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kykrilka [37]
3 years ago
9

Please help me! I’m desperate

Mathematics
1 answer:
arlik [135]3 years ago
7 0

Answer:

  (a) d = 0.012v^2

  (b) 4.8 m

  (c) 25 m/s

Step-by-step explanation:

(a) Writing an equation to fit a bunch of data is often a matter of trial and error. You can often get an idea of the sort of function that is involved by graphing the data points.*

When we do that, we see the relationship is non-linear with an upward curvature. It might be described by a polynomial or exponential function.

When we try a quadratic equation, we find the fit is really quite good. The graphing calculator that does this quadratic regression analysis tells us the equation is essentially ...

  d = 0.012·v^2

__

(b) The equation predicts a depth of 4.8 m.

  d = 0.012·20^2 = 4.8

__

(c) Solving for speed, we get a speed of 25 m/s.

  7.5 = 0.012v^2

  625 = v^2 . . . . . . divide by .012

  25 = v . . . . . . . . . take the square root

_____

* The energy of a falling object is proportional to the square of its speed. If we assume that the depth of penetration into the clay is proportional to the energy absorbed, then it is not surprising to see a quadratic relationship between speed and distance. What is surprising is that this relationship would show up in middle school math problem, not a high-school physics problem.

Essentially, you have to assume the form of the equation, then find the coefficients that make it so. Working with the evenly spaced table values of 5, 10, 15 m/s can simplify the effort.

A graphing calculator or spreadsheet can do the bulk of the work once the data is entered.

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42=Wf×64 (what fraction)
Dmitry [639]
So basically 42=x times 64 or 42=64x where you want x to be represented as a fraction so just don't simplify as much

42=64x
divide both sdies by 64
42/64=64/64x
42/64=1x
x=42/64
simplify
42/64=21/32

the answer is 21/32 in simplest form
7 0
3 years ago
Please help i will give brainliest!!
Phantasy [73]

Answer:

24 zeroes love yalll pls give brainliest

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Two cars travel along a highway at the same speed.
Mazyrski [523]

Answer:

30 mins

Step-by-step explanation:

<em>speed = distance/ time </em>

speed of car A

= 20/ 12 km/ min

= 5/ 3 km/ min

also, speed of car A = speed of car B

speed of car B = 5/ 3 km/ min = 50km / time taken (in mins)

\frac{5}{3}  =  \frac{50}{t}

5t  = 150

t = 30

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6 0
3 years ago
3(2 + f) = -15<br><br>A. 3<br>B. 7<br>C. -3<br>D. -7​
Scilla [17]

Answer:

D. (-7)

Step-by-step explanation:

3(2 + f) = (-15)

(3 . 2) + (3 . f) = (-15)

6 + 3f = (-15)

3f = (-15) - 6

3f = (-21)

f = (-21)/3

f = (-7)

5 0
2 years ago
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Two integers, a and b have a product of 15. what is the least possible sum of a and b?
Neporo4naja [7]
If they're integers, that means they can't be fractions (such as 15/2 and 2).

So the only couples of integers that, when multiplied, result in 15 are:

1 and 15
5 and 3.

(there are no other possibilities as both 5 and 3 are not divisible further).
The smaller of the two sums (15+1; 5+3) is 5+3=8.

The least possible sum of a and b is 8.
7 0
3 years ago
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