Rob

This page lists questions and answers that were posted by visitors named Rob.

Questions

The following questions were asked by visitors named Rob.

What is the exact value of sin 5ð and how do you find it? type in the google search engine.. sin(5degrees) It will compute it for you. It appears you pasted something that the ASCII didn't translate. You'll need to type out the value for the angle.

What is cos (pi/2 - x) secx using the fundamental identities to simplify the expression. I think I have the right answer but I want to check to make sure. Well, cos (pi/2 - x) is something you should've seen already. It's just another name for sin(x). Als...

An agency charges $15 per person for a trip for groups of no less than 30 people. But for each person above the 30, the charge (for everyone!) will be reduced by $0.15. Write a revenue function for the agency usin x as number of people above 30. What size...

Can this be factored: 6/5x^1/5 - 12/5x^-4/5 I am trying to find the values for X which will make this equal to zero. My factoring looks like this but not sure it is right 6/5x^1/5(1-2x^-1) so I get X= 0 and X=2

I asked this before and did not get a response so I am trying again. (Note, I didn't know how to type the symbol for pi) What is the derivative of: 2pi^2r^4 would it simply be 8pi^2r^3? I was thinking the 2pi^2 is simply the equivalent of a constant in fr...

For a smal change in x, dx: ds² = dx² + dy² ds = sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy²)] s = INTEGRAL of sqrt [(dx² + dy² * dx²/dx²)] s = INTEGRAL of sqrt[(1 + dy² * 1/dx²)] dx s = INTEGRAL of sqrt[(1 + (dy/dx)²)] dx

Calculate the Go for the oxidation of 5 moles of tin in the following balanced reaction. 16HCl + 2KMnO4 + 5Sn ---> 5SnCl2 + 2MnCl2 + 2KCl + 8H2O

Manganese dioxide reacts with bromide ions to form manganese ions and bromate ions in an acidic aqueous solution. Write the balanced equation for this reaction. 1)Br- + MnO2 + 3H2O --> Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ ---> 3Mn2+ + 9H2O + BrO3- 3...

Which laser beam carries more energy per photon? red, yellow, green, violet? I think red. Am I right?

In the photoelectric effect, what determines the kinetic energy of the ejected electrons?

In the photoelectric effect, what determines the number of ejected electrons?

An electron and a proton are traveling at the same speed. Which one has the longer wavelength?

Who was the scientist that invented the uncertainty principle ? Was it Heisenberg?

How many grams of NaOH are present in 5.0 mL of a 1.0% (m/v) NaOH solution?

Which process would release energy from gold, fission or fusion? Which would release energy from carbon? From iron?

Mixing copper and zinc atoms produces the alloy brass. What would be produced with the fusion of copper and zinc nuclei?

If a pair of carbon atoms were fused, and the product were to emit a beta particle, what element would be produced?

Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.

List at least two major potential asvantages of power production by fusion rather than by fission.

For a period of time as an alligator grows, its mass is proportional to the cube of its length. When the alligator's length changes by 15.8%, its mass increases by 17.3kg. Find its mass at the end of this process.

Given f(x)=2x^3-7 find f^-1(x) and then find f^-1(-2) I though that this meant inverse function. x=2y^3-7 x+7=2y^3 (x+7)/2=y^3 ((x+7)/2)^(1/3)=y so this meant f^-1(-2) = 1.35721 The professor posted the answer as being 6. I'm not sure if I misunderstood t...

If f is decreasing and f(20)=10, which of the following must be incorrect? Explain. a. (f^-1)'(20)=-3 b. (f^-1)'(10)=12 how do i work this problem? i'm kind of confused about inverse functions.

Find the tangent line approximation to 1/x when x=1 How do i find tangent line approximations??? my prof hasn't gone over this and i don't understand how to do it.

cos2x(2cosx+1)=0 x=?

hi i was wondering how would you find the equation of a parabola with it's vertex at -2,0, and with no directrix or focus given. the parobala opens toward the left. the two choices in my multiple choice answer sheet that sound the most logical would be x+...

A result of welfare economics is that the equilibrium price of a product is considered to be the best price because it a. maximizes total revenue for firms and maximizes the quantity supplied of the product. b. maximizes the combined welfare of buyers and...

In which of the following circumstances would a buyer be indifferent about buying a good? a. The amount of consumer surplus the buyer would experience as a result of buying the good is zero. b. The price of the good is equal to the buyer's willingness to...

How do I do radical 7/10... my answer was 4 radical 3 over 6... is that correct?

Are the following sentences punctuated correctly? The lung exam showed no rales, rhonchi or wheezes. She has a history of cough, not productive, that keeps her awake at night. The patient is a well-developed, well-nourished, badly sunburned cantankerous w...

Are the following sentences punctuated correctly? Although, there is no definite evidence of malignancy, a biopsy should still be performed. He is incidentally, allergic to contrast material. Surgery, is not in my opinion indicated at this time.

The sides of a square each measures 4 ¾ inches. Find the area of the square as a fraction or mix number. (Do not use decimals)

Here is the source code for the Kitty class: public class Kitty { String name; int age; public Kitty(){ } public void setName(String n){ name = n; } public String getName(){ return name; } public void setAge(int a){ age = a; } public int getAge(){ return...

csquared + 10c + 25 factor the expression...

factor the expression csquared + 10c + 25

Do these look right? What shape does an ammonia (NH3) molecule have?trigonal pyramidal In a tetrahedral molecule, how many unshared pairs of valence electrons does the central atom have? none In a polar bond, electrons are? completely transferred What det...

A pole with a height of 60 ft. has a shadow of length of 34.64 ft at a particular instant of time. Find the angle of elevation of the sun at this point of time.

A particle moves along a straight line with equation of motion s = f(t), where s is measured in meters and t in seconds. Find the velocity and speed when t = 9. f(t) = t ^-1 - t

Using the operations push(E obj), peek(), pop(), empty() give a Java implementation of the method // Reverses the elements in the stack //and returns the result. // The stack passed as an argument to //reverse() will be // destroyed upon return. public st...

A water tank has a volume of 100m^3. A square pipe leading to a pump is designed to completely replace all water in 20 minutes. Caluclate the length of a side of the square if the water is travelling at 5.0m/s through the square pipe.

what is the molarity of a 50% by mass solution of NaOH id the density of the solution is 1.05 g/ml

Hello, I'm wondering what the difference is in method when it comes to finding the pH of a weak acid versus finding the pH of a strong acid? Thanks!

B is the midpoint of Symbol for segment AC. AB=3x-6 BC=2x+2 What is the value of AB? Show your work for credit.

Why does the reaction of (Z)-butenedioic acid (fumaric acid) with 1,3-cyclopentadiene give only one product? I don't know where to start. Thanks.

Given Circle D, if AC = 16 units, then what is the length of CB? A circle is drawn with center D. Two radii are drawn, AD and DC. Segment AC is drawn with a perpendicular, DB.

in the sentence "He felt hungry and thought about the lunch wrapped in his handkerchief." which are the linking verbs and which are the action verbs?

Communist Prison Camp In such prisons the total regimen, consisting of physical privation, prolonged interrogation total isolation from former relationships and sources of information, detailed regimentation of all daily activities, and deliberate humilia...

what is the concentration of an aqueous solution when you add 9.58x10^-4 moles of copper nitrate to 42ml of water

If Rupert flew 3/16 of the way around the world but George only flew 4/9 as far as Rupert, how far around the world did George fly?

Latoya has 3/4 of a bag of popcorn. If she eats half of the popcorn at a movie, ho much does she have left?

When heated, N2O4 dissociates as follows: N2O4 =2NO2 A flask initially contians .560 M N2O4. at this temperature, Kc is 4.00. what is the equilibrium concentration of NO2?

What expression represents the same value as sin 19(degrees)?

a small child is sliding down a 25 degree slide at a uniform velocity of 1.0 m/s. If the child weighs 210 N, find the coefficient of friction between the slide and the child.

If the sides perpendicular to the wall have length x feet, which of the following (A, B, C, or D) represents the area A of the garden? A(x) = –2x2 + 30x A(x) = –2x2 + 60x A(x) = x2 – 60x A(x) = 2x2 – 60x

Pharmaceutical drugs have an inelastic demand, and computers have an elastic demand. Suppose that technological advance doubles the supply of both products (that is, the quantity supplied at each price is twice what it was).

Pharmaceutical drugs have an inelastic demand, and computers have an elastic demand. Suppose that technological advance doubles the supply of both products (that is, the quantity supplied at each price is twice what it was). a. What happens to the equilib...

factor completely 3y^3 - 12y

what is tangential velocity of the earth as it travels in its orbit around the sun?

on a planet whose mass is twice that of earth and whose radius is same, with what acceleration will a body fall at sea level?

baseball thrown horizontally takes 1.1 seconds to reach the ground. What is the height at which the ball was thrown?

If a hot dog vendor offers 18 different condiments; how many condiment combinations are there?

Part 1) Exposure to dust at work can lead to lung disease later in life. In a study of 115 drill and blast workers involved in tunnel construction the mean dust exposure was 18.0 mg-yr/m^3 with a standard deviation of 7.8 mg-yr/m^3 (sample 1). Another stu...

Part 1) A physical therapists wishes to determine whether an exercise program increases flexibility. He measures the flexibility (in inches) of 12 randomly selected subjects both before and after an intensive eight-week training program and obtains the fo...

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights o...

a plane flies due north at 300 mi/h for 3 h then due west at 250 mi/h. If x represents the number of hours the plane is flying due west, determine for what values of x the plane will be more than 3700 mi from it's original point.

An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?

You are driving your race car around a circular test track. Which would have a greater effect on the magnitude of your acceleration, doubling your speed or moving to a track with half the radius? Why?

You have a tiny slip of paper and a large rectangular wooden block. If you put both of them side-by-side and drop the two to the floor from the same height, the block gets to the floor first. Can you think of (and describe) three “simple” ways (using noth...

Tom Brady passes a football – at a velocity of 50 ft/s at an angle of 40 degrees to the horizontal – toward an intended receiver 30 yd straight downfield. The pass is released 5 ft above the ground. Assume that the receiver is stationary, is isolated and...

In the Kite Runner, why is the story about the sultans included? What is that story about?

List advantages of the Bay of Fundy power plant

Express as a single term in simplest form: 5/2- radical 12

a car exerts tractive force, calculate the force available for acceleration

If earths mass were reduced by 1/2 , but its radious satyed the same , how much would your weight change ? Would it also be reduced by half ?

10 to the 9-9 power = ? How do you come to the answer =1?

A factory makes automobile parts, 5C7, 1O6 or 3Z0, which are of 5,000 parts, what is the minimum number of parts with the same serial number?

How much energy is associated with a photon in the gamma ray region of the spectrum with a frequency of 6.6*10^5s^-1

One gram of water changes from liquid to solid at a constant pressure of one atmosphere and a constant temperature of 0°C. In the process, the volume changes from 0.90 cm3 to 1.10 cm3. The work done by the water is .02J, but I'm not sure how to find the i...

prove that 5x - 7 - sin3x = 0 has at least one zero and prove that it has exactly one real zero. How am I supposed to show my work for this? I don't really understand how to show my work for the IVT. Without that I can't do any work for the MVT.

I need to do an essay but need to know if it is usually blank percent rainy or blank persent sunny usually in Port Saint Lucie? Can you help or give me a website that gives me percentages on how it usually is.

find the LCM of y^2+6y+9 and y^2+y-6

find the LCM of 11(z-3)and 33(z-3)

A 25kg crate is sitting at the bottom of an inclined plane. The inclined plane 12m long meets the horizontal at an angle of 15 degrees and has a coefficient of friction of 0.55. A force is applied to the crate so as to slide the crate up the incline at a...

A box which has a mass of 14kg is sliding along a horizontal surface with a velocity of 18m/s when it encounters a frictionless inclined plane which meets the horizontal at an angle of 28 degrees. The box slides up the incline until it comes to a halt. Ho...

A mass of 2.2kg is placed on a stiff vertical spring which has a spring constant of 950n/m. The object is then pressed against the spring until it has been compressed a distance of 77cm. The mass is then released and is allowed to be thrown up into the ai...

In this problem, your task is to analyze a lead balloon. The balloon in question is a hollow sphere of diameter of 20.0 m, constructed from a lead foil 0.25 mm thick and filled with helium gas. Below the balloon, a passenger basket is suspended. The mass...

I can not get he correct answer -10. -3/3{a+c(b+5)-(-6+a)} a=1, b=-6, c=-4

container factory uses a 450 W motor to operate a conveyor belt that lifts containers from one floor to another. To lift 250 1-kg containers a vertical distance of 2.4 m, the motor runs for 45 s. What is the efficiency of the motorized conveyor system?

A 16-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 35 N. Starting from rest, the sled attains a speed of 2.1 m/s in 9.5 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.

A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box...

Use the data given below to construct a Born - Haber cycle to determine the electron affinity of Br? DH°(kJ) K(s) → K(g) 89 K(g) → K⁺(g) + e⁻ 419 Br2(l) → 2 Br(g) 193 K(s) + 1/2 Br2(g) → KBr (s) -394 KBr(s) → K⁺(g) + Br⁻(g) 674 I know the answer is -325 k...

I have this question which I believe I solved correctly, but I was wondering if someone could look it over to make sure? The question is... Assay for Vitamin A (a fat soluble vitamin) required an extraction step into ether. In this assay, 2.00 mL of serum...

Evaluate e^0.1 to four decimal places

i am having trouble with this compound. Molybdenum (VI) Chromate I'm have it find its formula and can't seem to get it. Thanks for the help.

What are the reducing agent and the oxidising agents in the synthesis of ammonia from hydrogen and nitrogen?

Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round t...

Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n=500, x=350, 90% confidence ?<p<? (Round to three decimal places as needed.)

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0.06; confidence level 90% ^p and ^q unknown n= (round up to the nearest integer)

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: five percentage points; confidence level 90% from a prior study, ^p is estimated by the decimal equivalent 56% n= (Round up to...

A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a...

What is the proof of theorem 2.23, where (b/a)+(d/c)=[(bc)+(ad)]/(ac). Thank you :)

Answers

The following answers were posted by visitors named Rob.

1)Br- + MnO2 + 3H2O Mn2+ + BrO3- + 2H3O+ 2)Br- + 3MnO2 + 6H3O+ 3Mn2+ + 9H2O + BrO3- 3)6Br- + MnO2 + 48H2O Mn2+ + 32H3O+ + 6BrO3- 4)4Br- + 3MnO2 + 18H2O 3Mn2+ + 12H3O+ + 4BrO3- 5)Br- + 3MnO2 + 3H3O+ 3Mn2+ + BrO3- + 3H2O I got the first one. Is that right?

jugo de naranja? vas al supermarche

in 1920 the republicans did something they hadn't done in a very long time. What was it?

Each number adds a digit: Example 6,38,932,1087,12437,123456,1234567,12345678,123456789, ect... The pattern is not the number itself, but how many numbers in each... Good Luck!

Sixty-five hundredTHs is 0.65 (0.065 would be sixty-five thousandths).

[H30+] = 10^-(pH goes here) A log is an exponent. Since pH is a negative log, it's an exponent with a negative sign on it (with an implied base of 10).

what is the formula or how did you get that answer?

that explains it better thanks Reiny

I need to invest on that calculator thanks Kerri

from the FBDs wouldnt u get for M: Fy = N-WM=Ma Fx=T=Ma for m: Fy= T-Wm=ma Fx= T-W=ma then solve for a in M of Fx and sub a into m of Fx to get T?

Sorry i see the mistake I made for m the acceleration would be negative since its moving down

i don't know..i just need help.

@Malogis I agree 100% :P

1/2 P(intitial)

Given: They collected 49 + 72 + 108 + 121 = 350 lbs of cans. So, the KNOWN part of the question is, “These folks collected 350 lbs of cans.” Answer: 10 I say the answer, 10, is really, “10 cents per pound.” Therefore, the UNKNOWN part of the question is,...

KE=1/2mXv KE=1/2(5kgX10m/s^2) KE=1/2(5kgX100m/s^2) KE=1/2(500kgXm/s^2) KE=250kgXm/s^2=250J

Copper (II) fluoride contains 37.42% F by mass. Use this percentage to calculate the mass of fluorine in grams contained in 24.0 g of copper (II) fluoride.

because they are opssite forces acting on eachother

What is R and T stand for?

6/14 Or 3/7 <--- Simplified

I got 2.67 m/s from your equation. But the correct answer is supposed to be 3.6 m/s.

Also, for part C, do I do KE final minus KE initial? So 1/2(5.06)(75^2) - 1/2(0.06)(225^2) ?

10x - 35 = 33 - 18x -12 28x = 56 x = 2

put paper on block

You're right. My mistake! Thank you...

The above answer in incorrect. Eventhough there was monopolies which were created by the govt. through loans, as all monopolies are created, thiis time period was an excellent one for the u.s.a Trists developed through innovation using the bessemer procce...

Try this way: Perimeter = 2x+2 therefore P = 2x + 2/x^2 d(perimeter)/dx = (2x^3-4)/x^3 solving for x = 2^(1/3) therefor y was given as y = x^-2 plug x into y to solve for y. y = 2^(-2/3) or y = (1/4)^(1/3) check the answer it should be 3.78

@Mia, for someone who is a story teller, you sure do know how to "spell" hahaha!

Well you see Bob, first you would use the commutative property and change it to some thing like this: (7.8* 800) *10 to the 12th= (7.8*80,000) *10 to the 10th.

It is the also 1/0.747 or 1.376

If a man runs for an hour and a half at 8 miles an hour Due south and then he continues south on a bus traveling 55 miles an hour for 24 minutes how far did you travel

.4 The probability of two independent events occurring in succession is the product of the two events' independent probabilities. .22 = that product. Because we know the probability of the first being red and the second not being red (.33), we know the pr...

I wish i could help, i just know we both gon get rekt in phys140 together

Would it be possible to give me a more step by step? Im lost

Oh, thank you. The 5∫3 just mean the upper and lower limts, I didn't know how else to write it

Thanks. Would that just be answer, or would I need to multiply the integral by 2?

Oh wait, shouldnt the limits be [0,-1] not [0,1]? Also is the answer then pi/2?

The employers portion of the payroll taxes

The answer is D. The volume of the rectangle = 180 x 1/3 x 1/3 x 1/3 = 180/27=6 + 18/27. Unit cube = 1 x 1 x 1

9. .27/.03=27/3. You can multiply the numerator and denominator by 100 to absolve decimals.

V=area of base x height. area of base = pi R^2. 1 ml = 1 cm^3. convert all numbers to same units and divide through to get H. 1,408,000,000 / (3.14x400x400)=2802.5 cm = 28.03 M.

that is difficult

Hallee's answers are right for OCA.

1. D 2. B 3. D 4. C For OCA students.

1. D 2. D 3. C 4. D Answers for OCA students

1. B / C 2. D 3. C 4. D Answers for OCA

I got CAABA, too. Answers might be different for others.

Yep, just did the test, it's B.

a) If the person is female, then there would be a 3 in 7 chance they can speak french. b) If the person can speak french, then there would be a 3 in 5 chance they are female. Hope this helps.

Well, what's the other temperature? You need two numbers to compare them. If the temperature is 2 degrees less than the other, then it would be: 70° F>68° F Using 70 as the first number.

@Ms. Sue How is she being disrespectful? She's just asking. @Reed She is not giving the answer, that is what she thinks. Also, you just gave her the answer anyway, so it really doesn't matter. @Kate @lisa Based on Reed's answer, it's arpeggio.

A) 30 m B) 64 m C) 49 m<-- This one. D) 72 m

B A B A Are right.

@Teacher Snitcher This doesn't really help anyone. What do you think the teachers are going to do, anyway? Scold us? I took the test, these were right. 1) C 2) B 3) C 4) A 5) C 6) A 7) B 8) D 9) B 10) A

1. A 2. B 3. C 4. A For the quick check.

Lilli is right.

C D C just took the quick check

\/(._.)\/s answers are right

just did quiz and bu yah is correct

The Housatonic originates in the Berkshire mountains in western Massachusetts. The city of Pittsfield, Massachusetts is where the East Branch, West Branch and Southwest Branches combine into a single "mainstem" river. By base level, you mean lowest level?...

Anon, Insertname, and Failing are all right, I just took the quiz.

Steve, You are right that A will never reach (0,0,1000). It was a typo, I meant to say (0,100,1000). But the question is not to find out how fast B needs to go. Ive already said its going the exact same speed as A. 20m/sec. Im trying to find out what shou...

@Behind you. Not what she meant. She was asking what the right answers are, because Lol said they were wrong.

These are all things you can google. You won't get help here.

Bro. The answer is obviously 6

I know this is several years late but thanks for the answer! It helped a lot.

I did it and found Ei = 7500N then i solved in Ef = mv^2/2 + mgh and solved for h, which gave me 7500N - 7.5v^2/1.47 then i solved everything but it gives me 0, idk what im doing wrong

I meant top 5x oops

18-A is correct

correct answer 1 B. should never be used 2. B. block organization

1. Choose the letter of the one sentence in which quotations and italics are correctly used. a. The Art News article A Pioneer in Many Fields announced the death of the multitalented Gordon Parks at age 93. b. The "Art News" article A Pioneer in Many Fiel...

6.39*10^23 source: my dreams

Wanna eat chicken

United States 1776

Also Find the horizontal distance to the point of impact from the point of release. Find the speed with which the rock strikes the river.

Thanks but unfortunately the automated reply , amazing though it is has missed the target. It would seem that it failed to comprehend the tangent part of the question. I have no idea how to calculate this myself but was expecting the answer to be several...

Many thanks Rob