Saturday

March 28, 2015

March 28, 2015

Total # Posts: 4,319

**math**

jenny opened a new loaf of bread to make a sandwiches for her friends. She needed 8 slices out of the 20 slices in the loaf. What percent of the loaf did she use?
*December 29, 2012*

**Astronomy**

Also Assuming that D is much greater than Rm find an approximate expression for the same tidal force, using Newton's approximation method
*December 23, 2012*

**Astronomy**

Suppose the Moon is at a (center-to-center) distance D from Earth. Find an exact expression for the magnitude of the tidal force applied by Earth to our rock of mass m in terms of D, m, the mass of Earth Me (input as M_e), and the lunar radius Rm (input as R_m).
*December 23, 2012*

**Astronomy**

Darwin proposed that the Moon formed far closer to Earth than it is now. Let’s see just how close it could possibly be to Earth and survive. In particular, in the next 4 problems you will find the distance from Earth at which the tidal force due to Earth is sufficient to ...
*December 23, 2012*

**Astronomy**

Consider the same asteroid initially in the asteroid belt at a distance 3 AU from the Sun, and 2 AU from Earth, which collides with Earth. As it falls towards Earth, it acquires kinetic energy (neglect its initial motion) both by being accelerated towards the Sun and towards ...
*December 23, 2012*

**Astronomy**

Consider an asteroid of radius 2 km and density 2,500 kgm3 impacting the Earth. When it collides with the surface its kinetic energy is, to a large extent, dumped into the environment, some as heat vaporizing rock and some as mechanical energy throwing rock to great distance ...
*December 23, 2012*

**Astronomy**

The volume of a ball is given in terms of its radius by V=4π3R3. Use this to find the average density of Saturn, i.e. the mass per unit volume. Use Earth’s mass in kg from the Table of Constants to express your answer in kgm3. Note for comparison that water has a ...
*December 23, 2012*

**Astronomy**

Saturn’s Moon Janus is observed to orbit the planet with period 0.695 days, grazing the planet with an orbital radius only 2.64 times the radius of the planet itself. Use this information to find the mass of Saturn. Express your answer as a multiple of the mass of Earth M...
*December 23, 2012*

**Astronomy**

At opposition, Saturn is observed to subtend an angular radius of 9.16 arcseconds (not including the rings). Use this and the conversion factors in our Table of Constants to find the radius of Saturn in km, rounded to three significant digits.
*December 23, 2012*

**Astronomy**

We observe that oppositions of Saturn repeat every 378 days. Use this information to find the sidereal period of Saturn. Express your answer in years and round to two significant digits.
*December 23, 2012*

**Physics**

82.2%?
*December 19, 2012*

**Physics**

If a drummer at a gig hits his a drum that has a diameter of .2m with a stick that has a mass of 0.5kg at .03m from the center. What percentage radial region is impacted with a force twice as great as the initial impact force?
*December 19, 2012*

**PHISIC**

I think kinetic energy is converted into gravitational potential then into strain energy .how about this is it correct plz help
*December 19, 2012*

**PHISIC**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 19, 2012*

**calculus**

tysm
*December 17, 2012*

**calculus**

it says lim as x>-3 x+3/ x^2+7x+12 I need to find the limity using subsitution, a table, or by graphing...
*December 17, 2012*

**science**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 17, 2012*

**physics**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 17, 2012*

**English - Ms. Sue help**

I need help with this question, I can't find the internal.
*December 17, 2012*

**Physics**

Its a balloon filled with the nitrogen gas balloon and its about the flow of nitrogen through a hole. The thickness of the balloon, total surface area and the diffusion coefficient is given. I am bit confused about the problem as well.
*December 15, 2012*

**Physics**

Hello I am trying to solve this physics problem related to effusion of gases. The following data is given and I am asked to calculate the rate of effusion The data given; depth/thickness (t) Surface area (A) diffusion coefficient (D) Can someone help me out? The only law ...
*December 15, 2012*

**physics**

wf^2 = wi^2 + 2 (alpha) * (angle of rotation (delta theta)) delta theta = (1.76^2 - 0.77^2) / 2*0.29 delta theta = 2.36 (check me on my math))
*December 13, 2012*

**Algebra help**

Dave buys 3 green peppers and 2 red peppers for $3.45. Ruth buys 4 green peppers and 3 red peppers for $ 5.00. Find the price of each variety of pepper.
*December 13, 2012*

**physic**

A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
*December 13, 2012*

**geometry**

an arrow pointing down
*December 10, 2012*

**math pre-calc h**

It says which expressiion is equivalent to sec T + csc T / 1+tan T a. sin t b. cos t c. tan t d. csc t I'm not sure what to do first to find it out.
*December 9, 2012*

**precalc h**

okay I get it now, thanks so much. I have another one at the bottom of this question.. could you help me with it? But THANKYOU SO MUCHCHCH! I get it. :--)
*December 9, 2012*

**precalc h**

OH nevermind about that .
*December 9, 2012*

**precalc h**

How would x'ing the right side of the plus side by sin give you (1-cos)^2
*December 9, 2012*

**precalc h**

I don't understand what you did?
*December 9, 2012*

**precalc h**

Theta = argument..
*December 9, 2012*

**precalc h**

The parenthesis were for the arguments.. My question was how do I verify this indentity
*December 9, 2012*

**precalc h**

sin(theta)/1-cos(theta) + 1-cos(theta)/sin(theta) = 2csc(theta) That question makes absolutely no sense.. could someone help me? or lead me in the direction to figuring it out? and.. (Beside the trig functions is theta) 1+1/cos = tan^2/sec-1
*December 9, 2012*

**English**

How coypu use duke in a sentence ?
*December 6, 2012*

**chemistry**

The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5°C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/mol·K. What is the vapor pressure of benzene at 70.0°C?
*December 5, 2012*

**Physics**

dont know
*December 5, 2012*

**chemistry**

I keep getting 469, but that's apparently not the answer...
*December 5, 2012*

**chemistry - still need help**

Never mind that one. I figured it out. But please help me with this one. The vapor pressure of benzene, C6H6, is 60.0 mm Hg at 13.5°C. The molar heat of vaporization of benzene is 30.8 kJ/mol and R = 8.31 10-3 kJ/mol·K. What is the vapor pressure of benzene at 70.0&...
*December 5, 2012*

**chemistry**

The vapor pressure of methanol is 84.0 mm Hg at 27.0°C. The ΔHvapor of methanol is 39.2 kJ/mol and R = 8.31 10-3 kJ/mol·K. Calculate the normal boiling point of methanol in Kelvin.
*December 5, 2012*

**math**

I say.........2 and 5/5
*December 5, 2012*

**math 6th grade**

does anyone know what y=x is
*December 4, 2012*

**math**

The quotient of a number and 3, minus 1, equals 5/3. Find the number.
*December 4, 2012*

**math**

In 6 hours,an experienced cook prepares enough pies to supply a local restaurant's daily order. Another cook prepares the same number of pies in 7 hours. Together with a third cook, they prepare the pies in 2 hours. Find how long it takes the third cook to prepare the pies...
*December 4, 2012*

**math**

One pipe fills a storage pool in 20 hours. A second pipe fills the same pool in 15 hours. when a third pipe is added and all three are used to fill the pool , it takes only 6 hours. Find how long it takes the third pipe todo the job.
*December 4, 2012*

**English**

5. cynic 6. benefactor 7. virile 8. demise 9. infamous 10.speculate
*December 3, 2012*

**English**

1-2. Nursing is a good career for Dee because it’s a(n) _____ part of her personality to try to _____ people’s pain. In addition, since she is physically and mentally strong, she will be able to handle the rigors of nursing, such as intense stress and long hours. 3-4...
*December 3, 2012*

**English**

chapter 14 sentence check 2... Although everything about the Nazis ﬁlled the Dutch spy with ____ (convert), his assignment was to ___(convert)peoples pain.
*December 3, 2012*

**world history**

What are five consequences of World War I? Write your answer in an essay of at least 125 words.
*December 3, 2012*

**science**

how much heat is required to heat 500 g of copper from 20 degree celsius to 80 degree celsius? specific heat of copper is 0.093 cal/g- degree celsius
*December 2, 2012*

**biology**

would you expect whitefish embryo cells to divide indefinitely?
*December 1, 2012*

**Physics**

Consider an artery with diameter 10 mm which runs horizontally. Somewhere along the artery there is a 3 cm long constriction which reduces the diameter to 5.40 mm. Assume that before and after the constriction the blood flows at a rate of 0.310 m/s, and that the blood ...
*December 1, 2012*

**calculate rms**

calculate the rms speed of nf3 molecules at 23 C?
*December 1, 2012*

**Chemistry**

If the sign contains neon at a pressure of 1.72 torr at 32 C, how many grams of neon are in the sign? (The volume of a cylinder is pie r2 h.)
*December 1, 2012*

**Chemistry**

n= PV/RT [(763-28.3)/760](0.605)/(8.314)(301.15) =0.000233592 x (2/3) = 0.000155728 x 122.5 g =0.019076722/2.677 x 100 = 0.710 % This result seems really small...what have i done incorrect?
*December 1, 2012*

**Chemistry**

You are given 2.677 g of a mixture of KClO3 and KCl. When heated, the KClO3 decomposes to KCl and O2, 2 KClO3 (s) → 2 KCl (s) + 3 O2 (g), and 605 mL of O2 is collected over water at 28 °C. The total pressure of the gases in the collection flask is 763 mm Hg. What is ...
*December 1, 2012*

**Chemistry**

Consider the following: CH4, SiH3Cl, Ar, and CH2F2. (a) Which one will diffuse the fastest? (b) What is the rms speed (m/s) of the slowest-moving atom or molecule at 25°C?
*November 30, 2012*

**Physics**

A baking dish is removed from a hot oven and placed on a cooling rack. As the dish cools down to 33° C from 181° C, its net radiant power decreases to 13.3 W. What was the net radiant power of the baking dish when it was first removed from the oven? Assume that the ...
*November 29, 2012*

**science**

15.0g of potassium acetate is added to 500.0mL of 0.50M solution of acetic acid. What is the pH and the pOH of the solution?
*November 29, 2012*

**algebra**

a farmer grows corn, tomatoes, and sunflowers on a 320 acre farm. this year the farmer wants to plant twice as many acres of tomatoes as sunflowers. The farmer also wants to plant 40 more acres of corn than of tomatoes. How many acres of of each crop should the farmer plant?
*November 28, 2012*

**Physics**

An object is placed 8 cm in front of a convex lens of focal length 6 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.
*November 28, 2012*

**chemistry**

how do i find the grams of potassium chloride per 100g of water in the saturated solution
*November 27, 2012*

**chemistry**

a saturated solution of barium chloride at 30 degrees Celsius contains 150 g water. how much addition barium chloride ca be dissolved by heating this solution to 60 degrees celsius? bacl2 at 30 degrees= 38.2 bacl2 at 60 degrees= 46.6
*November 27, 2012*

**Algebra II**

Write an equation for a parabola that opens upward from its vertex at (-4,3). What is the equation of its line of symmetry?
*November 27, 2012*

**science**

If you toss a coin five times and it lands heads up each time, can you expect the coin to land heads up on the sixth toss? Explain. Please help! Thanks!
*November 27, 2012*

**English**

Planned is a action verb. Is "is" a condition verb. Wears is a condition verb. Thank you
*November 27, 2012*

**English**

Is planned a condition or action verb? Is shower a condition or action verb? Is wears a condition or action verb?
*November 27, 2012*

**english**

Is upset an action verb? Is were an conditional verb?
*November 27, 2012*

**Chemisty**

A student following the procedure described in this experiment collected the following data: Mass Mg,g 0.0243 volume of gas mL 25.5 barometric pressure, mm Hg 298 Calculate the value of the gas law constant, R. Please help me work this out, I have no idea. Thank you!
*November 26, 2012*

**Physics**

A venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at a speed v2 through a horizontal section of pipe whose cross-sectional area A^2 = 0.0700 m2. The gas has a density of ρ = 1.80 kg/m3. The Venturi meter has a ...
*November 23, 2012*

**Chem**

What volume of 6.0 M sulfuric acid is required for the preparation of 500.0 mL of 0.30 M solution?
*November 21, 2012*

**Chem**

What volume of 6.0 M sulfuric acid is required for the preparation of 500.0 mL of 0.30 M solution?
*November 21, 2012*

**Chem**

What volume of 6.0 M sulfuric acid is required for the preparation of 500.0 mL of 0.30 M solution?
*November 21, 2012*

**math**

find the equation, in function form, of athe line that passes through the points(1/2,-3) and (7/6,5/9)
*November 19, 2012*

**Chemistry**

If water is added to magnesium nitride, ammonia gas is produced when the mixture is heated. Mg3N2(s) + 3 H2O(l) => 3 MgO(s) + 2 NH3(g) If 11.1 g of magnesium nitride is treated with water, what volume of ammonia gas would be collected at 23Â°C and 739 mm
*November 18, 2012*

**Geometry**

Given the points A(−2, 1) and B(3, 4), what are the coordinates of point C in the fourth quadrant such that mCAB = 90 degrees and AB = AC? Express your answer as an ordered pair.
*November 18, 2012*

**math**

Thank you
*November 18, 2012*

**math**

-(4/3)^2+(4/3)^0+4/3-(-4/3)^2+|-(4/3)^2|
*November 18, 2012*

**math**

y=x/4+4 x=21.5+7y/8
*November 17, 2012*

**math**

A rectangle has length of 2 3/4 m and a width of 4 2/3 m. A circle has a dia meter of 4.04 m. Which figure has the greater area?
*November 16, 2012*

**math**

Yuki's age is four years more than one-fourth of Xena's age. Xena's age is 21 years and 6 months more than seven-eighths of Yuki's age. How old are ena and Yuki?
*November 16, 2012*

**math**

juanita bought a coat on sale for 35% off the regular price. The cost of the coat was $78 before tax. What was the original price of the coat?
*November 16, 2012*

**Physics**

A 3 kg ball is traveling in a circle of radius 2 meters with a tangential velocity of 2 meters/second. Find the centripetal acceleration of the ball and the centripetal force acting on it.
*November 14, 2012*

**MSU**

Shirts Unlimited operates a chain of shirt stores that carry many styles of shirts that are all sold at the same price. To encourage sales personnel to be aggressive in their sales efforts, the company pays a substantial sales commission on each shirt sold. Sales personnel ...
*November 14, 2012*

**physics**

A tow truck does 3.5 k j of pulling horizontally on a stalled truck to move 2.8 m horizontally in the direction of the force. What is the magnitude of the force.
*November 13, 2012*

**Calculus**

V= 4/3 pi r^3 V= 4pi r^2 dt/dv 4= 4 pi (9)^2 dt/dv 1/81 pi
*November 12, 2012*

**Math**

$32.00
*November 12, 2012*

**Math **

There was an error... A tax charges $14 for a 7-mile trip. How much will the taxi charge for a 16-mile trip?
*November 12, 2012*

**Math**

A taxi charges 414 for a 7-mile trip. How much will the taxi charge for 16-mile trip?
*November 12, 2012*

**Physis**

A projectile is launched with an inital velocity of 30.0m/s at an angle of 60 degrees above the horizontal. How far does it travel. Please show me how to solve this.
*November 12, 2012*

**Math equation**

y + 1776 -1776 = 2003 - 1776 y = 227 y + 1776 = 2003 227 + 1776 = 2003 2003 = 2003 Checked But how is this correct true?
*November 12, 2012*

**Math equation**

I'm suppose to create my own equation like the one I showed you above. Is the first one right? It is solving subtraction equations where I add or subtract each side to undo the subtraction. Does this make sense? So if I were to say y + 1776 = 2003 this would be the right ...
*November 12, 2012*

**Math equation**

The Congress of the United States signed the Declaration of Independence in 1776. Find the difference in years between the year that the Congress signed this document and the year that you were born. I was born 2003. Is this right? y - 1776 = 2003 or 2003 - 1176 = y 6th grade ...
*November 12, 2012*

**Physics**

The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
*November 9, 2012*

**Algebra**

HELP!!! Super confused. Here's the problem. Today while Don was swimming, he started wondering how many lengths he would have to swim in order to swim different distances. At one end of the pool, he stopped, gasping for breath, and asked the lifeguard. She told him that 1 ...
*November 9, 2012*

**Math**

Two cards are selected at random without replacement from a well-shuffled deck of 52 playing cards. Find the probability of the given event. A pair is not drawn.
*November 8, 2012*

**Physics**

The pilot of an aircraft wishes to ﬂy due west in a 52.6 km/h wind blowing toward the south. The speed of the aircraft in the absence of a wind is 154 km/h. A.) How many degrees from west should the aircraft head? Let clockwise be positive. Answer in units of ◦ (...
*November 8, 2012*

**Physics**

to strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push ups. his center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0cm from the top of his head. find the force that the floor exerts on each of is feet ...
*November 7, 2012*

**math**

Tickets to the Senior Class Play cost $3.00 for students, $8.00 for adults, and $5.00 for senior citizens. At Friday night's performance, there were 121 students, 174 adults, and 32 senior citizens. At Saturday night's performance, there were 183 students, 140 adults, ...
*November 3, 2012*

**Physics**

A small 0.469-kg object moves on a frictionless horizontal table in a circular path of radius 1.42 m. The angular speed is 6.31 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under...
*November 3, 2012*

**Physics**

As seen from above, a playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this person begins with an ...
*November 3, 2012*

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