Mathematics : asked on 60744
 06.08.2020

A ramp has an angle of inclination of 20 degrees. it has a vertical height of 1.8 m. what is the length, l metres, of the ramp?

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24.06.2023, solved by verified expert
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x = 5.26 m

Step-by-step explanation:

Given that,

The angle of inclination = 20°

The vertical height of the ramp, h = 1.8 m

We need to find the length of the ramp. Let it is x.

We can find it using trigonometry. So,

A ramp has an angle of inclination of 20 degrees., №17886644, 06.08.2020 20:49

We have,

P = 1.8 m, H = x

A ramp has an angle of inclination of 20 degrees., №17886644, 06.08.2020 20:49

So, the length of the ramp is 5.26 m.

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Mathematics
Step-by-step answer
P Answered by PhD

x = 5.26 m

Step-by-step explanation:

Given that,

The angle of inclination = 20°

The vertical height of the ramp, h = 1.8 m

We need to find the length of the ramp. Let it is x.

We can find it using trigonometry. So,

\sin\theta=\dfrac{P}{H}

We have,

P = 1.8 m, H = x

\sin20=\dfrac{1.8}{x}\\\\x=\dfrac{1.8}{\sin20}\\\\x=5.26\ m

So, the length of the ramp is 5.26 m.

Mathematics
Step-by-step answer
P Answered by Specialist

1. The given triangle ABC, has a right angle at C, BC=11, and B=30\degree

\tan 30\degree=\frac{AC}{11}

AC=11\tan 30\degree

AC=\frac{11\sqrt{3}}{3}

Ans: A

2. The reference angle is the angle the terminal side makes with x-axis.

-\frac{33\pi}{8}=-4\frac{\pi}{8}

This implies that, -\frac{33\pi}{8} has a reference angle of \frac{\pi}{8}.

Ans: C

3. Let x be the shortest distance the ramp can span.

From the diagram; \tan (4.76\degree)=\frac{2.5}{x}

\implies x=\frac{2.5}{\tan (4.76\degree)}

\implies x=30.0ft

Ans:B

4. Use the Pythagorean identity: 1+\tan ^2 \theta=\sec^2 \theta.

If \cot \theta=-\frac{1}{2},then  \tan \theta=-2

\implies 1+2^2=\sec^2 \theta

\implies \sec^2 \theta=5

\implies \sec \theta=-\sqrt{5}, In QII, the secant ratio is negative.

Ans:C

5. We have \sin \frac{2\pi}{3}=\frac{\sqrt{3} }{2}

\cos \frac{\pi}{6}=\frac{\sqrt{3} }{2}

\cos \frac{\pi}{3}=\frac{1}{2}

\sin \frac{5\pi}{3}=-\frac{\sqrt{3} }{2}

\cos \frac{7\pi}{6}=-\frac{\sqrt{3} }{2}

\cos \frac{11\pi}{6}=\frac{\sqrt{3} }{2}

Ans:A and D

6.  The given function that is equivalent to f(x)=\sin x is f(x)=\cos (-x+\frac{\pi}{2}).

When we reflect the graph of  f(x)=\cos (x)  in the y-axis and shift it to the left by  \frac{\pi}{2} units, it coincides with graph of f(x)=\sin x.

Ans:C

7. The function y=\tan x is a one-to-one function on the interval [-\frac{\pi}{2},\frac{\pi}{2}]

When we restrict the domain of  y=\tan x on [-\frac{\pi}{2},\frac{\pi}{2}] it becomes an invertible function.

Ans: C

8. The given function is y=3\sin(4x-\pi)

The horizontal shift is given by \frac{C}{B}=\frac{\pi}{4}

The direction of the shift is to the right.

Ans:D

9.  \cos(-75\degree)=\cos(75\degree) by the symmetric property of even functions.

\cos(75\degree)=\cos(45\degree+30\degree)

\cos(75\degree)=\cos(45\degree) \cos30\degree-\sin(45\degree) \sin30\degree

\cos(75\degree)=\frac{\sqrt{2} }{2} \times \frac{\sqrt{3} }{2} -\frac{\sqrt{2} }{2} \times \frac{1}{2}

\cos(75\degree)=\frac{\sqrt{6}-\sqrt{2}}{4}

Ans: B

10. Recall the cosine rule: a^2=b^2+c^2-2bc\cos A

Let the angle measure opposite to the longest side be A, then a=19,b=17, and c=15.

\Rightarrow 19^2=17^2+15^2-2(17)(15)\cos A

\implies -153=-510\cos A

\implies \cos A=0.3

\implies A=\cos^{-1}(0.3)=73\degree

Ans:B

11.  We want to solve 2\sin(2x)\cos(x)-\sin(2x)=0 on the interval;

[-\frac{\pi}{2},\frac{\pi}{2}]

Factor:  \sin2(x)[2\cos(x)-1)=0

Either \sin(2x)=0 \implies x=0\frac{\pi}{2}

Or [2\cos x-1=0 This means that x=\frac{\pi}{3},-\frac{\pi}{3}

Therefore required solution is x=-\frac{\pi}{3},0,\frac{\pi}{3},\frac{\pi}{2}

Ans:D

12. Use the relation:r=\sqrt{x^2+y^2} and \theta=\tan^{-1}(\frac{y}{x})=

The given rectangular coordinate is (1,-2)

This implies that:r=\sqrt{1^2+(-2)^2}=\sqrt{5}

\theta=\tan^{-1}(\frac{-2}{1})= This means  \theta=116.6 or \theta=296.6

The polar forms are: -\sqrt{5},116.6 and \sqrt{5},296.6

Ans: B and C

13.  The polar equation that represents an ellipse is

r=\frac{2}{2-\sin \theta}.

When written in standard form; r=\frac{1}{1-0.5\sin \theta}.

The eccentricity is 0.5\:.

Therefore the r=\frac{2}{2-\sin \theta} is an ellipse.

Ans: B

14. The DeMoivre’s Theorem states that;

(\cos \theta+i\sin \theta)^n=\cos n\theta+i\sin n\theta

This implies that:

[2(\cos \frac{\pi}{9}+i\sin \frac{\pi}{9})]^3=2^3\cos 3\times \frac{\pi}{9}+i\sin 3\times \frac{\pi}{9})

[2(\cos \frac{\pi}{9}+i\sin \frac{\pi}{9})]^3=8(frac{2}{2})+i8(\frac{\sqrt{3}}{2})=4+4\sqrt{3}i

Ans: A

15. Let the initial point be (x,y), Then |v|=\sqrt{(-2-x)^2+(4-y)^2}.

If x=-8, and y=-4.

Then, |v|=\sqrt{(-2--8)^2+(4--4)^2}.

|v|=\sqrt{(-6)^2+(8)^2}=\sqrt{100}=10.

Ans: B

16. We find the dot product to see if it is zero.

u\bullet v=-6(7)+4(10)=-2

Since the dot product is not zero the vectors are not orthogonal

\theta=\cos ^{-1}(\frac{u\bullet v}{|u||v|})

\theta=\cos ^{-1}(-\frac{2}{2\sqrt{13}\times \sqrt{1149} }) =91.3\degree

Ans:B

17. Given v=5i+4j, w=2i-3j.

u=v+w

Add corresponding components

This implies u=(5i+4j)+(2i-3j)

u=(5i+2i+4j-3j)

u=7i+j

Ans:B

See attachment.


1. in abc, c is a right angle and bc= 11. if the measure of angle b= 30degrees, find ac. a) (11sqrt3
1. in abc, c is a right angle and bc= 11. if the measure of angle b= 30degrees, find ac. a) (11sqrt3
Physics
Step-by-step answer
P Answered by Master

Explanation:

The parametric equations of the cyclist are:

x(t)=100tcos(A)\\\\y(t)=-16t^2+100tsin(A)+10   (1)

A) The horizontal velocity is the derivative of x(t), in time:

x'(t)=100cos(A)

B) For A=20° the horizontal velocity is:

v_x=x'(t)=100cos(20\°)=93.9692ft/s

For A=45°:

v_x=100cos(45\°)=70.7106ft/s

C) To find the time in which the vertical velocity is zero you first obtain the derivative of, in time:

v_y=y'(t)=-32t+100sin(A)+10

Next, you equal the vertical velocity to zero and solve for time t:

-32t+100sin(A)+10=0\\\\t=\frac{100sin(A)+10}{32}

D) The maximum height is reached when the derivative of y (height) is zero. You use the previous value of t in the equation (1), equals y to 35. Next, you  solve for t:

y=35\\\\-16(\frac{100sin(A)+10}{32})^2+100(\frac{10sin(A)+10}{32})sinA+10=35\\\\-\frac{16}{1024}(10000sin^2A+2000sinA+100)+31.25sin^2A+31.25sinA+10=35\\\\-156.25sin^2A-31.25sinA-1.5625+31.25sin^2A+31.25sinA+10=35\\\\-125sin^2A-26.5625=0

Physics
Step-by-step answer
P Answered by Specialist

Explanation:

The parametric equations of the cyclist are:

x(t)=100tcos(A)\\\\y(t)=-16t^2+100tsin(A)+10   (1)

A) The horizontal velocity is the derivative of x(t), in time:

x'(t)=100cos(A)

B) For A=20° the horizontal velocity is:

v_x=x'(t)=100cos(20\°)=93.9692ft/s

For A=45°:

v_x=100cos(45\°)=70.7106ft/s

C) To find the time in which the vertical velocity is zero you first obtain the derivative of, in time:

v_y=y'(t)=-32t+100sin(A)+10

Next, you equal the vertical velocity to zero and solve for time t:

-32t+100sin(A)+10=0\\\\t=\frac{100sin(A)+10}{32}

D) The maximum height is reached when the derivative of y (height) is zero. You use the previous value of t in the equation (1), equals y to 35. Next, you  solve for t:

y=35\\\\-16(\frac{100sin(A)+10}{32})^2+100(\frac{10sin(A)+10}{32})sinA+10=35\\\\-\frac{16}{1024}(10000sin^2A+2000sinA+100)+31.25sin^2A+31.25sinA+10=35\\\\-156.25sin^2A-31.25sinA-1.5625+31.25sin^2A+31.25sinA+10=35\\\\-125sin^2A-26.5625=0

Mathematics
Step-by-step answer
P Answered by PhD

Cost of 7 gallons=$24.50

Cost of 1 gallon=24.50/7=3.5

Cost of 15 gallons=15*3.5=52.5

Cost of 15 gallons will be $52.5

Mathematics
Step-by-step answer
P Answered by PhD

For every 8 cars there are 7 trucks

Therefore,

Cars:Truck=8:7

Answer is B)8:7

Mathematics
Step-by-step answer
P Answered by PhD

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

Mathematics
Step-by-step answer
P Answered by PhD
The answer is in the image 

The answer is in the image 

Mathematics
Step-by-step answer
P Answered by PhD

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

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