Wednesday

December 7, 2016
Total # Posts: 1,062

**Physics Classical Mechanics**

MIT x Problem cheater

*November 27, 2013*

**physics**

5 sec

*November 18, 2013*

**Physics Classical Mechanics**

this is an MIT EDX problem cheater

*November 14, 2013*

**Computer**

Suppose that you are the general manager for a major-league baseball team. During the off-season, you need to sign some free-agent players for your team. The team owner has given you a budget of $X to spend on free agents. You are allowed to spend less than $X altogether, but ...

*November 11, 2013*

**Physics (angular motion)**

The blades of a fan running at low speed turn at 230rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 370rpm in 5.80s . Part A What is the magnitude of the angular acceleration of the blades? Part B How many revolutions do the blades go ...

*November 7, 2013*

**7th grade Math**

use n to stand for the number of payments and a for the amount still owed. write an equation for calculating a for any value of n

*October 29, 2013*

**Algebra**

1000(h) = 917(20+h) solve for h :/

*October 13, 2013*

**geomerty**

what form of symmetry does a equilateral triangle and a round button have?

*October 11, 2013*

**Physics**

If the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h? I tried using FB=FG but I don't get anywhere. Can anyone help me out?

*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...

*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...

*October 11, 2013*

**Physics**

But do I have to include He density in this equation at all?

*October 11, 2013*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N?

*October 11, 2013*

**Physics/Electricity**

An aluminum wire carrying a current of 9.0 A has a cross-sectional area of 7.0X10^-6 m2. Find the drift speed of the electrons in the wire. The density of aluminum is 2.7 g/cm3. (Assume three electrons are supplied by each atom.)

*October 6, 2013*

**Math**

Would that be 50/100?

*October 5, 2013*

**Math**

if the visible part of an ice berg is 50mx50m in area and 20m is above the surface, what is the height, h, below the surface? I have absolutely no idea where to even start.

*October 5, 2013*

**Physics**

A metal sphere is found floating in a pool. The sphere is 1m in diameter. If it is half submerged determine the weight of the sphere. You may assume the following: g=10N/kg density of Water = 1000kg/m^3 Vsphere = 4/3pir^3 I get 13.3 as my final answer, but there is no answer ...

*October 5, 2013*

**Psychology**

Aren't the variables the same though?

*October 2, 2013*

**Psychology**

So, the type of life skill program is the independent variable of this scenario? Can you please explain more as to why? The dependent variable is assessing the effectiveness of the new life skills program in promoting problem solving skills.

*October 2, 2013*

**Psychology**

Continuing... Group A gets the life skills training for 2 days. Group B meet at the same time and they plan their own activities. Group C takes part in the prison program. At the end of 12 weeks, all three groups are assessed on their ability to solve personal and ...

*October 2, 2013*

**Psychology**

What is the independent variable in this scenario: A research Psychologist is working in a federal prison and is asked to asses this new program. From 70 inmate volunteers, the psychologist randomly assigns 45 inmate volunteers to three groups: group A, group B, and group C.

*October 2, 2013*

**Geometry**

A cylindrical hockey puck is 1in high and 3in in diameter. What is its volume in cubic inches?

*September 30, 2013*

**Geometry**

Find the area of a regular pentagon with radius 5in.

*September 30, 2013*

**Geometry**

The length of each side of a rhombus is 16. The longer diagonal has length 26. Find the measures of the angles of the rhombus to the nearset degree.

*September 30, 2013*

**Geometry**

The altitude to the hypotenuse of a right triangle ABC divides the hypotenuse into 12mm and 16mm segments. Find the lengths of each of the following. A. The altitude to the hypotenuse B. The shorter leg of angle ABC C. The longer leg of angle ABC

*September 30, 2013*

**Geometry**

Find the area of each equilateral triangle. The triangle has 12cm sides. The triangle has 10in altitudes.

*September 30, 2013*

**Geometry**

The circumference of the ball of string is 415ft and it weighs 13,0000Ib. Which is the best approximation of the volume of the ball of string? F.300FT^3 G.600FT^3 H.1200FT^3 I.2400FT^3

*September 30, 2013*

**Geometry**

The circumference of the ball of string is 415ft and it weighs 13,0000Ib. what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75

*September 30, 2013*

**Geometry**

Find the missing length. MG=10cm, NP=4cm, QP= 14cm, MN=____cm

*September 29, 2013*

**Geometry**

The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?

*September 29, 2013*

**Geometry**

A lawn chair weighs 8Ib. A child's lawn chair has dimensions exactly one half those of the larger chair. How many pounds does the child's chair weigh?

*September 29, 2013*

**Geometry**

The slan heights of two similar pyramids are in the ratio 1:5. The volume of the smaller pyramid is 60m^3. What is the volume in cubic meters of the larger pyramid?

*September 29, 2013*

**Geometry**

Two similar pyramids have laterl area 8ft^2 and 18ft^2. The volume of the smaller pyramid is 32ft^3. Find the volume of the larger pyramid.

*September 29, 2013*

**Geometry**

A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and weight.

*September 29, 2013*

**Geometry**

Which is the best approximation of the volume of the ball of string? A. 300ft^3 B. 600ft^3 C. 1,200ft^3 D. 2,400ft^3

*September 29, 2013*

**Geometry**

what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75

*September 29, 2013*

**Geometry**

find the radius of a sphere withh the given property. A.The number of square meters of a surface area equals the number of cubic meters of volume. B. The ratio of surface area in square meters to volume in cubic meters is 1:5.

*September 29, 2013*

**Geometry**

The density of steel is about 0.28Ib/in^3. could you lift a solid steel ball with radius 4in? whith radius 6in? explain

*September 29, 2013*

**Geometry**

Give the dimensions of a cylinder and a sphere that have the same volume.

*September 27, 2013*

**Geometry**

On September 3, 1970 a hailstone with diameter 5.6in fell at Coffeyville, Kansas. It weighed about 0.018Ib/in^3 compared to the normal 0.033Ib/in^3 for ice. About how heavy was this Kansas hailstone?

*September 27, 2013*

**Geometry**

tell whether each of the following points is inside, outside, or on the sphere. A(o, -3,4)B(-1,-1)C(4,-6,-10).

*September 27, 2013*

**Geometry**

use pie(3.14) to estimate the surface area and volume of a sphere with radius 3cm.

*September 27, 2013*

**Geometry**

A 5 foot tall woman stands 15ft from a statue. She must look up at an angle of 60 degrees to see the top of the statue. How tall is the statue?

*September 25, 2013*

**Geometry**

find the area of a hexagon with radius 6.2m.

*September 24, 2013*

**Geometry**

find the area of a regular pentagon with radius 5in

*September 24, 2013*

**Geometry**

find the volume of a triangular prisim with a=2.3, c=2 and h=1.5

*September 24, 2013*

**Geometry**

what shape does a semi circle form when rotated?

*September 24, 2013*

**Geometry**

what shape does a square form when rotated?

*September 24, 2013*

**Geometry**

what is the volume of a cylinder with a radius of 1.2 and height of 5.3cm

*September 24, 2013*

**Geometry**

A plane flying 16 degrees west of north at 289mph is flying in air which is moving 32mph at due west. Find the resulting speed and direction of the plane. (Step by step please!)

*September 24, 2013*

**Geometry**

A regular hexagon with radius 6.2m.

*September 24, 2013*

**Geometry**

A regular pentagon with radius 5inches.

*September 24, 2013*

**Geometry**

Explain why sinx degrees= cos(90-x)degrees. include a diagram with your explanation.

*September 24, 2013*

**physics**

2.05 m/s2

*September 23, 2013*

**Geometry**

A surveyor measuring the tallest tree in a park is 100ft from the tree. His angle-measuring device is 5 ft above the ground. The angle of elevation to the top of the tree is 48°. How tall is the tree?

*September 20, 2013*

**Geometry**

A family vacationed at a beach 120 mi east and 30 mi south of their home. Find the distance and the direction from their home to the beach.

*September 20, 2013*

**Geometry**

Twenty minutes after being launched, a hot-air balloon has risen to an altitude of 300 m. The pilot can still see the starting point on the ground at a 25° angle of depression. How many meters is the balloon from the starting point?

*September 20, 2013*

**Geometry**

A 5 foot tall woman stands 15 ft from a statue. She must look up at an angle of 60° to see the top of the statue. How tall is the statue?

*September 20, 2013*

**Language and Other Barriers**

Thanks guys

*September 20, 2013*

**Language and Other Barriers**

9. To be a teacher aide in an ESL classroom, you should A. have an ear for language. B. receive certification in ESL instruction, if possible. C. speak at least one other language besides English. D. have prior teacher aide experience in a â€œregularâ&#...

*September 20, 2013*

**Chemistry**

I was asked this question for homework but I don't even know where to begin. It has 3 parts to answer. 1) add all lone pairs and make multiple bonds with the framework shown to satisfy the octets and make the best Lewis structure. 2) For the C-N bond(s) in each molecule ...

*September 14, 2013*

**chemisrty **

565 g block of aluminum metal is cooled from 243 c to 100 c is what?

*September 14, 2013*

**Chemistry**

I am also having issues for this structure as well. [CH*subscript3*CH*subscript2*C(CH*subscript3*)CH(CH*subscript3*)CHCH*suscript2*]+ it reads from left to right like this: [CH3CH2C(CH3)CH(CH3)CHCH2]+

*September 9, 2013*

**Chemistry**

I am having issues drawing the lewis structure for this...can anyone explain? CHCCH*subscript2*CH0

*September 9, 2013*

**Math**

Can someone check my work? the problem is: x=2+3/y and I have to solve for y I get rid of the denominator y and multiply it with X...so it looks like xy=5 then just divide by x on both sides for a final answer of y=5/x

*September 1, 2013*

**Algebra**

I am completely lost...please anyone can anyone help? x = 2+y x and 2 are in inches then it says solution y=x(in) - a(in)

*September 1, 2013*

**math**

If we use binets formula for the fibonacci numbers we can trivially see that Fp=5^(p-1)/2 mod p implying that the only prime p such that p divides Fp is 5 divides F5=5.

*June 18, 2013*

**additional mathematics**

0.05909 😀😀😀

*June 2, 2013*

**math**

how do I set up this problem. John has bag of candy, gives 1/2 to his brother and 1/3 of remaining to his sister and has 15 left? how many did he start with?

*May 31, 2013*

**statistics**

Sunday? It's Monday.

*May 18, 2013*

**statistics**

Difference being, I've finished. Without help. Unlike you.

*May 18, 2013*

**statistics**

Even more ridiculous that you are asking for answers for a test.

*May 18, 2013*

**mechanics**

Find the total kinetic energy of a 1500 g wheel, 700 mm in diameter, rolling across a level surface at 650 rpm. Assume that the wheel can be considered as a hoop. (b) For the wheel in part (a), calculate the torque required to decrease its rotational speed from 400 rpm to rest...

*May 14, 2013*

**programming**

Write a program reads the city names and respective gas prices into 2 single-subscripted arrays in your program - one of type string, the other of type double. (We would call these "parallel arrays" - each corresponding location shows the city name and gas price for ...

*May 13, 2013*

**Chemistry**

what is the rate of a first-order reaction that has a reactant concentration of 1.1M and a rate constant of 0.14/s?

*May 1, 2013*

**Math**

A jar contains 1 blue crayon, 1 green crayon, 1 black crayon, and 1 red crayon. You grab 1 crayon without looking. Find the sample space for this experiment.

*April 30, 2013*

**Chemistry**

Consider the titration of 50 mL of 0.250 M HCl with 0.1250 M NaOH. Calculate the pH of the resulting solution after the following volumes of Na OH have been added. a) 0.00 mL b) 50.00 mL c) 99.90 mL d) 100.00 mL e) 100.1 mL The question is, I get, for example, 0.9 pH for "...

*April 27, 2013*

**Public Speaking**

C for both questions

*April 24, 2013*

**Public Speaking**

So it's C

*April 24, 2013*

**Public Speaking**

Patrick Henry’s famous speech carries the theme “give me liberty or give me death.” This is a speech about: A. events. B. processes. C. concepts. D. objects. This one I'm stuck between C and D

*April 24, 2013*

**Public Speaking**

Which of the following is NOT true about persuasive speaking compared to informative speaking? A. Involves more emotional appeal. B. Asks for commitment from the audience. C. Impartial point of view. D. Emotion-evoking language. Is this one B?

*April 24, 2013*

**Public Speaking**

Speeches of tribute are intended to do all of the following EXCEPT: A. express feelings. B. inspire the audience. C. arouse sentiments. D. describe an object. This one I believe is D

*April 24, 2013*

**Public Speaking**

Effective public speaking is: A. audience-centered. B. message-centered. C. speaker-centered. D. channel-centered. I believe this one is A

*April 24, 2013*

**Public Speaking**

I believe it's B

*April 24, 2013*

**Public Speaking**

A speaker talking about the benefits of cosmetic surgery to an audience primarily of women is appealing to which level of needs in Maslow’s Hierarchy of Needs? A. Physiological needs B. Esteem needs C. Belongingness and love D. Safety needs

*April 24, 2013*

**chemistry**

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)

*April 15, 2013*

**chemistry**

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)

*April 15, 2013*

**chemistry**

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)

*April 15, 2013*

**ecc**

Arginine vasopressin is a pituitary hormone. It helps regulate the amount of water in the blood by reducing the flow of urine from the kidneys. An aqueous solution containing 21.6 mg of vasopressinin 100.0 mL of solution has an osmotic pressure at 25 ¢ªC of 3.70 mmHg...

*April 15, 2013*

**chemistry**

Arginine vasopressin is a pituitary hormone. It helps regulate the amount of water in the blood by reducing the flow of urine from the kidneys. An aqueous solution containing 21.6 mg of vasopressinin 100.0 mL of solution has an osmotic pressure at 25 ¢ªC of 3.70 mmHg...

*April 15, 2013*

**chemistry**

What is the molality of a solution which contains 20.0 g of cane sugar, C12H22O11 dissolved in125g of water?

*April 15, 2013*

**chemistry**

Determine the mole fractions of both substances in a solution containing 36.0 g of water and 46.0 gof glycerin, C3H5(OH)3?

*April 15, 2013*

**ecc**

Describe how you would make up3.2 g of a 5.00% aqueous solution of NaCl(i.e. find masses of the components that need to be mixed).

*April 15, 2013*

**ecc**

Describe how you would make up3.2 g of a 5.00% aqueous solution of NaCl(i.e. find masses of the components that need to be mixed).

*April 15, 2013*

**ecc**

Describe how you would make up3.2 g of a 5.00% aqueous solution of NaCl(i.e. find masses of the components that need to be mixed).

*April 15, 2013*

**ecc**

A solution was prepared by dissolving 0.834 g of sulfur, S8, in 100.0 g of acetic acid, HC2H3O2. Calculate the freezing point and boiling point of the solution. (Use the table from the textbook.)

*April 15, 2013*

**chemistry**

What is the vapor pressure at 23 ¢ªC of a solution of 1.20 g of naphthalene, C10H8, in 25.6 g of benzene, C6H6? The vapor pressure of pure benzene at 23 ¢ªC is 86.0 mmHg; the vapor pressure of naphthalene can be neglected. Calculate the vapor pressure ...

*April 15, 2013*

**Physics**

Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from Earth?

*April 10, 2013*

**physics**

Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 80 kg, who is 0.1 m from the baby.

*April 10, 2013*