Wednesday

January 28, 2015

January 28, 2015

Total # Posts: 76,810

**Physics**

A 0.422-kg ball with a speed of 1.31 m/s rolls across a level surface toward an open 0.348-kg box that is resting on its side. The ball enters the box, and the box (with the ball inside it) then slides across the surface a distance of 0.473 m. What is the coefficient of ...
*November 9, 2014*

**Physics**

A 18 g bullet is fired into the bob of a ballistic pendulum of mass 1.4 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet.
*November 9, 2014*

**Physics**

A 0.9-kg block (mass m) and a second block (mass M) are both initially at rest on a frictionless inclined plane. Mass M rests against a spring that has a force constant of 12.2 kN/m. The distance d along the plane between the two blocks is 3.64 m. The 0.9-kg block is released...
*November 9, 2014*

**chemistry**

How do you write a balanced equation for the preparation of phenylmagnesium bromide and it's reaction with benzophenone followed by neutralization in acid?
*November 9, 2014*

**Physics**

Traveling at a speed of 22m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of friction between the tires and the road is 0.68. How much time does it take for the car to come to a halt? As usual, ignore the effects of air ...
*November 9, 2014*

**Early Childhood**

Changed my answer to (c) because consequences are a result of your actions. Any one else have thoughts on this
*November 9, 2014*

**biomechanics**

Consider an experiment where a subject lands during two conditions from a height of 0.2 m. During the first landing condition, the subject lands 'stiffly' (e.g., very little knee flexion). During the second landing condition, the subject lands 'softly' (e.g., ...
*November 9, 2014*

**English**

B.may have a plural subject. C.will need commas to separate three or more verbs. D.all of the above I am think A have a singular subject
*November 9, 2014*

**English**

A sentence with a compound predicate A. may have a single subject
*November 9, 2014*

**anthropology**

A key concept for understanding male dominance in gender-stratified societies is the idea of
*November 9, 2014*

**Chemistry **

Is my answer correct? Calculate the mass of frost (water ice) on a piece of dry ice that would completely react with 2 mmol of phenylmagnesium bromide. (1/44 CO2)*(0.002mol of phenylmagnesium bromide)= 0.0000455
*November 9, 2014*

**Pre-trig/Calc**

Please help me. Use Descartes' rule of signs to describe the roots for each polynomial function. 3. m(x)=x^3+3x^2-18x-40
*November 9, 2014*

**Math**

Can someone please check to see if I answered these true and false statements correctly? Thank you! 1. A triangle can have two right angles. (TRUE??) 2. An equilateral triangle is also an acute. (TRUE??) 3. A right triangle can also be an isosceles. (TRUE??) 4. A scalene ...
*November 9, 2014*

**government**

Democrats lost governor’s races in blue states like Massachusetts and Maryland.
*November 9, 2014*

**government**

Explain the results of the elections in Maryland
*November 9, 2014*

**government**

Donna Edwards didn't win right??
*November 9, 2014*

**government**

what will be the impact of this election on federal versus state power (federalism)
*November 9, 2014*

**government**

What effect does the result of the republican party winning the election have on the Obama presidency?
*November 9, 2014*

**chemistry**

1. (3.0x10^4) divided by (6.2x10^1) = 5x10^2? 2. (4.7x10^-3) divided by (9x10^-4) = 5x10^-6 3. (3.0x10^4) times (6.2x10^1) =1.9x10^6 4. (4.7x10^-3) divided by (9x10^-4) =5x10^-6 5. (5.1x10^2) divided by (3x10^4)
*November 9, 2014*

**geography**

How does life in Istanbul differ from life in rural Turkey? A) Istanbul is more modern than rural Turkey B) Women in Istanbul do not work outside the home, whereas they do work outside the home C) Istanbul does not have a mixed economy and rural Turkey does D) Istanbul is ...
*November 9, 2014*

**physics**

An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5°C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to ...
*November 9, 2014*

**math**

A trail mix recipe calls for 6 cups of peanuts. You have 4 small packages that each contain 2/3 cup of peanuts. How many more cups of peanuts do you need to get?
*November 9, 2014*

**Chemistry**

If 500 mol of hydrogen gas occupies 5.00L at 25 celsius, what is the pressure in atm? I believe this is Ideal gas law. I can't figure out how to put it in the PV=nRT.
*November 9, 2014*

**Physics**

horizontal frictionless air track... why are you using Pi?
*November 8, 2014*

**history**

2. Roosevelt addressed the struggles of industry with the National Industrial Recovery Act (NIRA). Which of the following was not one of the main components of this effort? African American labor assistance Public works projects National Recovery Administration Fair practice ...
*November 8, 2014*

**Math**

In trapezoid CDEF, angle D = angle E=90degrees. Angle C =60 degrees, EF=4.5cm, and DE=3.5cm. What is the perimeter of the trapezoid to the nearest mm?
*November 8, 2014*

**Physics**

A small sphere of mass 2 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the lowest point of the trajectory if the speed at this point is 7m/s. Use g=9.8 m/s2.
*November 8, 2014*

**Physics**

A small sphere of mass 1 kg is attached to the end of a cord of length 1 m and rotated in a vertical circle about a fixed point O. If the speed at the uppermost point of the trajectory is 1 m/s, the sphere will have a circular trajectory (will move in a circle). Use g=9.8 m/s2.
*November 8, 2014*

**Physics**

A small sphere of mass 3 kg is attached to the end of a cord of length 2m and rotated in a vertical circle about a fixed point O. Determine the tension in the cord at the uppermost point of the trajectory if the speed at this point is 8m/s. Use g=9.8 m/s2.
*November 8, 2014*

**Physics**

A 1550 -kg car moves on a horizontal curved road. If the radius of the curve is 46 m and the coefficient of friction between the tires and road is 0.1, find the maximum speed the car can have so that it may not skid.
*November 8, 2014*

**Physics**

A coin is placed on a large disk which rotates uniformly at a rate of 2 rot/s. The coefficient of friction between the coin and the disk is 0.1. To what distance from the center of the disk should the coin be placed so that the coin may not slip? I know that mu times g (.1 x 9...
*November 8, 2014*

**Trigonometry**

An airplane approaches an airport. At a certain time, it is 939 m high. Its angle of elevation measured from the airport is 19.5◦. To the nearest metre, how far is the plane from the airport?
*November 8, 2014*

**Social Studies**

*know
*November 8, 2014*

**Social Studies**

yes I need to no which site I can read more about it so I can get ideas for my paper
*November 8, 2014*

**Social Studies**

information to show how the U.S. Constitution distributes and limits powers within the federal government.
*November 8, 2014*

**Math Question**

In △PQR, ∠R=90◦ ,∠P=58◦, and PR=7.1 cm. Determine the area of △PQR to the nearest tenth of a square centimetre.
*November 8, 2014*

**Spanish--1 question**

Why is it not always necessary to include a subject pronoun before the verb in Spanish?
*November 8, 2014*

**Spanish Help? Please.**

Explain how an interlocking schedule at a Puerto Rican school works. Why are interlocking schedules used? Why is it not always necessary to include a subject pronoun before the verb in Spanish? What is the heritage of many of the students at Miami High School? Explain why so ...
*November 8, 2014*

**Grammar**

Think critically or critically think
*November 8, 2014*

**chemistry**

3. If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity of the solution? [Use molecular weight: HCl, 36.46 amu] 5.20/36.46= 0.1426 X 3.00=0.428 M IS THIS CORRECT
*November 8, 2014*

**chemistry**

(4.7 x 10^-3 ) divided by (9 x 10^-4) = 5x10^-6
*November 8, 2014*

**chemistry**

so the first one is it 5x10^2?
*November 8, 2014*

**chemistry**

idk how you divide it
*November 8, 2014*

**chemistry**

so is this correct? 3rd is 1.86 * 10^6 4th is 1.53 * 10^7
*November 8, 2014*

**chemistry**

oh the question is to multiply and divide the significant figures ohh my mistake i thought i divided
*November 8, 2014*

**chemistry**

3rd is 1.86 * 10^6 4th is 1.53 * 10^7
*November 8, 2014*

**chemistry**

(3.0 x 10^4 ) ÷ (6.2 x 10^1) = 18.6x10^3 (4.7 x 10^-3 ) ÷ (9 x 10^-4) = 42.3x10^-7 (3.0 x 10^4 ) x (6.2 x 10^1) = 18.6x10^3 (5.1 x 10^2 ) x (3 x 10^4) = 15.3x10^-2
*November 8, 2014*

**Algebra 2**

Find x,y,z 2x-3y+z=-1 2x-y+2z=6 5x-4y+3z=6 Please show work I want to learn!!!
*November 8, 2014*

**MicroEconomics**

an accountant claims that she has found a legal way for Beth to shelter $3,000 of taxable income from the federal government. The maximum amount that Beth is willing to pay to learn this strategy and reduce her taxable income by $3,000 is
*November 8, 2014*

**Economic**

Beth is single and lives in New York. Beth earned $280,000 in 2011. The following table shows the IRS tax rates for a single taxpayer in 2011 On Taxable Income .. Tax Rates up to $8,500 10% From $8,500 to $34,500 15% From $34,500 to $83,600 25% From $83,600 to $174,400 28% ...
*November 8, 2014*

**Physics**

A billiard ball moving at 5.45 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.81 m/s, at an angle of 28Â° with respect to the original line of motion. Find the velocity (MAGNITUDE and DIRECTION) of the second ball after...
*November 8, 2014*

**economics**

6)Assume the graph below represents the market demand for a patented prescription drug together with the firm-level marginal cost and average cost functions for producing the drug. Assume these cost curves do not reflect R&D costs of developing this drug, but only reflect ...
*November 8, 2014*

**math**

the bearing of P from Q is 60. what is the bearing of Q from P?
*November 8, 2014*

**chemistry**

8.00g of NaOH are dissolved in water to make 4.00L of solution. What is the concentration of hydronium ions, [H3O+], in this solution? Express your answer with the appropriate units.
*November 7, 2014*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*November 7, 2014*

**physics**

a school bus traveling along a straight road from school was found to be 2.0km North of the school 4minutes later. In another 4minutes it was 4km West of the school. Draw the position of the bus from school.
*November 7, 2014*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*November 7, 2014*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*November 7, 2014*

**physics**

Two cars leave the same point at the same time, each travelling at the same constant speed of 89.0 km/h and each having the same mass. However, the first car drives directly east, while the second car heads directly south. At what speed (the magnitude of the velocity) is the ...
*November 7, 2014*

**physics**

how do you solve this???
*November 7, 2014*

**Pre-Calc/Trig**

Use Descartes' rule of signs to describe the roots of the polynomial function. m(x)=x^3+3x^2-18x-40
*November 7, 2014*

**physics**

Find the displacement of the car after 5.9 s. Answer in units of m
*November 7, 2014*

**Preschool Creative Thinking**

The eclectic theoretical approach that most teachers use means that: a. the major development theories are used on different days of the week on a rotating basis. b. one major developmental theory is used for toddlers, another for preschool, another for kindergarten, and the ...
*November 7, 2014*

**Preschool Creative Thinking and Arts Based Learnin**

Supporting "possibility thinking" means teachers are encouraging children to: a. first solve problems and follow directions, then "think outside the box." b. not merely solve problems but find them, then pose "what if" questions in their minds. c...
*November 7, 2014*

**Pre-Calc/Trig**

Help me please. List all possible rational zeros for the polynomial function. p(x)=3x^3-2x^2-5x-2
*November 7, 2014*

**anger management**

IM TAKING A ANGER MANAGEMENT CLASS AND I DONT UNDERSTAND THE QUESTION
*November 7, 2014*

**anger management**

did you ever confuse anger with aggression? please explain how.
*November 7, 2014*

**physics **

Static friction is smaller than kinetic friction because it is harder to keep an object than moving than to put it in motion.
*November 7, 2014*

**statistics**

what is the weight between 5.5 to 6 ounce when mean is 5,75 ounce and standard deviation is 0.11
*November 7, 2014*

**sentence structure**

What is the subject and predicate of this sentence? "There are children waiting." Is it "children are waiting" or "there are"?
*November 7, 2014*

**math**

How do you find the answer to 35.5×18.76
*November 7, 2014*

**Physics **

block slides across table with initial speed of 8 m/s coefficient of friction between block and table is .5 and table is 4 m long and 1.2 m high determine how far the block lands from the base of the table
*November 7, 2014*

**Physics**

block of mass 3.5 kg slides down frictionless incline that is 10 m long and inclined at angle of 37 when reaches bottom of incline it collides perfectly inelastically with another block of mass 2 kg then slides along a level floor if coefficient of friction between the block ...
*November 7, 2014*

**physics**

find displacement 4 vectors (1) 40 meters @10, (2) 30 meters @ 190 and (1)50 meters @ 280
*November 6, 2014*

**physics**

How high must your roof be to fire 1.2km if it fires at 450 m/s muzzle velocity?
*November 6, 2014*

**physics**

A cannon rests on the ground at 40 degree angle it fires a ball at 200 m/s how high is the top of trajectory? At what impact speed does it rest? How far away does it land?
*November 6, 2014*

**t**

A 15.7-L tank is filled with H2 to a pressure of 237 atm. How many balloons (each 2.00 L) can be inflated to a pressure of 1.00 atm from the tank? Assume that there is no temperature change and that the tank cannot be emptied below 1.00 atm pressure.
*November 6, 2014*

**physics**

A cannon 25m off the ground It fires horizontally at 320m/s muzzle velocity How close can it be to begin firing?
*November 6, 2014*

**math**

0.082 rounded to ?
*November 6, 2014*

**Science HELP**

I thinks it D. Because you can't convert chemical change, which mean product and reactant are completely different.
*November 6, 2014*

**Algebra**

symbolize and solve equations using: average prices of three items A, B, C is $ 16000, if the price of the item a is twice the sum of the prices of the items B and C
*November 6, 2014*

**Algebra**

symbolize and solve equations using: average prices of three items A, B, C is $ 16000, if the price of the item a is twice the sum of the prices of the items B and
*November 6, 2014*

**Calculus**

d/dx[(3x^2+2•sqrt of x)/x]=? Is it 3-(1/(x•sqrt of x))?
*November 6, 2014*

**pre-algebra**

a 50-pound bag of grass seed sells for 292.50. find the unit price of grass seed
*November 6, 2014*

**Algebra**

A grocer buys cases of almonds and walnuts. Almonds are packaged 20 bags per case. The grocer pays $30 per case of almonds and makes a profit of $17 per case. Walnuts are packaged 24 bags per case. The grocer pays $26 per case of walnuts and makes a profit of $15 per case. He ...
*November 6, 2014*

**physics**

A 15 kg rock is horizontally from very high cliff at a speed of 65m/s. what is the speed of the rock after it has fallen a vertical distance of 35m?
*November 6, 2014*

**Calculus**

oh thank you. this formate shows a lot better. Thank you Steve.
*November 6, 2014*

**Calculus**

please i need help, oi was looking towards similar problem, but i'm not sure how cube route 75 came into play with one of the problems that had 5 feet tall running parallel at 3 ft distance
*November 6, 2014*

**Calculus**

fence 3 feet tall runs parallel to a tall building at a distance of 7 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
*November 6, 2014*

**Algebra**

a grocer buys cases of almonds and walnuts. Almonds are packaged 20 bags per case . The grocer pays $30 per case of almonds and makes a profit of $17. Walnuts are packaged 24 bags per case. The grocer pays $26 per case of walnuts and makes a profit of $15 per case. He orders ...
*November 6, 2014*

**math**

Kelly has 4 times as many songs on her music player as Lou. Tiffany has 6 times as many songs on her music player as Lou. Altogether, they have 682 songs on their music players. How many songs does Kelly have. Please teach me the steps on how to do it I`m having trouble on ...
*November 6, 2014*

**French**

Please check these sentences for grammar. 1. Adorez-vous faire les magasins? 2. Est-ce que tu préféres lire à la bibliotheque ou écouter de la musique? 3. Est-ce tu ne préféres pas la pomme avec le petit dejeuner? 4. Est-ce tu n'...
*November 6, 2014*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*November 6, 2014*

**physics**

a 0.12 kg is sitting on a record with a diameter of 0.30 meters. the record completes one turn on 0.40 seconds
*November 6, 2014*

**physics**

What is the maximum speed that the car can turn in a curve of radius 29.0 m without slipping? The coefficient of static friction between a road and a car's tires is 0.500, and the coefficient of kinetic friction is 0.390. Assume that the road is horizontal and flat.
*November 6, 2014*

**english**

Anxiety is to test as procrastination is to
*November 6, 2014*

**physics**

A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 125mm . At the very bottom, the normal force on the driver is twice his weight.
*November 6, 2014*

**SS**

What are some features of Canadian culture that are different from American culture?
*November 6, 2014*

**matg**

jhb
*November 6, 2014*

**matg**

Cobalt-60 has a half-life of about 5 years. How many grams of a 300 g sample will remain after 20 years? (Points : 1)
*November 6, 2014*

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