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castortr0y [4]
2 years ago
8

Please help! I'll mark your answer as brainliest if right <3

Mathematics
1 answer:
sweet [91]2 years ago
6 0

Step-by-step explanation:

sorry but mujhe eska answer Nahi petta

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An object falls freely in a straight line and experiences air resistance proportional to its? speed; this means its acceleration
KiRa [710]

Answer:

t = 1.068 s

Step-by-step explanation:

given,

a(t) =- k v(t)

speed of the object decreases from 800 ft/s to 700 ft/s

distance = 1400 ft

time for deceleration = ?

a(t) =- k v(t)

\dfrac{dv}{dt}= - kv

\dfrac{dv}{v}= - kdt

integrating both side

\int_{800}^{700}\dfrac{dv}{v}= - k\int dt

ln(\dfrac{7}{8})=-kt

t = -\dfrac{1}{k}ln(\dfrac{7}{8})..........(1)

since,

v = v_1e^{-kt}

\dfrac{ds}{dt} = 800e^{-kt}

\int ds= 800\int_0^t e^{-kt}dt

1400= -\dfrac{800}{k}[e^{-kt}-e^0]

from equation 1

k= -\dfrac{8}{14}[\dfrac{7}{8}-1]

k= \dfrac{1}{8}

putting value of k in equation (1)

t = -8ln(\dfrac{7}{8})

t = 1.068 s

5 0
3 years ago
The y-intercept of the function f(x) = x2+3x+2
sveta [45]

Question

The y-intercept of the function f(x) = x2+3x+2

Answer:

4 + 3x

5 0
2 years ago
What is the measure of
LenKa [72]

Answer:

C. Ф = 4 radians

Step-by-step explanation:

Given,

Radius of the Circle (r) = 3cm

Length of the Arc (S) = 12cm

In any circle of radius r, the arc length S to the circumference equals the ratio of the angle θ subtended by the arc at the centre and the angle in one revolution. Thus, measuring the angles in radians, S=rθ.

Therefore, S = r*Ф

12 = 3*Ф

Hence, Ф = 4 radians

Read more at below link:

brainly.com/question/16878090

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3 0
2 years ago
Plz help me i'll give points and brainliest
RoseWind [281]

Step-by-step explanation:

-1,6 is -1 left 6 up

1,-6 is 1 right -6 down

6,-1 is 6 right -1 down

3 0
3 years ago
2/3÷2 1/3= dividing fractions
wolverine [178]

Answer:

3/3

Step-by-step explanation:

3/3

4 0
3 years ago
Read 2 more answers
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