Friday

March 27, 2015

March 27, 2015

Total # Posts: 634

**Physics**

A tall strongman of mass m = 93 kg stands upon a scale while at the same time pushing on the ceiling in a small room.If the scale reads 1062 N (about 239 lb), what is the magnitude of the normal force that the ceiling exerts on the strongman?
*September 21, 2012*

**Physics**

A mass with M = 122kg is attached to the bottom of a block-and-tackle pulley system.How much tension force is needed to keep the mass at its current position?
*September 21, 2012*

**Physics**

A car travels at 64 mi/h when the brakes are suddenly applied. Consider how the tires of a moving car come in contact with the road. When the car goes into a skid (with wheels locked up), the rubber of the tire is moving with respect to the road; otherwise, when the tires roll...
*September 21, 2012*

**Physics**

An elevator is moving at 1.1 m/s as it approaches its destination floor from below. When the elevator is a distance h from its destination, it accelerates with a = −0.55 m/s2,where the negative sign indicates a downward vertical direction. Find h.
*September 21, 2012*

**Calculus**

Determine the polar form of the complex number 3 - 2i. Express the angle theta in degrees, where 0 < theta < 360°, and round numerical entries in the answer to two decimal places. 326.31(cos 326.31° – isin 326.31°) 3.61(cos 326.31° &#...
*September 21, 2012*

**US Government**

ideas on how to answer these?
*September 18, 2012*

**US Government**

help me answerthe question please. some ideas.
*September 18, 2012*

**US Government**

Explain how separation of powers and checks and balances reflect the founders' views of human nature and power in government. Discuss two other influences on the development of the U.S. Constitution
*September 18, 2012*

**Calculus**

Find the polar coordinates of (8, –8) for r > 0.
*September 17, 2012*

**Pre-calc**

1. Find the polar coordinates of (8, –8) for r > 0. 2.Find the rectangular coordinates of (9, 150°)
*September 17, 2012*

**phy**

A jet has a speed of 500m/s relative to the air in which it flies and is traveling north. There is a crosswind blowing from west to east at 100m/s. What compas heading does the plane appear to fly toward?
*September 16, 2012*

**algebra**

solve the inequality and write the solution set using interval notation. 4x+7 <2x+5 _____ -3
*September 15, 2012*

**Chemistry **

Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
*September 12, 2012*

**Chemistry **

Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
*September 12, 2012*

**Chemistry **

Calculate the volume of water, in milliliters, that would be displaced by a piece of gold weighing 18.2g.
*September 12, 2012*

**Math**

The car in the figure below travels a distance of 745 m along the track, and the driver finds that she has traveled through an angle of 475°. What is the radius of the track?
*September 6, 2012*

**Physics**

The car in the figure below travels a distance of 745 m along the track, and the driver finds that she has traveled through an angle of 475°. What is the radius of the track?
*September 6, 2012*

**Chemistry (quick clarification please?)**

Is 50 ml of a 50 mM solution of NaCl the same concentration as 100 ml of a 100 mM solution of NaCl?
*September 5, 2012*

**College Biology help!**

Is this true? Explain. To make a 100 osmolar solution of magnesium chloride, 60g of the salt are placed in a liter of water.
*September 5, 2012*

**algebra**

3x/y - 5
*September 3, 2012*

**Calculus**

TWO examples of each of the following: two sided limits and theorem on limits (SUM, difference, product, quotient, nth root, ).
*August 29, 2012*

**Algebra**

Hi! Just want to ask if 1/x-1 - x/x-1 equal to 1? That is what I got when I solved it. Thanks.
*August 13, 2012*

**Algebra**

(a^2 - 4a)/(a^2-a-6) minus (a-6)/a^2-a-6)
*August 13, 2012*

**Algebra**

Kindly solve this and give its restriction. (5-xy)/(9z) - (14+8xy)/(9z)
*August 13, 2012*

**Algebra**

Simplify the rational expression and write the restriction for the simplified rational expression. x^3 - 8 ----------------------- x^2 + xy - 2x - 2y
*August 5, 2012*

**Algebra**

The perimeter of a heptagon is 9a^2s ft. The perimeter of a triangle is 6a^6b^2s ft. Find the ratio of the perimeter of the heptagon to the perimeter of the triangle.
*August 5, 2012*

**AP World History**

How did rum play a role in the American Revolution?
*August 2, 2012*

**Math**

A rectangular sandbox has a length of 60 inches, a width of 40 inches, and a depth of 6 inches. What is the volume in cubic inches?
*August 2, 2012*

**chemistry**

What does 1.5 fold dilution and 2.5 fold dilution mean?
*July 26, 2012*

**Math**

I just did.. Thanks! Was it 3665?
*June 21, 2012*

**Math**

Oh, sorry. It was 2, not 3 ..
*June 21, 2012*

**Math**

i am a four digit numeral number between 3000 and 4000.My ones digit is 3 greater than my thousands digit.The two other digits are the same.If the sum of my digit is 20,what number am i?
*June 21, 2012*

**Math**

I am number greater than 70 000 but less than 90 000.My ones digit is the only even prime number.My tens digit id the same as my ones digit.My ten thousands digit is four times my ones digits.Both my hundreds and thousands digits are half the ten thousands digits.What number ...
*June 6, 2012*

**Math**

What is the least number that can be formed using 4 9 2 1 3 0 6?
*June 6, 2012*

**Math**

I am number greater than 70 000 but less than 90 000.My ones digit is the only even prime number.My tens digit id the same as my ones digit.My ten thousands digit is four times my ones digits.Both my hundreds and thousands digits are half the ten thousands digits.What number ...
*June 6, 2012*

**Math**

What is the greatest 7 digit number without repeating any digit?
*June 6, 2012*

**Math**

i am a 4 digit number between 3000 and 4000.My ones digit is twice my thousands digit.My hundreds digit is the same as my ones digit and my tens digit is one less than the hundreds digit.If the sum of my digit is twenty,what number am i?
*June 5, 2012*

**GEOMETRY**

Length of the diameter of a circle with the endpoints A(4, -3) and B(4, 3)
*May 30, 2012*

**Chemistry**

I have liquid concentrated HCl (37%w/w) To prepare 100ml of 10g/L HCl as a solvent medium, is it acceptable to just weigh 1g of liquid conc HCl and dilute to 100ml with water? What volume of conc HCl should we use to make 100ml of 10g/L HCl?
*May 28, 2012*

**writing**

Write a journal entry describing a day in the life of a snake in the wild from the snake's point of view. At least 5 sentences
*May 17, 2012*

**English**

would "the only heroic thing is the sky" be personification?
*May 17, 2012*

**Math :(**

Great answer and great way to explain. I would do the same thing. This is easy for me
*April 30, 2012*

**Math riddle**

122
*April 26, 2012*

**Accounting**

Please prepare the following journal entries. Indicate which account should be debited and which account should be credited along with the dollar amount of the debit and credit. a) Investors invested $100,000 in exchange for 10,000 shares of common stock. b) Company paid a ...
*April 19, 2012*

**Chemistry**

A 1.00-L solution saturated at 25°C with calcium oxalate (CaC2O4) contains 0.0061 g of CaC2O4. The solubility constant (Ksp) for this salt is [CaC2O4=128.09 g/mol]
*April 16, 2012*

**Chemistry**

How would you find the pH of a solution prepared by mixing 50 mL of 0.125 M KOH with o.050 L of 0.125 M HCl?
*April 16, 2012*

**physics 2**

A concave mirror has a focal length of 27.0 cm. The distance between an object and its image is 46.5 cm. Find the object and image distances, assuming the following. (a) that the object lies beyond the center of curvature do = di = (b) that the object lies within the focal ...
*April 10, 2012*

**hca/210**

examples of position in healthcare for the four functions of management
*April 9, 2012*

**Physics 2**

The average intensity of light emerging from a polarizing sheet is 0.807 W/m2, and the average intensity of the horizontally polarized light incident on the sheet is 0.972 W/m2. Determine the angle that the transmission axis of the polarizing sheet makes with the horizontal.
*April 5, 2012*

**math**

The average of two numbers is 34. The first number is three times the second number. what are the two numbers?
*April 1, 2012*

**Math**

Jillian must average at least 90 on two quiz scores before she can move to the next skill level. Jillian got a 92 on her first quiz. What scores could Jillian get on her second quiz in order to move to the next skill level? How could I answer this is an two-step inequality form?
*March 27, 2012*

**Physics**

A 30.0 kg box is being pulled across a carpeted floor by a horizontal force of 230 N., against a friction force of 210 N. Calculate the acceleration of the box and find the x and y components of the acceleration of the box. Align the positive direction with the normal force ...
*March 26, 2012*

**Physics**

Thanks! I did get this far, but it didn't seem right!
*March 26, 2012*

**Physics**

A loud speaker of mass 24.0 kg is suspended a distance of h = 2.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of 3.50 m. What is the tension in each of the cables?
*March 26, 2012*

**Science**

What does a thermohygrometer do?
*March 25, 2012*

**Chemistry**

How long can we use a bottle containing anti-bumping granules? Can it be used indefinitely?
*March 23, 2012*

**Chemistry**

I know that it's made up of one molecule from fructose and one molecule from glucose. i think it has a 12 Carbon atom ring... but that's really all I know
*March 22, 2012*

**Chemistry**

Can you label all the functional groups of the Sucrose Molecule?
*March 22, 2012*

**Probability **

Six marbles are chosen without replacement from a box containing 10 red, 8 blue, and 3 yellow marbles. Let X be the number of blue marbles chosen. a) Find the probability distribution of X. b) Find the mean of the random variable X
*March 22, 2012*

**Probability**

7) Suppose that you roll a pair of standard 6-sided dice a total of 42 times. What is the probability that you will get a sum of 5 at least four times?
*March 22, 2012*

**Chemistry**

What is the function of Compressed Air in GC-FID (i.e. Gas Chromatography-Flame Ionization Detector)?
*March 18, 2012*

**Science-Chemistry**

In the following test for Sulfated Ash, ammonium carbonate solution was added. What is the purpose of adding ammonium carbonate solution? Heat a silica crucible to redness for 30 minutes, allow to cool in a desiccator and weigh. Place 1g of the substance in the crucible and ...
*March 18, 2012*

**science**

Who would have to overcome inertia to move the ball, a golfer or a soccer player?
*March 15, 2012*

**Chemistry**

during a molar volume of oxygen experiment indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP. 1.) Your sample was not completely decomposed. 2.) After you finish heating sample & ...
*March 3, 2012*

**physics**

A balloon rubbed against denim gains a charge of -9 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 5 cm.
*March 1, 2012*

**physics**

Two electrostatic point charges of 83 µC and 50 µC exert a repulsive force on each other of 175 N. What is the distance between the two charges?
*March 1, 2012*

**Pre-Cal**

Convert the given exponential function to the form indicated. Round all coefficients to four significant digits. f(x) = 9e^3x; f(x) = Ab^x How do i solve the equation with this formula? Thanks
*February 29, 2012*

**math**

Solve variation problem if m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7
*February 24, 2012*

**Physics 2**

A cylindrical copper cable carries a current of 1170 A. There is a potential difference of 1.60 10-2 V between two points on the cable that are 0.21 m apart. What is the radius of the cable?
*February 16, 2012*

**Physics 2**

A(n) 78-Ù resistor and a 68-Ù resistor are connected in series across a battery. The voltage across the 78-Ù resistor is 25 V. What is the voltage across the 68-Ù resistor?
*February 16, 2012*

**potential**

What is the potential halfway between two point charges spaced 1 mm apart if q1=10 micro coulumbs and q2= -5 micro coulumbs?
*February 16, 2012*

**electric fields**

In an electic field described by E=(20i+60j) V/m, calculate the change in potential for a particle that moves from the origin to the coordinate (3,3) m?
*February 16, 2012*

**Physics**

A conducting hollow sphere of radius. 2m and charge 20 micro coulumbs. What is the potential of the sphere at a distance r from the center if: A)r= .1m? b)r= .2m? c) r=.3m?
*February 16, 2012*

**Physics**

You've got a conducting hollow sphere of rradius 0.2 m and a charge of 20 micro culumbs. What is the potential of the sphere at distance r from the center if : r=0.1 m? r=0.2 m? r=0.3 m?
*February 15, 2012*

**emily**

But v= k int. (Dq/r).....?
*February 15, 2012*

**gender**

Women not being allowed into the seals
*February 15, 2012*

**Calculus (Integrals)**

Actually none of the above
*February 15, 2012*

**Calculus (Integrals)**

56
*February 15, 2012*

**Chemistry-help**

Posted by anne on Wednesday, February 15, 2012 at 3:20pm. How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
*February 15, 2012*

**Chemistry**

How to prepare 1L of 96% v/v ethanol from 99% v/v ethanol? Can you show me the calculation steps?Thanks.
*February 15, 2012*

**Physics 2**

The wire in the figure below carries a current of 12 A. Suppose that a second long, straight wire is placed right next to this wire. The current in the second wire is 30 A. Use Ampère's law to find the magnitude of the magnetic field at a distance of r = 0.72 m from...
*February 13, 2012*

**Physics 2**

The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the center of the square is 91.5 µT. Calculate the current I.
*February 12, 2012*

**Physics**

A horizontal wire of length 0.48 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19° it experiences a magnetic force of 4.00 10-3 N...
*February 12, 2012*

**Chemistry**

wats Kf and kb
*February 9, 2012*

**Math**

Gymnast Clothing manufactures expensive hockey jerseys for sale to college bookstores in runs of up to 250. Its cost (in dollars) for a run of x hockey jerseys is C(x) = 2500 + 10x + 0.2^x2(0 ≤ x ≤ 250) Gymnast Clothing sells the jerseys at $105 each. Find the ...
*February 9, 2012*

**Math**

The associated exponential model for the value of a deposit after t years is A(t) = 7000(1 + (0.0394/12))^12t. At the start of which year will an investment of $7,000 made at the beginning of 2007 first exceed $11,000? (Round your answer the nearest whole number.) I don't ...
*February 9, 2012*

**Physics**

A capacitor is constructed of two concentric conducting cylindrical shells. The radius of the inner cylindrical shell is 2.35 10-3 m, and that of the outer shell is 2.49 10-3 m. When the cylinders carry equal and opposite charges of magnitude 1.61 10-10 C, the electric field ...
*February 1, 2012*

**Physics**

An electron is released from rest at the negative plate of a parallel plate capacitor and accelerates to the positive plate (see the drawing). The plates are separated by a distance of 1.4 cm, and the electric field within the capacitor has a magnitude of 3.5 106 V/m. What is ...
*February 1, 2012*

**Chemistry - thanks**

In a thin layer chromatography (TLC)experiment,the TLC plate was pre-developed in the development chamber containing the mobile phase (to remove any contaminants before use),then air dried. On the same day,the TLC plate was then spotted with the sample & standard and placed in...
*January 31, 2012*

**Chemistry-help needed**

I have a question on thin layer chromatography (TLC). My mobile phase (i.e. developing solvent) is a mixture of 2 non-polar solvents. After preparing the mobile phase, is it necessary to pour some into the developing chamber to saturate the chamber or should we only pour the ...
*January 31, 2012*

**Algebra**

I have 100 feet to surround three sides of a rectangle. What is the largest area that I can enclose?
*January 30, 2012*

**Physics**

Three point charges, -6.35 10-9 C, -8.20 10-9 C, and +7.75 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2210 V. What is the radius of the circle?
*January 30, 2012*

**Physics**

The drawing shows a square, each side of which has a length of L = 0.25 m. Two different positive charges q1 and q2 are fixed at the corners of the square. Find the electric potential energy of a third charge q3 = -7.00 10-9 C placed at corner A and then at corner B.
*January 30, 2012*

**Physics**

Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
*January 24, 2012*

**Physics**

Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2 at y2 = +0.38 m. A third point charge q = +8.5 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other ...
*January 23, 2012*

**Physics**

Two charges, -15 and +4.5 µC, are fixed in place and separated by 2.8 m. At what spot along a line through the charges is the net electric field zero? What would be the force on a charge of +1 µC placed at this spot?
*January 23, 2012*

**Science**

"When Environmental Hazards happen, what should you do?"?
*January 20, 2012*

**Chemistry-please help**

Please show me the calculation steps. How do I prepare 10%w/w Hydrochloric acid from 37%w/w Hydrochloric acid? The density of 37%w/w HCl is 1.19g/ml. Thank you.
*January 19, 2012*

**Chemistry**

A foundry releases 6.0 U.S. tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO subscript 2) by weight. How many pounds of sulfur dioxide are released in one week? Show all work needed.
*January 5, 2012*

**Chemistry**

thanks for the help :)
*December 13, 2011*

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