# Posts by CLara

Total # Posts: 134

**Physics**

A young girl with mass 39.5 kg is sliding on a horizontal, frictionless surface with an initial momentum that is due east and that has magnitude 85.5 kg?m/s . Starting at 0 s , a net force with magnitude F=( 8.35 N/s )t and direction due west is applied to the girl. A) At what...

**physics**

Calculate the mass of brass if the heat to rise it's temperature of 10k is 38000j and it's specific heat capacity Of water is 380j/kg

**physics**

A ballet student with her arms and a leg extended spins with an initial rotational speed of 1.2 rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg?m2 and her rotational velocity is 3.9 rev/s .Determine her initial rotational inertia.

**physics**

An extremely dense neutron star with mass equal to that of the Sun has a radius of about 10 km ?about the size of Manhattan Island. These stars are thought to rotate once about their axis every 0.03 to 4 s, depending on their size and mass. Suppose that the neutron star ...

**phyics**

A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The rotational inertia of the propeller is approximately 3.0 kg?m2. Kinetic...

**physics **

A 10-kg disk-shaped flywheel of radius 9.0 cm rotates with a rotational speed of 320 rad/s. Determine the rotational momentum of the flywheel. With what magnitude rotational speed must a 10-kg solid sphere of 9.0 cm radius rotate to have the same rotational momentum as the ...

**physics **

A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m If the star initially rotates at the same rate as our Sun, ...

**ap physics**

A Verdant Power water turbine (a "windmill" in water) turns in the East River near New York City. Its propeller is 2.5 m in radius and spins at 32 rpm when in water that is moving at 2.0 m/s. The rotational inertia of the propeller is approximately 3.0 kg?m2....

**ap physics**

Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.8×10?3kg?m2 .

**ap physics**

Suppose that Superman wants to stop Earth so it does not rotate. He exerts a force on Earth F? SonE at Earth's equator tangent to its surface for a time interval of 1 year. The mass of Earth is 5.98×1024kg, the radius is 6.37×106m. Assume that Earth is a solid ...

**ap physics**

A 10-kg disk-shaped flywheel of radius 9.0 cm rotates with a rotational speed of 320 rad/s. Determine the rotational momentum of the flywheel. With what magnitude rotational speed must a 10-kg solid sphere of 9.0 cm radius rotate to have the same rotational momentum as the ...

**ap physics**

A star the size of our Sun runs out of nuclear fuel and, without losing mass, collapses to a white dwarf star the size of our Earth. The radius of our Sun is 6.96×108m , the radius of Earth is 6.37×106m . If the star initially rotates at the same rate as our Sun, ...

**ap physics**

Suppose that a person closes a car door. The person's fingers are in the door opening, that is located 0.50 m from the hinges. The rotational inertia of the car door is 5.0 kg?m2. The door closes in 0.1 s and the rotational speed of the door is 1.4 rad/s just before it ...

**ap physics**

A car leaves an intersection after a light turns green. It starts from rest and reaches a speed of 13.4 m/s in 5.0 s. The radius of a tire of the car is 0.25 mDetermine the average rotational acceleration of the tire.

**ap physics**

what is the rotational acceleration?

**ap physics**

A car leaves an intersection after a light turns green. It starts from rest and reaches a speed of 13.4 m/s in 5.0 s. The radius of a tire of the car is 0.25 m.

**English Riddle**

Air

**Math**

Julie scored 50 points in a game. How many points did Leonora score if she scored p points less than Julie in terms of p?

**Algebra pt. 2**

Relating back to my question below I think I have it.. I multiplied the coordinates by 2 and got.. V 12 4 W -4 8 X -6 -4 Y 6 -10 Here is my question of the previous post.. The coordinates of quadrilateral VWXY Are given below. Find the coordinates of its image after a dilation...

**Algebra**

Ok.. so I'd do 12 x 2, 4 x 2 or 12 + 4 x 2?

**Algebra**

The coordinates of quadrilateral VXY Are given below. Find the coordinates of its image after a dilation with the given scale factor V(6, 2), W(-2, 4), X(-3, -2), Y(3, -5) scale factor of 2 Do I just multiply the coordinates by each other?? V(12 x 4) W(-4 x 8) X(-6 x -4) Y(6 x...

**math**

It is the answer as 4-8= -4-(-2)=-4+2=-2, 17-(-2)=19

**math**

Start with the integer 4. Subtract 8. From your answer subtract -2, and the subtract 17 from the last answer. What is your final answer?

**math**

Start with the integer 4. Subtract 8. From your answer subtract -2, and then subtract 17 from the last answer. What is your final answer?

**Physics**

The size of Rutherford's atom is about 0.1 nm. (a) Calculate the attractive electrostatic force between an electron and a proton at that distance. (b) Calculate the electrostatic potential energy of that atom. Express the result in unit eV. (c) The size of Rutherford's...

**Physics**

What is the wavelength of light that can cause a transition of an electron in the hydrogen atom from the orbit with n = 6 to n = 8?(answer in µm)

**English**

I don't want to guess for you but I'm assuming that they should all make sense and mean the same? Maybe u can try substituting "I" for a name like John or something and then see if the sentences make sense? Hope this helps :)

**Math**

The Fiedler family has up to $130,000 to invest. They decide that they want to have at least $40,000 invested in stable bonds yielding 5.5% and that no more than $60,000 should be invested in more volatile bonds yielding 11%. How much should they invest in each type of bond to...

**U.S. History**

I think you are correct. Im not a tutor though.

**Math**

total paid = 35 * number of months 700 = 35 * n so n = 700/35 Therefore, 20 months

**Math**

An artist is creating a mosaic that cannot be larger than the space allotted which is 4 feet tall and 6 feet wide. The mosaic must be at least 3 feet tall and 5 feet wide. The tiles in the mosaic have words written on them and the artist wants the words to all be horizontal in...

**Science**

consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?

**global warming**

srry

**global warming**

i have heard*

**global warming**

why do you have to shout i have people talk that global warming exist

**global warming**

What is the Cause of global warming

**Chemisty**

Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers Need help A.S.A.P

**Biology**

How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular to the membrane to accumulate ...

**Biology**

Sorry I meant I'm not sure if cross-flow and perpendicular flow are the same thing.

**Biology**

Hi, one more question to clarify: How can the mass transfer kc and ultrafiltration solvent flux be increased? Select one: a. Another stream of fluid can flow adjacent to the membrane to accumulate solute at the membrane surface b. Another stream of fluid can flow perpendicular...

**Biology**

What is the osmotic pressure of the salt solution in reverse-osmosis? Select one: a. An equilibrium state where the amount of solvent passing in opposite directions is equal b. An equilibrium state where the amount of solvent passing in one direction is greater than other ...

**algebra**

The manager of the school cafeteria is planning a plate lunch. She can spend no more than $2.00 per lunch and can choose servings from selections A and B. The table indicates the cost and the quantity of sugar and protein (in grams) per serving of each food choice. Food Cost ...

**Art**

I know your not really Jacksepticeye...

**Physics**

A 1800 kg mass car is traveling south at a velocity of 15 m/s through an intersection. It is hit by a 3500 kg mass car traveling east at 20 m/s. If the two cars collide and become one object (perfectly inelastic). What will be the final displacement of the cars after the ...

**Physics**

A 5 gram bullet is fired into a 7 kg ballistic pendulum suspended vertically from the ceiling. If the bullet embeds into the block and the two move as one to a new final height of 12 cm. What was the initial velocity of the bullet before impacting the pendulum?

**maths**

Given the demand function:p(x)=-0.5x+500 where p is price in RM per unit and x is the quantity demanded and the marginal costfunction C'(x) = -0.5-480, and the fixed cost =RM 900, find a) the level of production that will maximise profit b) the maximum profit c) the price ...

**algebra**

what is the error and the correction in finding the difference? 3/4 - 9/2 = 3-9 (4-2) = -6 / 2 = -3

**Algebra 2**

Solving By Factoring 4x(x-6)-x(x-2)=-24 Please show work!!!

**Algebra 2**

Solving By Factoring 6x^2-13x=-6 (x-8)(x-5)=x 4x(x-6)-x(x-2)=-24 Please show work I want to learn!!!!!!

**algebra**

n a survey of 60 randomly-chosen employees, 15 said they would prefer an hour for lunch with no breaks each day. 45 employees said they would prefer thirty minutes for lunch with two other breaks each day. If there are 500 people employeed by the company, predict the number ...

**algebra2**

Scores on a test are normally distributed with a mean of 75 and a standard deviation of 8. Estimate the probability that a randomly selected student scored between 71 and 75.

**algebra**

The table below gives the value of a car over two years. Using an exponential best-fit model, after how many years is the car valued at 25% of the original value? Year 0 0.5 1.0 1.5 2.0 Value ($) 15,500.00 14,560.00 13,911.20 12,969.66 12,204.09

**Physics**

A 2.0 kg ball moving with a speed of 3.0 m/s hits, elastically, an identical stationary ball as shown. If the first ball moves away with angle 30° to the original path, determine a)the speed of the first ball after the collision. b)the speed and direction of the second ...

**Intro to computer**

B. An image file featuring the Windows 8 operating system

**Chemistry**

In the reaction C(s) + 2S(s) ¨ CS2(l), the change of enthalpy (ƒ¢H) is 89.3 kJ. Calculate the amount of heat absorbed when 6.33 g of carbon disulfide is formed.

**Chemistry**

How many kilojoules of heat are absorbed when 1.2 L of water is heated from 24oC to 86oC?

**physics**

this is a physics qustion im stuck on: ingrid holds the womans record time for a marathon race of 2h 21min 6s for 42.195km. The mens record is held by Blake grison of 2h 6 min 50s. If they had been in the same race how much would blake win by.. find this in time as well as ...

**math**

A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the number of copies ordered and C(x) be ...

**math**

Help please >.< The Hotel Lakewell has 450 rooms. Currently the hotel is filled . The daily rental is $ 750 per room. For every $ 4 increase in rent the demand for rooms decreases by 7 rooms. Let x = the number of $ 4 increases that can be made. - What should x be so as ...

**math**

how to change 25 in a mixed number

**Chemistry**

Co-ordination number of Cr in dibenzene chromium is ??

**CHEMISTRY HELP PLEASE!!!**

The cell potential of the following electrochemical cell depends on the pH of the solution in the anode half-cell: Pt(s)|H2(g,1atm)|H+(aq,?M)||Cu^2+(aq,1.0M)|Cu(s) what is the pH of the solution if Ecell is 375 mV? I first got .65 as my pH, but it said that it was wrong. ...

**Math**

If it takes 4 minutes to fill a bucket with one tap and 6 minutes to fill the bucket with another tap. Using both taps how many seconds will it take to fill the bucket?

**math**

I don,t know

**Math**

#4: Correct B.

**Math on time**

So we know that Paige spends an equal amount of time on each subject. We also know that she studies Spanish for a half hour or 30 minutes. So what the question is really asking you is how many increments of 30 minutes are in a hour or 60 minutes. So what's 30/60?

**Penn Foster**

Its A! I love PF!

**Algebra**

Find the number of decibels for the power of the sound. Round to nearest decibels. A rock concert, 5.21 x 10^-6watts/cm^2 D= dB

**math**

a seismoraph 300km from the epicenter of an earthquake recorded a maximum amplitude of 5.4 x 10^2um. Find this earthquakes magnitude on the Richter Scale. (Round your answer to the nearest tenth). M=

**algebra**

1/3log(x)-log(10000)=4

**social studies**

Because/Even though children’s understanding of AIDS increases with age: A. AIDS education should not be attempted before adolescence. B. relatively young children can still grasp complex scientific concepts about disease. C. children in grades K-6 cannot even give a ...

**social studies**

Fran's little girl, Fifi, is a real tomboy. Fran asks you to explain why Fifi prefers rough play, boys' clothing and toys, and the company of boys to the company of girls. You believe in the biological explanation of gender development, so you will tell Fran that it is...

**social studies**

The answer is C

**social studies**

Jasper, who already had 6 cookies, has just taken the last cookie from the jar after Mother told him, "No more cookies!" You saw Jasper take the cookie. You ask him how he feels about what he has just done. Jasper says that he likes cookies. You ask him how his ...

**social studies**

I read it over my notes again, and it is B.

**social studies**

I do, and I meant to say C.

**social studies**

Pookie is listening to music through headphones so that no one else can hear it. When Pookie's sister walks into the room, he says, "Sissy, do you like this song?" even though she cannot hear the music. Pookie's question indicates that he engages in which ...

**social studies**

Treasure claims that her 6-month-old baby, Precious, can add and subtract small numbers of objects. Recent research on infants' understanding of numbers would: A. indicate that Treasure is nuts. B. prove that Precious can add and subtract up to 20 objects. C. support ...

**social studies**

Results of Renee Baillargeon's sliding carrot research may suggest that object permanence: A. may not be present until much later than Piaget believed. B. may be present at a much younger age than Piaget thought. C. cannot be tested with violation-of-expectations methods. ...

**social studies**

Barbara's due date was over 2 weeks ago. Dr. Sally told Barbara that her baby is postmature, so she wants to induce labor. What is probably Dr. Sally's greatest concern regarding the health of Barbara's baby? A. The baby might be brain damaged. B. Barbara might be ...

**social studies**

Which one of the following babies is at greatest risk for SIDS? A. Alfred, who is 5 months old and had a difficult birth B. Mary, who is 2 weeks old and has irregular sleep patterns and an overweight mother C. John, who is 3 months old and has a teenage mother who smokes D. ...

**social studies**

Mary Lou must complete a research project to get her associate degree. She has just one year left to finish her degree and must spend as little time and money as possible on her research. She plans to compare stress levels of 8th graders to stress levels of 9th graders. What ...

**social studies**

The esteemed Dr. Bookworm has just completed a study in which he found a +1.0 correlation between the number of cups of coffee his students drank right before class and the scores they earned on his final exam. This correlation means that: A. the less coffee the students drank...

**social studies**

The right to __________ is not one of the ethical guidelines for research specified by the APA. A. financial compensation B. informed consent C. privacy and confidentiality D. avoidance of deception I cannot find the answer to this question.

**social studies**

Four-year-old Sergei can tell his Poppa how to wash the clothes. Yesterday, Sergei told Poppa, "First, get the dirty clothes from the basket. Next, put them in the washing machine. Now, add some soapy stuff. Close the washer lid and press the button. When the buzzer rings...

**social studies**

Four-year-old Sergei can tell his Poppa how to wash the clothes. Yesterday, Sergei told Poppa, "First, get the dirty clothes from the basket. Next, put them in the washing machine. Now, add some soapy stuff. Close the washer lid and press the button. When the buzzer rings...

**social studies**

An Li reached puberty at age 12, and John Smith retired at age 65. An Li's and John Smith's experiences are examples of: A. normative events. B. non-normative influences. C. critical periods. D. risk factors. I chose A. but now reading a little more into it, I'm ...

**social studies**

How many years can you expect to spend in retirement? A. 6 to 10 years B. 10 to 12 years C. 12 to 16 years D. from 16 to 25 years Is the answer C?

**social studies**

The people who are in the best position to save are: A. teenagers. B. young adults in their 20s. C. middle-aged. D. elderly I'm between C and D. Please help!

**business**

The average management fee for all mutual funds is: A. less than 0.25%. B. 0.25% to 0.50%. C. 0.50 to 1.25%. D. 1.25 to 2.50%. The answer I found is C, but I don't know if it is right.

**business**

I don't either, but I have to pick one. Which one do you think would be the best answer?

**business**

If creditors give you no credit for payments made during the billing period, this is called the: A. APR method. B. discount method. C. previous balance method. D. adjusted balance method. My choice is A, but Im a little confused.

**business**

If you think that your bill is wrong, you should first: A. contact the local credit bureau and inform it of the billing error. B. complain to the Better Business Bureau. C. contact your state consumer protection agency. D. notify the creditor in writing within 60 days after ...

**business**

Debt-to-equity ratio is: A. calculated by dividing total liabilities by net worth. B. calculated by dividing monthly debt payments by net monthly income. C. determined by dividing your assets by liabilities. D. rarely used by creditors in determining credit worthiness. My ...

**business**

An account at a commercial bank designed for people who want to earn a higher savings rate is a(n) __________ account. A. regular savings account B. regular checking C. share draft D. money market account My answer is D. Am I right?

**business**

I meant to say C.

**business**

Most people pay federal income tax by: A. paying the total amount owed by April 15. B. filing quarterly tax payments. C. having amounts withheld from income. D. earning tax credits for various deductions. I chose d. But I am not sure

**phycology**

Money management refers to: A. preparing personal financial statements. B. day-to-day financial activities. C. storing financial records for easy access. D. spending money on current living expenses.

**math**

Please show steps and give me explanations! Thank you. 1. If x=1/2, what is the value of 1/x+1/x-1 ? The answer is 0. 2. The sequence ZWYX may be changed in either two ways. Either two adjacent letters may be interchanged or the entire sequence may be reversed. What is the ...