A 1200 kg car travels at a constant speed of 15 m/s in a circular loop with a diameter of 45 m. What is the coefficient of friction on the car?
(a)
KE = m v^2 / 2 = (1200 kg)(20 m/s)^2 / 2 = 240,000 J
(b)
The energy is entirely dissipated by the force of friction in the brake system.
(c)
W = delta KE = KEf - KEi = (0 - 240,000) J = -240,000 J
(d)
Fd = delta KE
F = (delta KE) / d = (-240,000 J) / (50 m) = -4800 N
The magnitude of the friction force is 4800 N.
mark brainliest if correct
PLEASE HELP!!
Eight U.S. coins are worth a total of 38 cents. How many of the coins are dimes?
Take off 3 of the pennies and the 5 that remain would be 3 nickels and 2 dimes
2 dimes=20 cents
3 nickels = 15 cents
3 pennies=3 cents
Or these 8 coins = 38 cents
The tables shows the amount of sugar and the amount of water used in the fall. How many cups of sugar would be needed for 15 cups of water in the Fall Mixture?
Answer:
30
Step-by-step explanation:
it's x2 for the rest and 15x2 =30
On average, Americans have lived in 4 places by the time they are 18 years old. Is this average a different number for college students? The 50 randomly selected college students who answered the survey question had lived in an average of 3.79 places by the time they were 18 years old. The standard deviation for the survey group was 1.2. What can be concluded at the α = 0.10 level of significance?
Answer:
The decision rule is
Fail to reject the null hypothesis
The conclusion is
There is no sufficient evidence to conclude that the average is a different number for college students
Step-by-step explanation:
From the question we are told that
The sample size is n = 50
The population mean is [tex]\mu = 4[/tex]
The sample mean is [tex]\= x = 3.79[/tex]
The standard deviation is [tex]\sigma = 1.2[/tex]
The level of significance is [tex]\alpha = 0.10[/tex]
The null hypothesis is [tex]H_o : \mu = 4[/tex]
The alternative hypothesis is [tex]H_a : \mu \ne 4[/tex]
Generally the test statistics is mathematically represented as
[tex]z = \frac{ \= x - \mu }{ \frac{ \sigma }{ \sqrt{n}} }[/tex]
=> [tex]z = \frac{ 3.79 - 4 }{ \frac{1.2}{ \sqrt{50}} }[/tex]
=> [tex]z = -1.237[/tex]
From the z table the area under the normal curve to the left corresponding to -1.237 is
[tex]P(Z < -1.237) = 0.10804[/tex]
Generally the p-value is mathematically represented as
[tex]p-value = P(Z < -1.237) = 2 * 0.10804[/tex]
=> [tex]p-value = 0.21608[/tex]
Generally from the values obtained we see that
[tex]p-value > \alpha[/tex]
Hence
The decision rule is
Fail to reject the null hypothesis
The conclusion is
There is no sufficient evidence to conclude that the average is a different number for college students
A car can travel 400 miles on 16 gallons of gasoline. How much gasoline will it need to go 275 miles?
*HELP WILL GIVE BRAINLIEST!!!*
Answer:
11 miles.
Step-by-step explanation:
[tex]\frac{16 gallons}{400 miles} =\frac{x}{275 m}[/tex]
So x is the number of miles. This is a ratio problem, so if we had a situation like 1:2, when 1 changes 2 will accordingly change. 2:4. And 1:2 = 2:4.
So now to solve the equation. Cross multiply 16 and 275 = 4400. Cross multiply 400 and x. You'll end up with an equation like 400x = 4400. Then solve and you'll get x = 11. Hope this helps!
a philanthropist deposits 2,000$, in a trust fund that pays 6.0%interest , compunded continuously. The balance given to the college from which the has earned interest for 20 years. How much will the college receive? round to the nearest tenth
Answer:
$6414
Step-by-step explanation:
Step one
given
Principal=$2,000
rate= 6%= 0.06
Time= 20 years
Required
The final amount.
Step two:
The compound interest formula is
A= P(1+r)^t
substituting we have
[tex]A=2000(1+0.06)^2^0\\\\ A= 2000(1.06)^2^0\\\\ A=2000*3.207\\\\A=6414[/tex]
The amount given to the college is $6414
Examine the figure below. Determine which of the following angel measures are correct . Select all that apply
Answer:
bhnnjn
Step-by-step explanation:
1) 2 + 24 + 40 + 39- (33 - 30)
=
Answer:
102
Step-by-step explanation:
hope this helps
Answer:
2+24+40+39-(33-30)
105-33+30
135-33
132
Which starements are true about points A, B, and C? check all that apply.
Answer:
2
Step-by-step explanation:
2 seems to be the only one that is correct
Correct Statements: (modified the statements that are incorrect)
1. The coordinates of point A are (-3, 3)
2. Already correct
3. The coordinates of point C are (-2, -2)
4. Point B is the closest to the y-axis (only one away)
5. Point A is 3 away and Point B is 1 away
(sorry if this is confusing but this is what I got)
Help please giving brainliest!!
Answer:
Step-by-step explanation:
-1 = -3x + 5
add 3x on both sides
3x - 1 = 5
add 1 on both sides
3x = 6
divide both sides by 3 to get x by itself
x = 2
Find f(-3) of the function below
F(x)=2x^3-9x^2-5x
Answer:
your answer is -120
Step-By-Step Explanation:
2(-3)^3 - 9(-3)^2 -5(-3)
2 (-27) - 9(9) +15
-54 -81 +15
-135 +15
-120
i hope this helps :)
Answer: -120
Hope this helps :)
Saba's dance class is 3 miles from her home. Her music class is 12 miles from her
home. Write an equation that shows the number of times farther Saba's music
class is from her home than her dance class is from her home.
Answer:
The number of times Saba's further is 4, because 12/3 = 4
Step-by-step explanation:
express 25 as a power with base 5
Answer: 5
Step-by-step explanation:
Answer:
5^2 or 5 to the power of 2
Step-by-step explanation:
5x5=25
Please help!! i’ll mark you as brainliest!!
Answer:
For Triangle 1
a. Hypothenus = 4
b. Adjacent = 2√3
For Triangle 2:
a. Hypothenus = 2√2
b. Adjacent = 2
Step-by-step explanation:
For Triangle 1
NOTE: We shall be using angle 30°.
a. Determination of the Hypothenus.
Opposite = 2
Angle (θ) = 30°
Hypothenus =?
Sine θ = Opposite /Hypothenus
Sine 30 = 2 / Hypo
0.5 = 2 / Hypo
Cross multiply
0.5 × Hypo = 2
Divide both side by 0.5
Hypo = 2 / 0.5
Hypothenus = 4
b. Determination of the Adjacent
NOTE: We shall be using angle 30°.
Opposite = 2
Angle (θ) = 30°
Adjacent =?
Tan θ = Opposite / Adjacent
Tan 30 = 2 / Adj
1 / √3 = 2 / Adj
Cross multiply
1 × Adj = 2 × √3
Adjacent = 2√3
For Triangle 2:
a. Determination of the Hypothenus.
Opposite = 2
Angle (θ) = 45°
Hypothenus =?
Sine θ = Opposite /Hypothenus
Sine 45 = 2 / Hypo
1 / √2 = 2 / Hypo
Cross multiply
1 × Hypo = 2 × √2
Hypothenus = 2√2
b. Determination of the Adjacent
Opposite = 2
Angle (θ) = 45°
Adjacent =?
Tan θ = Opposite / Adjacent
Tan 45 = 2 / Adj
1 = 2 / Adj
Cross multiply
1 × Adj = 2
Adjacent = 2
An employee works 22 days
per month. If they work an
average of 8 1/4 hours per
day, how many hours do they
work per month?
8.25 x 22 = 181.5
181.5 divided by 60 = 3.025
each month, they would work about 3 hours
The graph of f^ prime is shown. Find and sketch the graph of f given that fis continuous and f(0) = 1 .
(#72 in the pic)
9514 1404 393
Answer:
see attached (blue line)
Step-by-step explanation:
The slope in the first interval (0 to 2) will be -1, down from the y-intercept of 1.
The slope in the second interval will be 2. After that, the slope is zero, so the graph is a horizontal line.
The blue line in the attached is the graph of f(x).
A group of researchers wants to know whether men are more likely than women to contract a novel coronavirus. They surveyed two random samples of 390 men and 360 women who were tested and found that 47 men and 52 women in the samples tested positive. Can you conclude that the proportion of positive tests among men is different from the proportion of positive tests among women? Use level of significance 10%. Procedure: Two means T (pooled) Hypothesis Test Step 1. Hypotheses Set-Up: H 0 : Select an answer = , where Select an answer the Select an answer and the units are Select an answer H a : Select an answer ? , and the test is Select an answer Step 2. The significance level α = % Step 3. Compute the value of the test statistic: Select an answer = (Round the answer to 3 decimal places) Step 4. Testing Procedure: (Round the answers to 3 decimal places) CVA PVA Provide the critical value(s) for the Rejection Region: Compute the P-value of the test statistic: left CV is and right CV is P-value is Step 5. Decision: CVA PVA Is the test statistic in the rejection region? Is the P-value less than the significance level? ? ? Conclusion: Select an answer Step 6. Interpretation: At 10% significance level we Select an answer have sufficient evidence to reject the null hypothesis in favor of the alternative hypothesis.
Answer:
Test statistic Z= 0.13008 < 1.96 at 0.10 level of significance
null hypothesis is accepted
There is no difference proportion of positive tests among men is different from the proportion of positive tests among women
Step-by-step explanation:
Step(I):-
Given surveyed two random samples of 390 men and 360 women who were tested
first sample proportion
[tex]p_{1} = \frac{360}{390} = 0.9230[/tex]
second sample proportion
[tex]p_{2} = \frac{47}{52} = 0.9038[/tex]
Step(ii):-
Null hypothesis : H₀ : There is no difference proportion of positive tests among men is different from the proportion of positive tests among women
Alternative Hypothesis:-
There is difference between proportion of positive tests among men is different from the proportion of positive tests among women
[tex]Z = \frac{p_{1}- p_{2} }{\sqrt{PQ(\frac{1}{n_{1} }+\frac{1}{n_{2} } } }[/tex]
where
[tex]P = \frac{n_{1}p_{1} +n_{2} p_{2} }{n_{1}+n_{2} }[/tex]
P = 0.920
[tex]Z= \frac{0.9230-0.9038}{\sqrt{0.920 X0.08(\frac{1}{390}+\frac{1}{52} } )}[/tex]
Test statistic Z = 0.13008
Level of significance = 0.10
The critical value Z₀.₁₀ = 1.645
Test statistic Z=0.13008 < 1.645 at 0.1 level of significance
Null hypothesis is accepted
There is no difference proportion of positive tests among men is different from the proportion of positive tests among women
Describe how to find the inverse of the function.
To find the inverse of the function, change f(x) to y, switch and y, and solve for . The resulting function can be written as , where .
1st box: x
2nd box: y
3rd box: 3
4th box: 0
What is the volume V of the sphere. Write the answer in terms of pie.
Plz help
Answer:
Volume=972π units cubed.
Step-by-step explanation:
The formula for the volume of a sphere is:
V=4/3πr^3
where r=radius
and v=volume
so we know the radius of the sphere in the diagram is 9 cm
so r=9 cm
we can subsitute this into the formula and solve.
V=4/3π(9^3)
V=4/3π*729
V=972π units cubed.
Which of the following correctly describes the end behavior of the polynomial
function, f(x) = -3x4 +2x2 - x?
HELPPPPPP ASAAP
Answer:
A. Both ends go down.
General Formulas and Concepts:
Algebra II
End behavior - what the y-values are approaching as x approaches negative infinity or infinityStep-by-step explanation:
If we graph the function, we can see that when x goes to -∞, y also goes to -∞.
We also see that when x goes to ∞, y still goes to -∞.
Therefore, both ends of the graph would head towards -∞, making A. the correct answer choice.
Answer:Both ends go down
Step-by-step explanation:
Isabella baked 10 cookies with 2 scoops of flour. How many scoops of flour does Isabella need in order to bake 45 cookies? Assume the relationship is directly proportional
Answer:
9 scoops
Step-by-step explanation:
If 10 cookies took 2 scoops of flour, then 4 scoops would make 20 cookies, 6 scoops would make 30, 8 scoops would make 40. If you need 5 cookies, then split 2 scoops in half, which would be one scoop. 8 scoops(which is 40 cookies)+ 1 scoop(5 cookies) = 9 scoops (45 cookies)
Shaun estimated that the attendance at a college game was 1,200 people. The actual attendance was 1,158. What is the percent error of Shaun's estimate? (Round your answer to the nearest tenth)
Answer:
3.6%
Step-by-step explanation:
The formula for percent error is [ |va-ve/ve| * 100% ].
1200-1158/1158 * 100%
42/1158 * 100%
0.036 * 100%
3.6%
Best of Luck!
The percentage error should be 3.6%
Given that,
Shaun estimated that the attendance at a college game was 1,200 people. The actual attendance was 1,158.Based on the above information, the calculation is as follows:
[tex]= (1200-1158)\div 1158 \times 100\%\\\\= 42\div 1158 \times 100\%\\\\= 0.036 \times 100\%\\\\[/tex]
= 3.6%
learn more; https://brainly.com/question/1691136?referrer=searchResults
Angie divides the polynomial function f(x)=x3+3x2−7x−21 by (x + 3). What can she conclude from the fact that the remainder is equal to 0?
Answer:
See below
Step-by-step explanation:
Given function
f(x)=x³ + 3x²- 7x - 21We can find its factors:
x³ + 3x² - 7x - 21 =x²(x + 3) - 7(x + 3) =(x² - 7)(x + 3)We can conclude that the given polynomial function is fully divisible by (x + 3) and the quotient is (x² - 7)
Also one of zeros of the function is -3
TRIGNOMETRY TEST DUE AT 10:02 PLZ HELP ME I DONT WANT TO FAIL THIS ONE!!! PLEASE SOMEONE MATH EASY HELP 123 ADDING SUBTRACTING
Answer:
7. 33 degrees
8. 17 degrees
9. 41 degrees
10. 75 degrees
This is all i can do I'd have to look up how to do 11-13
I hope this helps a little
Step-by-step explanation:
tor. Factor each expression. 2x + 8
Answer:
The factorized form of 2x + 8 is 2(x+4).
Step-by-step explanation:
Given the expression
2x + 8Let us factorize the expression
2x + 8
Rewrite 8 as 2·4
[tex]2x\:+\:8=2x+2\cdot \:\:4[/tex]
Factor out common term 2
= 2(x+4)
Therefore, factorized form of 2x + 8 is 2(x+4).
Rosie receives a weekly salary of $350 and a 6% commission on all sales.
a.) write a function f (d) that model the weekly earnings in terms of d dollars in sales.
b.) Find Rosie's earnings for a week with $670 total sales.
Answer:
a) F(d)=350+0.06d
b)$390.2
Step-by-step explanation:
350+0.06(670)=390.2
What is an equation for the parabola with focus (0, -12) and directrix y = 12
Given:
Focus of a parabola is (0, -12) and directrix is y = 12.
To find:
The equation of the parabola.
Solution:
General form of a parabola is
[tex](x-h)^2=4p(y-k)[/tex] ...(i)
where, (h,k) is vertex, (h,k+p) is focus and y=k-p is directrix.
Focus is (0, -12).
[tex](h,k+p)=(0,-12)[/tex]
[tex]h=0[/tex]
[tex]k+p=-12[/tex] ...(ii)
Directrix is y = 12.
[tex]k-p=12[/tex] ...(iii)
Adding (ii) and (iii), we get
[tex]2k=0[/tex]
[tex]k=0[/tex]
Putting k=0 in (ii), we get
[tex]0+p=-12[/tex]
[tex]p=-12[/tex]
Putting h=0, k=0 and p=-12 in (i).
[tex](x-0)^2=4(-12)(y-0)[/tex]
[tex]x^2=-48y[/tex]
[tex]-\dfrac{1}{48}x^2=y[/tex]
Therefore, the required equation of parabola is [tex]y=-\dfrac{1}{48}x^2[/tex].
Need help on number 2 plz I appreciate it thank you so much
Answer:
[tex] \angle PQR [/tex], [tex] \angle SQR [/tex], and [tex] \angle PQS [/tex]
Or
angle PQR, angle SQR and angle PQS
Step-by-step explanation:
The three different angles in the diagram are angle PQR, angle SQR and angle PQS.
Another way of writing this is using an angle sign before the alphabets follows. Thus:
[tex] \angle PQR [/tex], [tex] \angle SQR [/tex], and [tex] \angle PQS [/tex]
A fruit juice company includes 1.872 ounces of orange juice in a 6.65-ounce bottle of a mixed fruit
juice. How much of the bottle of mixed fruit juice is NOT orange juice?
ounces
(Type a whole number or a decimal.)
Answer:
4.778 ounces
Step-by-step explanation:
Given that:
Ounces of orange juice in mixed fruit juice = 1.872
Ounces of mixed fruit juice = 6.65 ounces
Ounces of Mixed fruit juice that is not orange juice :
(Ounces of mixed fruit juice - Ounces of orange juice)
(6.65 - 1.872) ounces
= 4.778 ounces
Do subtraction with monetory values.
$49.68 -$7.89=?
Answer:
U have $41.79 left i hope it is helpful have a nice day and merry Christmas
if you have $49.68 to spend and buy a $7.89 gingerbread set, you'll have 1 amazing gingerbread house.