's foot is pulled away from the wall through

distance p so that its upper end sides a distance q down the wall and then the ladder makes an angle bita to the horizontal,show that p/q=cos Bita-cos alfa/sin Alfa-sin bita
Mathematics
2 answers:
Tresset [83]3 years ago
7 0

I assume you have a drawing of this problem. If not, then draw it this way.

Draw a vertical segment on the left side of the paper. Starting at the lower endpoint, draw a horizontal segment to the right. You now have the wall and the floor. Now draw a slant segment connecting the two segments. This is the ladder. Mark the lower right acute angle alpha. Now using the same length segment, draw a new segment connecting the perpendicular ones a little lower on the wall than the previous one. It will end up on the floor to the right of the previous one. Label the distance between the segments on the wall q and the distance between the endpoints of the slant segments on the floor p. Now label the distance from the lower endpoint on the wall to the floor r, and the distance from the left endpoint on the wall to the wall s. The length of both slant segments is t.

We need to use sines and cosines to find expressions for p and q.

We'll start with sine and q.

\sin \alpha = \dfrac{q + r}{t}

q + r = t \sin \alpha

\sin \beta = \dfrac{r}{t}

r = t \sin \beta

Now we subtract the expression for r from the expression for q + r.

q + r - r = t \sin \alpha - t \sin \beta

q = t (\sin \alpha - \sin \beta)

We have an expression for q in terms of the length of the ladder, t, and the angles alpha and beta.

Now we work on p by using the cosine of the angles.

\cos \alpha = \dfrac{s}{t}

s = t \cos \alpha

\cos \beta = \dfrac{p + s}{t}

p + s = t \cos \beta

Now we subtract the expression for s from the expression for p + s.

p + s - s = t \cos \beta - t \cos \alpha

p = t(\cos \beta - \cos \alpha)

Now we have an expression for p in terms of t and the angles alpha and beta.

To find the ratio of p to q, we divide their expressions.

\dfrac{p}{q} = \dfrac{t(\cos \beta - \cos \alpha)}{t (\sin \alpha - \sin \beta)}

Cancel out t to get:

\dfrac{p}{q} = \dfrac{\cos \beta - \cos \alpha}{\sin \alpha - \sin \beta}

mestny [16]3 years ago
3 0
I would help if I knew but this beyond my level,even though I am really good at math.
You might be interested in
Which answer choice shows a solution set in which all values, when input for x, will be true?
Likurg_2 [28]
Dhsfmarkssgkafnafbwfjwtj
3 0
3 years ago
Find the measure of an angle which is 14 degree less than three times its complement. plzzz answer
BlackZzzverrR [31]
Angle: x
complement: 90-x

3x=90-x-14
4x=76
x = 19
90-x= 71
7 0
3 years ago
Find a8 when a1 = 40,000, r = 0.1
Sindrei [870]

Answer:

a8 = 0.004

Step-by-step explanation:

Q is abt a geometric series given by the eqn: an = a1*r^(n-1)

given a1 = 40000, r = 0.1

an = 40000*(0.1)^(n-1)

a8 = 40000*(0.1)^(8-1)

= 40000*(0.1)^7

= 0.004


3 0
3 years ago
Read 2 more answers
What is the answer to x2+4x +3 =0?
adell [148]
(x+1) (x+3)
the zeroes of the function are negative 1 and negative 3
8 0
3 years ago
Moira does one-half of a homework assignment on Monday. On Tuesday, Wednesday, and Thursday, she does one-half of the homework s
gladu [14]
1/32
Monday 1/2
Tuesday 1/4
Wednesday 1/8
Thursday 1/16
Friday 1/32
All you have to do is multiply 1/2 to every one till you get to friday
8 0
3 years ago
Read 2 more answers
Other questions:
  • Which expression has a value that is more than its base?
    15·1 answer
  • 15 POINTS!!!!!!! A music store has 500 guitar picks. They order 15 boxes with 9 picks each. They sell 19 boxes that have 10 pick
    10·1 answer
  • I need your help with this question please explain why and show work.
    10·2 answers
  • Perform the operation x-y/2 - x+y/3
    6·1 answer
  • What is the sum of (x+5)+(2x+3)
    12·1 answer
  • Use De Morgan's laws to write an equivalent statement for the sentence. The bus does not have an engine or the people do not hav
    9·1 answer
  • ASAP I HAVE A MATH FINAL PLEASE
    12·1 answer
  • A number that has both a whole number and a fraction is called a(n)
    11·1 answer
  • ASAP HELP you have $125 dollars in a savings account and you deposit an equal amount into your account each week. After 5 weeks
    8·1 answer
  • Please help!!!!!!
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!