Answer:
145.54$
Step-by-step explanation:
Hope this help! <3
-1/5 divided by 7/4 show the work!
Answer:
-4/35
Step-by-step explanation:
-1/5 divided by 7/4
Do KCF or Keep change flip.
New equation: -1/5 times 4/7
1*4 is 4 and 5*7 is 35
Keep the negative sign.
Your answer is -4/35
PLEASE NEED HELP ASAP !!!
Answer:
x=6
Step-by-step explanation:
To find x you need to equate X+4 and 3X-8 to give you X+4 = 3X-8 (you can do this as it is an isosceles triangle and both these sides are the same length). you then solve the equation for x which is the length of AC
Help me pls i need help
Answer: 32a^5b^3√b
Step-by-step explanation:
Simplify the radical by breaking the radicand up into a product of known factors assuming positive real numbers
a reflection in the x-axis followed by a reflection in the y-axis leaves a point in its original location. Is it always true, sometimes true or never true? Explain clearly.
It's always true that a reflection on the x-axis followed by a reflection on the y-axis leaves a point in its original location.
What is a coordinate axis?
A coordinate system in geometry is a system that uses one or more numbers, or coordinates, to determine the position of points or other geometric elements on a manifold such as Euclidean space.
When a reflection in the x-axis followed by a reflection in the y-axis leaves a point in its original location. Is it always true?
The answer is true.
Reason: For example, piece of graph paper into 4 pieces, draw this same thing on all four:
In this condition reflection in the x-axis followed by a reflection in the y-axis leaves a point in its original location of different color is yes.
Hence, it's always true that a reflection on the x-axis followed by a reflection on the y-axis leaves a point in its original location.
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A sample of 148 college students at a large university reports getting an average of 6.85 hours of sleep last night with a standard deviation of 2.12 hours.
a.Verify that it is reasonable to use the t-distribution to construct a confidence interval for the average amount of sleep students at this university got last night.
b. Construct a 98% confidence interval for the average amount of sleep students at this university got last night. Use two decimal places in your margin of error.
c.. Provide an interpretation of your interval in the context of this data situation.
d.. Suppose you want to conduct a similar study at your university. Assuming that the standard deviation of this sample is a reasonable estimate of the standard deviation of sleep time at your university, how many students do you need to survey to estimate the mean sleep time of students at your university with 95% confidence and a margin of error of 0.5 hours?
The solution for the questions is mathematically given as
a)
t-distribution.
b)
the confidence interval for the mean, based on 98 percent of the sample, is ( 6.3952, 7.3048 )
c) the value of the \(\mu_0\) is within the range of the 98 percent confidence interval for the mean, which is between 6.3952 and 7.3048, then accept H_0; otherwise, reject H _0.
d)
you should conduct a poll with around 123 students to determine the average amount of time that students spend sleeping at your institution.
What is the distribution to use?Generally, the equation for is mathematically given as
a.
In this case, the standard deviation of the population is unknown.
As a result, we make use of the t-distribution.
b)
We wish to generate a confidence interval with a 98 percent likelihood for the mean.
Because of this,
\((\bar{X}-t_{n-1,\alpha/2}\frac{s}{\sqrt{n}},\bar{X}+t_{n-1,\alpha/2}\frac{s}{\sqrt{n}})\)
\((6.85-t_{148-1,0.02/2}\frac{2.12}{\sqrt{148}},6.85+t_{148-1,0.02/2}\frac{2.12}{\sqrt{148}})\)
\((6.85-t_{147,0.01}\frac{2.12}{12.1655},6.85+t_{147,0.01}\frac{2.12}{12.1655})\)
(6.3952,7.3048)
Therefore, the confidence interval for the mean, based on 98 percent of the sample, is ( 6.3952 , 7.3048 )
c )
If the value of the mu _0 is within the range of the 98 percent confidence interval for the mean, which is between 6.3952 and 7.3048, then accept H_o; otherwise, reject H_0.
d . Here, we want to determine the sample size
Therefore,
\(n=t_{n-1,\alpha/2}^2\frac{s^2}{E^2}\)
\(n=t_{148-1,0.05/2}^2\frac{2.12^2}{0.5^2}\)
\(n=t_{147,0.025}^2\frac{2.12^2}{0.5^2}\)
\(n=2.6097^2\frac{2.12^2}{0.5^2}\)
n=122.4364
In conclusion, you should conduct a poll with around 123 students to determine the average amount of time that students spend sleeping at your institution.
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A 4-pack of coffee mugs costs $2.20. What is the unit price?
Answer:
The unit price for a coffee mug is $0.55.
Step-by-step explanation:
The unit price is simply just the price per unit.
We have a 4-pack of coffee mugs that costs $2.20.
He have 4 units and the price per 4 units.
Lets evaluate the price per 1 unit.
\(\frac{2.20}{4} =\frac{x}{1}\)
Lets solve for \(x\).
Divide \(x\) by 1.
\(x=\frac{2.20}{4}\)
Divide 2.20 by 4.
\(x=0.55\)
In the group of 2000 people 40 persent reads science and 30percent reads maths.If 100 people read both then how many people don't read both
Answer: 500 people don't read both.
Step-by-step explanation:
30% of 2,000 = 600 people read math.40% of 2,000 = 800 people read science.800 + 100 + 600 = 1,500 people either read science, math, or both.2,000 - 1,500 = 500 people don't read math and science.Which inequality represents the solution for the given inequality? n -7 > -11
Answer:
n > -4
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityStep-by-step explanation:
Step 1: Define
n - 7 > -11
Step 2: Solve for n
[Addition Property of Equality] Add 7 on both sides: n > -4Here we see that any value n greater than -4 would work as a solution.
10. Start with a situation in which there are three 10-year bonds with 0%, 4.00% and 9.00% coupons. The initial market interest rate is 8.22%. The par is $1,000. (a) Find the price of each bond. (6) Suppose the market interest rate now increases to 8.45%. For each bond, find the new price and percentage change in the price. What is the relationship among the bonds in terms of bond price sensitivity, i.e. interest rate risk? (c) Suppose the market interest rate now decreases to 8.05%. For each bond, find the new price, and percentage change in the price as compared to the initial prices found in (a).
Bond A: Price = $614.46, New Price = $595.50, Percentage change = -3.08%, New Price (market interest rate 8.05%) = $637.13, Percentage change (market interest rate 8.05%) = 3.69%.
Bond B: Price = $791.59, New Price = $762.05, Percentage change = -3.73%, New Price (market interest rate 8.05%) = $819.15, Percentage change (market interest rate 8.05%) = 3.48%.
Bond C: Price = $1019.55, New Price = $970.53, Percentage change = -4.81%, New Price (market interest rate 8.05%) = $1053.72, Percentage change (market interest rate 8.05%) = 3.35%. Relationship: Bond C > bond B > bond A.
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how can you represent 100 as an exponential expression with 10 as the base
Given:
The number of 100.
To find:
The given number as an exponential expression with 10 as the base.
Solution:
We have,
Given number = 100
It can be written as
\(100=10\times 10\)
\(100=10^{1+1}\) \([\because a^m\cdot a^n=a^{m+n}]\)
\(100=10^2\)
Here, base is 10 and exponent is 2.
Therefore, the given number can be written as \(10^2\).
If w and v represent integers, which linear equation shown below will pass through the origin?
Based on the function properties, the linear equation that will pass through the origin is w = 10v
Which linear equation will pass through the origin?From the question, we have the following parameters that can be used in our computation:
w and v are integers
As a general rule;
A linear equation that passes through the origin has the form y = mx
Where m is the slope
Using the variables w and v, we have
w = mv
Set m = 10 or any integer value
So, we have
w = 10v
Hence, the equation of the linear function is w = 10v
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You are mountain climbing with a friend. You need to reach a ledge that is 22 feet above you. You toss a grappling hook with a velocity of 32 feet per second. The equation that models the path of your hook is given by the function below:
h(t)=-16t^2+32t+5
a. Write the equation in vertex form. Describe the graph by identifying the vertex, axis of symmetry, and the direction of the opening.
b. What is the maximum height you have thrown the hook?
c. What is the result of this toss?
You decide to try again and increase the velocity of your toss to 34 feet per second.
d. What is the maximum height of this toss?
e. What is the result of this toss?
f. What are the x
and y
intercepts? Do they have meaning in the context of this problem? Explain.
g. What is the domain in this problem? What does it represent in the problem?
a. To write the equation in vertex form, we need to complete the square. The vertex form of a quadratic equation is given by:
h(t) = a(t - h)^2 + k
Expanding the equation:
h(t) = -16t^2 + 32t + 5
Completing the square:
h(t) = -16(t^2 - 2t) + 5
= -16(t^2 - 2t + 1) + 5 + 16
= -16(t - 1)^2 + 21
The vertex form of the equation is:
h(t) = -16(t - 1)^2 + 21
The vertex is (1, 21), the axis of symmetry is t = 1, and the opening is downward.
b. The maximum height can be determined from the vertex form of the equation. In this case, the maximum height is the y-coordinate of the vertex, which is 21 feet.
c. The result of this toss is that the grappling hook reaches a maximum height of 21 feet.
d. When the velocity is increased to 34 feet per second, the equation remains the same, and the maximum height can still be determined from the vertex form. The maximum height is still 21 feet.
e. The result of this toss is also that the grappling hook reaches a maximum height of 21 feet.
f. To find the x-intercepts, we set h(t) = 0 and solve for t. However, in this context, the x-intercepts do not have a meaningful interpretation because it represents the time at which the hook would hit the ground, which is not relevant to reaching the ledge.
The y-intercept is obtained by evaluating h(0), which gives us h(0) = 5. In this context, the y-intercept represents the initial height of the grappling hook.
g. The domain in this problem represents the possible values of time (t) that can be used in the equation. Since time cannot be negative, the domain is t ≥ 0. It represents the time elapsed since the toss was made.
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Hello
Can you help me to do these two exercises please I block on those please it is on the derivatives of a number
Thank you so much in advance!!!
Answer:
First rememeber that if we have a function like:
g(x) = x^n
then:
dg(x)/dx = g'(x) = n*x^(n - 1)
And also if we have:
g(x) = f(x) + h(x)
then:
dg(x)/dx = g'(x) = f'(x) + h'(x)
1) We have the function f(x) = (x + 1)^2
We can rewrite this as:
f(x) = x^2 + 2*x + 1
Using both things written above, we know that:
f'(x) = 2*x + 1*2 = 2*x + 2
And we want to find f'(-2), so we only need to evaluate the above function in x = -2, this is:
f'(-2) = 2*-2 + 2 = -4 + 2 = -2
f'(-2) = -2
b) I suppose that this refers to the inverse function of f(x)
An inverse function is such that:
g( f(x)) = x
f( g(x)) = x
For f(x) = (x + 1)^2
The inverse will be something that first cancels that square, and then subtracts 1.
Then:
g(x) = √x - 1
if we evaluate this in f(x) we get:
g( f(x)) = √(f(x)) - 1 = √(x + 1)^2 - 1 = (x + 1) - 1 = x
Then the inverse function of f(x) is:
g(x) = √x - 1
This can also be written as:
g(x) = x^(1/2) - 1
Then the derivative of this will be:
g'(x) = (1/2)*x^(1/2 - 1) = (1/2)*x^(-1/2) = (1/2)*(1/√x)
Researchers are concerned about the impact of students working while they are enrolled in classes, and they’d like to know if students work too much and therefore are spending less time on their classes than they should be. First, the researchers need to find out, on average, how many hours a week students are working. They know from previous studies that the standard deviation of this variable is about 5 hours.A survey of 200 students provides a sample mean of 7.10 hours worked. What is a 95% confidence interval based on this sample?
Answer:
The 95% confidence interval based on this sample is =
[6.41, 7.79]
Step-by-step explanation:
The formula for Confidence Interval =
Mean ± z × standard deviation/√n
Sample mean = 7.1 hours
Standard deviation = 5 hours
n = 200 students
z = 95% confidence interval z score
= 1.96
C.I = 7.1 ± 1.96 × 5/√200
C.I = 7.1 ± 0.693
Hence, Confidence Interval
= 7.1 - 0.693
= 6.407
Approximately = 6.41
= 7.1 + 0.693
= 7.793
Approximately = 7.79
Therefore, the 95% confidence interval based on this sample is
[6.41, 7.79]
Casey walked diagonally, from one corner to the opposite corner, across a square garden whose sides are 25 feet. How far did he walk?
Answer:
25m
Step-by-step explanation:
A square is a parallelogram having all sides equal. Hence, if Casey walked diagonally, she should have gone 25m as the rules of square states.
please mark brainliest
PLEASE HELP MEEE PLEASEEEE
9514 1404 393
Answer:
x³ +9x² +27x +27
Step-by-step explanation:
Put x where 'a' is, and put 3 where 'b' is in the given pattern, then simplify.
(x +3)³ = x³ +3x²(3) +3x(3²) +3³
= x³ +9x² +27x +27
Marta makes 90\%90%90, percent of the free throws she attempts. She is going to shoot 333 free throws. Assume that the results of free throws are independent from each other. Let xxx represent the number of free throws she makes.
Answer: 299
Step-by-step explanation: 333 X .9 = 299.7; Can't make .7 of a free throw.
what is the standard form of the equation? y=(x+2)^2-3
Answer:
Find the asymptotes.
Vertical Asymptotes:
x
=
−
2
Horizontal Asymptotes:
y
=
0
No Oblique Asymptotes
Which is the ordered pair for the point on the x-axis
that is on the line parallel to the given line and through
the given point (-6, 10)?
O (60)
0 (0,6)
O (-5, 0)
O (0,-5)
Answer:(6,0)
Step-by-step explanation:
Its the only positive point on the x axis
The ordered pair on the x axis that is one the line parallel to the given point P ( -6 , 10 ) is Q ( 6 , 0 )
What is an Equation of a line?The equation of a line is expressed as y = mx + b where m is the slope and b is the y-intercept
And y - y₁ = m ( x - x₁ )
y = y-coordinate of second point
y₁ = y-coordinate of point one
m = slope
x = x-coordinate of second point
x₁ = x-coordinate of point one
The slope m = ( y₂ - y₁ ) / ( x₂ - x₁ )
Given data ,
Let the equation of line be represented as A
Now , the value of A is
Let the first point be P ( -8 , 6 )
Let the second point be Q ( 4 , -4 )
Now , the slope of the line is m = ( y₂ - y₁ ) / ( x₂ - x₁ )
Substituting the values in the equation , we get
Slope m = ( -4 - 6 ) / ( 4 + 8 )
Slope m = -5/6
Now , the equation of line is y - y₁ = m ( x - x₁ )
y + 4 = ( -5/6 ) ( x - 4 )
Subtracting 4 on both sides , we get
y = -5 x/6 - 4/6
Now , the ordered pair be ( 6 , 0 )
5x + 6y + k=0, passes through ( -6 , 10 )
So , ( -30 + 60 + k = 0 )
k = -30
And , the line is 5x + 6y - 30 =0
So , the ordered pair ( 6 , 0) satisfies the condition of the equation
Hence , the ordered pair is ( 6 , 0 )
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The complete question is attached below :
Which is the ordered pair for the point on the x-axis that is on the line parallel to the given line and through the given point (-6, 10)?
O (60)
0 (0,6)
O (-5, 0)
O (0,-5)
Guys, I’m back from nearly a year later went on hiatus on The Brainly because of myself as an anxiety and a very stressful year with A.D.H.D., and I really need help from my own schoolwork from my own school about, “A Perimeter Of The Composite Figures” with only 2 more perimeter questions left to go as soon as possible before it’s too late, please! :O
Please read it as soon as possible before answering to 2 of my own perimeter questions and thank you guys. :)
There’s only 55 points for you to answer to my own 2 of my own perimeter questions, guys! :D
Well good luck, guys! :D
Answer:
2. 26.2 m
3. 117.2 cm
Step-by-step explanation:
You want the perimeters of two figures involving that are a composite of parts of circles and parts of rectangles.
2. Semicircular archThe circumference of a circle is given by ...
C = πd . . . . . where d is the diameter
The length of the semicircle of diameter 12.6 m will be ...
1/2C = 1/2(π)(12.6 m) = 6.3π m ≈ 19.8 m
The two lighted sides of the rectangle have a total length of ...
3.2 m + 3.2 m = 6.4 m
The length of the light string is the sum of these values:
19.8 m + 6.4 m = 26.2 m
The length of the string of lights is about 26.2 meters.
3. Fan shapeThe perimeter of the figure is the sum of four quarter-circles of radius 11.4 cm, and 4 straight edges of length 11.4 cm.
Four quarter-circles total one full circle in length, so we can use the formula for the circumference of a circle:
C = 2πr
C = 2π·(11.4 cm) = 22.8π cm ≈ 71.6 cm
The four straight sides total ...
4 × 11.4 cm = 45.6 cm
The perimeter of the figure is the sum of the lengths of the curved sides and the straight sides:
71.6 cm + 45.6 cm = 117.2 cm
The design has a perimeter of about 117.2 cm.
__
Additional comment
The bottom 12.6 m edge in the figure of problem 2 is part of the perimeter of the shape, but is not included in the length of the light string.
<95141404393>
use the ti-84 plus calculator to find the z-scores that bound the middle 96% of the area under the standard normal curve. enter the answers in ascending order and round to two decimal places.
The Ti-84 Plus calculator can be used to find the z-scores that bound the middle 96% of the area under the standard normal curve. The z-scores should be entered in ascending order and rounded to two decimal places.
To calculate the z-scores, we need to find the boundaries that enclose the middle 96% of the area under the standard normal curve. Since the standard normal curve has a total area of 1, the remaining 4% is divided equally into two tails, each containing 2%. To find the z-scores corresponding to these boundaries, we can use the inverse normal distribution function on the Ti-84 Plus calculator.
Using the inverse normal distribution function, we can find the z-score that corresponds to a cumulative probability of 0.02 (2% on one tail). This z-score represents the lower boundary. Similarly, we can find the z-score corresponding to a cumulative probability of 0.98 (2% on the other tail), which represents the upper boundary.
By entering these z-scores in ascending order and rounding them to two decimal places, we can determine the z-scores that bound the middle 96% of the area under the standard normal curve using the Ti-84 Plus calculator.
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Given matrix A=(
1
3
2
−2
). [i] Use the cross-multiplication method to calculate the determinant of matrix A, i.e. find ∣A∣. [ii] Find the inverse of matrix A, i.e. find A
−1
. Note:- You may use the short-cut method as discussed in Chapter 3. [b] Given matrix B=
⎝
⎛
3
3
2
1
0
0
−2
2
−1
⎠
⎞
. [i] Find the co-factor matrix of matrix B. [ii] Choose a suitable row or column to expand in order to find the determinant of matrix B and explain why. Calculate the determinant of matrix B, i.e. calculate ∣B∣ based on this choice. Note:- A mark will be deducted if your choice is not the proper choice. [iii] Use your results from parts [i] and [ii] to find the inverse of matrix B, i.e. find B
−1
.
[i] To calculate the determinant of matrix A using the cross-multiplication method, we can use the formula: ∣A∣ = (1 * -2) - (3 * 2) = -4 - 6 = -10. Therefore, the determinant of matrix A is -10.
[ii] To find the inverse of matrix A, we can use the formula: A^(-1) = (1/∣A∣) * adj(A), where adj(A) represents the adjugate of matrix A.
The adjugate of matrix A is obtained by swapping the elements along the main diagonal and changing their signs.
So, the adjugate of matrix A is:
( -2 2 )
( -3 1 )
Next, we can calculate A^(-1) by dividing the adjugate of A by its determinant:
A^(-1) = (1/∣A∣) * adj(A) = (1/-10) * ( -2 2 ) ( -3 1 ) = (1/-10) * ( -2/10 2/1 ( -3/10 1/10 ) = ( 1/5 -1/5 )( 3/10 -1/10 )
Therefore, the inverse of matrix A is:
( 1/5 -1/5 )
( 3/10 -1/10 )
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How much artificial turf should be purchased to cover an athletic field that is in the shape of a trapezoid with the height of 13m and base that measures 43m and 34m
ANSWER:
500.5 m²
STEP-BY-STEP EXPLANATION:
To know how much artificial grass should be purchased to cover the athletic field, we must calculate the area corresponding to the figure.
The area of a trapezoid has the following formula:
\(A=\frac{1}{2}(b+B)\cdot h\)Where b is the small base, B is the large base and h is the height, we substitute and calculate the area, like this:
\(\begin{gathered} A=\frac{1}{2}(34+43)\cdot13 \\ \\ A=\frac{1}{2}\cdot77\cdot13 \\ \\ A=500.5\text{ m}^2 \end{gathered}\)It is necessary to purchase the amount of 500.5 m² to be able to cover the athletic field
Find the generating function of the sequence {an}n≥0 determined by an = an−1 + 6an−1 with initial conditions a0 = 1, a1 = 3. You need to find the closed form of the generating function, but you don’t need find the closed form of the coefficients.
The generating function for the sequence {an} is given by a(x) = (1 + 2x) / (1 - x - 6x^2). It captures the terms of the sequence {an} as coefficients of the powers of x.
To find the generating function of the sequence {an}, we can use the properties of generating functions and solve the given recurrence relation.
The given recurrence relation is: an = an-1 + 6an-2
We are also given the initial conditions: a0 = 1 and a1 = 3.
To find the generating function, we define the generating function A(x) as:
a(x) = a0 + a1x + a2x² + a3x³ + ...
Multiplying the recurrence relation by x^n and summing over all values of n, we get:
∑(an × xⁿ) = ∑(an-1 × xⁿ) + 6∑(an-2 × xⁿ)
Now, let's express each summation in terms of the generating function a(x):
a(x) - a0 - a1x = x(A(x) - a0) + 6x²ᵃ⁽ˣ⁾
Simplifying and rearranging the terms, we have:
a(x)(1 - x - 6x²) = a0 + (a1 - a0)x
Using the given initial conditions, we have:
a(x)(1 - x - 6x²) = 1 + 2x
Now, we can solve for A(x) by dividing both sides by (1 - x - 6x^2²):
a(x) = (1 + 2x) / (1 - x - 6x²)
Therefore, the generating function for the given sequence is a(x) = (1 + 2x) / (1 - x - 6x²).
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The notebook costs £ 1.10, the pen is £ 33 and the pencil £ 25 buys (Remy) 4 pencils, one pen, two sharpeners and some paint.
what do you need to know? you should write the question
how many ways are there for eight men and five women to stand in a line so that no tow women stand right next to each other
In 609638400 ways eight men and five women can stand in a line so that no two women stand next to each other.
What is meant by Permutation?An arrangement of items in a specific order is referred to as a permutation. Here, the components of sets are organized in a linear or sequential manner. The permutation of the set A=1,6 is 2, for instance, 1,6, and 6,1. There is no alternative way to organize the components of set A, as you can see.
In contrast to combination, where the order of the parts is irrelevant, permutation calls for a specific arrangement of the elements in many ways.
We genuinely wonder how the timetables of trains, buses, and airlines are set up in accordance with the convenience of the general population. Of course, the permutation is quite useful in planning the departure and arrival timetables for these.
How to solve?
For 8 men in a line: 8! = 40320
In order to separate 2 women, we have to choose 5 out of 9
C(9,5) = 9! / 5!4! = 126
Random place 5 women in the 5 chosen places: 5! = 120
Total ways= 40320 * 126 * 120 = 609638400
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Find the slope of (4,-11) and (7,13)
m=13−−11/
7−4
m=24/
3
m = 8
your answer is 8 :)
if the confidence interval for the difference in population proportions Pi suggests which of the following? o The first population proportion is less than the second. o The two population proportions might be the same. o No comparison can be made between the two population proportions. o The first population proportion is greater than the second.
If the confidence interval for the difference in population proportions Pi suggests that the two population proportions might be the same. The correct answer is option (b).
A confidence interval is a range of values calculated from a given set of data or statistical model that has a high probability of containing an unknown population parameter, such as a population mean or proportion. The specified level of confidence refers to the percentage of possible intervals that can contain the true value of the population parameter.
Proportions are calculated by dividing the frequency of a particular outcome by the total number of outcomes. For example, if there are 20 heads and 80 tails in a series of coin tosses, the proportion of heads is 0.2 (20 divided by 100).
Population refers to a group of people, animals, plants, or objects that share a common characteristic or feature. It is the entire set of items or individuals that a researcher is interested in studying in order to make generalizations about a particular phenomenon.So, if the confidence interval for the difference in population proportions Pi suggests that the two population proportions might be the same.
This option: The two population proportions might be the same is the correct one.
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A park charges $16 for one round of miniature golf and a reduced fee for each additional round played. If Tom paid $51 for 6 rounds of miniature golf, what is the reduced fee for each additional round played?
1. Se dispara una bala de 10grbcon una velocidad de 500m/s contra un muro de 10cm de espesor. Si la resistencia del muro al avance de la bala es de 3000 N, calcula la velosidad calcula la velocidad de la bala después de atravesar el muro. 2. Un automóvil de 1000kg de masa aumenta su velosidad de 0 a 100 km/h en un tiempo mínimo de 8s calcula su potencia en watios y en caballos de vapor. Dato : 1cv = 735w. 3. Desde una altura de 10m deja caer un cuerpo de 5kg. Calcula su velocidad al llegar al suelo
Answer:
1) La velocidad de la bala después de atravesar el muro es de aproximadamente 435,890 metros por segundo.
2) La potencia del automóvil es 96438,272 watts o 131,208 caballos de vapor.
3) La velocidad del objeto al llegar al suelo es aproximadamente 14,005 metros por segundo.
Step-by-step explanation:
1) La velocidad final de la bala puede determinarse mediante el Teorema del Trabajo y la Energía, a partir del cual se tiene la siguiente fórmula:
\(\frac{1}{2}\cdot m\cdot v_{o}^{2} -F\cdot \Delta s = \frac{1}{2}\cdot m \cdot v_{f}^{2}\) (1)
Where:
\(m\) - Masa de la bala, en kilogramos.
\(v_{o}, v_{f}\) - Velocidades inicial y final de la bala, en metros por segundo.
\(F\) - Resistencia del muro al avance de la bala, en newtons.
\(\Delta s\) - Espesor del muro, en metros.
Si sabemos que \(m = 0,01\,kg\), \(v_{o} = 500\,\frac{m}{s}\), \(F = 3000\,N\) and \(\Delta s = 0,1\,m\), entonces la velocidad final de la bala es:
\(v_{f}^{2}=v_{o}^{2} -\frac{2\cdot F\cdot \Delta s}{m}\)
\(v_{f} = \sqrt{v_{o}^{2}-\frac{2\cdot F\cdot \Delta s}{m} }\)
\(v_{f} \approx 435,890\,\frac{m}{s}\)
La velocidad de la bala después de atravesar el muro es de aproximadamente 435,890 metros por segundo.
2) Asumamos que el automóvil acelera a tasa constante, significando que la fuerza neta será constante. Para un sistema cuya fuerza neta sea constante, la potencia experimentada queda descrita por la siguiente ecuación:
\(P = m\cdot a(t)\cdot v(t)\) (2)
\(a(t) = a\) (3)
\(v(t) = v_{o} + a\cdot t\) (4)
Donde:
\(P\) - Potencia, en watts.
\(m\) - Masa del automóvil, en kilogramos.
\(a(t)\) - Aceleración, en metros por segundo al cuadrado.
\(v(t)\) - Velocidad, en metros por segundo.
\(v_{o}\) - Velocidad inicial del automóvil, en metros por segundo.
Si sabemos que \(m = 1000\,kg\), \(a = 3,472\,\frac{m}{s}\), \(v_{o} = 0\,\frac{m}{s}\) y \(t = 8\,s\) entonces la potencia experimentada por el automóvil es:
\(P = 96438,272\,W\) (\(131,208\,C.V.\))
La potencia del automóvil es 96438,272 watts o 131,208 caballos de vapor.
3) El cuerpo experimenta un Movimiento de Caída Libre, el cual es un Movimiento Uniformemente Acelerado debido a la gravedad terrestre. La velocidad del cuerpo al llegar al suelo se determina mediante la siguiente fórmula cinemática:
\(v_{f} = \sqrt{v_{o}^{2}+2\cdot g\cdot h}\) (5)
Donde:
\(v_{o}\) - Velocidad inicial del cuerpo, en metros por segundo.
\(v_{f}\) - Velocidad final del cuerpo, en metros por segundo.
\(g\) - Aceleración gravitacional, en metros por segundo al cuadrado.
\(h\) - Altura recorrida por el cuerpo, en metros.
Si sabemos que \(v_{o} = 0\,\frac{m}{s}\), \(g = 9,807\,\frac{m}{s^{2}}\) y \(h = 10\,m\), entonces la velocidad al llegar al suelo es:
\(v_{f} \approx 14,005\,\frac{m}{s}\)
La velocidad del objeto al llegar al suelo es aproximadamente 14,005 metros por segundo.