Tuesday

February 28, 2017
Total # Posts: 113

**physics**

A hole is drilled through a copper plate whose temperature is 17.2 °C. When the plate is heated to 191 °C, by what fraction (r-ro)/ro will the radius of the hole change?

*February 14, 2017*

**physics**

A thin spherical shell of silver has an inner radius of 5.58 x 10-2 m when the temperature is 25.7 °C. The shell is heated to 133 °C. Find the change in the interior volume of the shell.

*February 14, 2017*

**physics**

A flask is filled with 1.53 L (L = liter) of a liquid at 92.2 °C. When the liquid is cooled to 15.1 °C, its volume is only 1.36 L, however. Neglect the contraction of the flask. What is the coefficient of volume expansion of the liquid?

*February 14, 2017*

**physics**

The Eiffel Tower is a steel structure whose height increases by 19.7 cm when the temperature changes from -9 to +40 oC. What is the approximate height (in meters) at the lower temperature?

*February 14, 2017*

**physics**

A steel aircraft carrier is 358 m long when moving through the icy North Atlantic at a temperature of 1.99 °C. By how much does the carrier lengthen when it is traveling in the warm Mediterranean Sea at a temperature of 22.0 °C?

*February 14, 2017*

**physics**

When the temperature of a thin silver [? = 19 × 10-6 (C°)-1] rod is increased, the length of the rod increases by 3.6 × 10-3 cm. Another rod is identical in all respects, except that it is made from gold [? = 14 × 10-6 (C°)-1]. By how much ?L does the...

*February 13, 2017*

**algebra**

For Beth to get an A in her Spanish course she must earn a total of 360 points in 4 test each worth 100 points. If she got scores of 87, 96 and 91 on the first 3 test, determine using an inequality those scores she could make on the fourth test to get an A.

*January 7, 2017*

**College Physics**

An airplane has a mass of 3.19 × 104 kg and takes off under the influence of a constant net force of 1.56 × 104 N. What is the net force that acts on the plane's 82.1-kg pilot?

*January 4, 2017*

**Physics**

Water flows through a garden hose that goes up a step 20.0 cm high. The cross sectional area of the hose on top of the step is half that at the bottom of the step. If the water pressure is 143 kPa at the bottom of the step, and the speed of the water at the bottom of the step ...

*December 2, 2016*

**math**

ty uses 20ft of fencing to make a rectangular garden.he devides the rectangle into 4 equal squares all in 1 row.the side of each row is 2ft long.what is the area of the garden? i dont know how show representations,or write an equation for this problem please help me, Matt 47 ...

*November 2, 2016*

**physics**

A charge q1 = 5 nC is located at the origin of xy copedinate system, and a charge of q2 = -2 nC is located on the y-axis at y =.30m. Find the components of the electric field and its magnitude and direction at a point P with coordinates (.40m, .30m).

*March 9, 2016*

**physics**

Three charges, +2.5 micro coulomb, -4.8 micro coulomb and 6.3 micro coulomb, are located at (0.20m, .15m), (.50m, -.35m), and (-.42m,-.32m) respectively. What is the electric field at the origin?

*March 9, 2016*

**science**

Three charges, +2.5 micro coulomb, -4 micro coulomb and 6.3 micro coulomb, are located at (0.20m, .15m), (.50m, -.35m), and (-.42m,-.32m) respectively. What is the electric field at the origin?

*March 9, 2016*

**science**

What would be the volume of hydrogen(2g/mol) needed in a balloon to lift a 50kg man? Assume that the temperature is 300K pressure is 1atm and air has average mass of 29 g/mol and that both gases behave ideally.

*January 19, 2016*

**physics**

An object is thrown upwards at an initial speed of 19.6 m/s from a height of 40.0 m. Determine how long it will take for the object to reach the ground.

*January 22, 2015*

**Algebra**

a rectangular lot whose perimeter is 1600 feet is fenced on three sides. An expensive fencing along the lot's length cost $20 per foot, and an inexpensive fencing along the two side widths costs $5 per foot. The total cost of fencing along the three sides comes to $13000. ...

*January 19, 2015*

**Math**

An ostrich. An run at a rate of 50 miles every 60 minutes. At this rate how long will it take an ostrich 15 miles?

*November 5, 2014*

**Science Help PLEASE!!**

Omg thanks so much Ben ur the best if i knew u i would totally owe u one i got an 100% on my test . Yea my school lets us search our answers during a test.

*March 11, 2014*

**Math**

a map of Vicksburg Mississippi has a scale of 1 mile to the inch. The map has been reduced so that 5 inches on the original map appears as 1.5 inches on the reduced map. The distance between two points on the reduced map is 1.75 inches. What is the actual distance in miles?

*February 2, 2014*

**math**

a scale drawing is 10 cm:1mm Which will be larger the actual object or the scale drawing and why

*January 28, 2014*

**`Math**

A rectangular park has an area of 6 square miles. The width of the property is 3/8 the length of the property. What is the width of the property?

*April 16, 2013*

**Lang. Arts**

Answer is B!!!

*March 15, 2013*

**math**

What are equivalent expressions for 6(y-1)?

*December 10, 2012*

**Chemistry**

if 0.80g of magnesium react with 40.0s calculate the reaction rate

*November 14, 2012*

**Chemistry**

if

*November 14, 2012*

**chemistry**

27,200

*September 2, 2012*

**political science**

the system of government in the state of CA can be described as : a.unitary system b.federal system 18).the constitution grants state governments: a. enumerated powers c.enumerated and defined powers

*May 22, 2012*

**geology**

which form of mass wasting probably moves more material than any other? areas of deposition on the insides of meanders are known as: Name given delta with smooth D-shaped outline (Nile Delta) A(n)__________ stream is one in which water tends to sink into the ground because the...

*May 9, 2012*

**math**

please explain the steps: Jim Williamson began a 96-mile bicycle trip to build up stamina for a triathlete competition.Unfortunately, his bicycle chain broke, so he finished the trip walking. The whole trip took 6 hours.If Jim walks at a rate of 4 miles per hour and rides at ...

*April 14, 2012*

**college math**

1). Sum of three numbers is 45. One number is five more than the second number.It is also twice the third.Find the numbers. 2).Perimeter of quadrilateral is 52in. Longest side is is three times as long as the shortest side. The other two sides are equally long and are 5 in. ...

*March 11, 2012*

**Chemistry**

Write balanced equations that describe the following reactions. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.) a) the dissociation of perchloric acid in water b) the dissociation of propanoic acid (CH3CH2CO2H) in water c...

*February 28, 2012*

**Chemistry**

What mass of HNO3 is present in 248.6 mL of a nitric acid solution having a pH = 5.04?

*February 28, 2012*

**math**

please explain: sam invested part of his $25,000 bonus in a fund that paid 8% profit and invested the rest in stock that suffered a 3% loss. Find the amount in each investment if his overall net profit was $1230.

*February 7, 2012*

**Intergrated physics and chemistry**

A 52.0-kilogram skateboarder does a trick on a half-pipe. During the trick, he reaches a speed of 8.90 m/s. The radius of the half-pipe ramp is 3.00 meters. What is the minimum centripetal force necessary to keep the skater on the ramp?

*January 26, 2012*

**qchs**

Each half is my guess...

*January 26, 2012*

**math**

34.0

*October 31, 2011*

**physics**

At 7.35 cents per kiloway hr, A. what does it cost to operate a 10.0 hp motor for 8.00 hr? B. What does it cost to leave a 75W light burning 24 hr a day?

*October 18, 2011*

**Algebra 2**

last question, what is the most affective way to solve for slope when involving ordered pairs, ex. (8,-9) (2,-1) i learned this in class today, but information doesn't stick well in my head :)

*September 12, 2011*

**math**

four come before five, but four is an audience, and 5 is a village :P best i got

*September 12, 2011*

**Algebra 2**

um i fail, the problem its self is 5(6-4x) = X + 21

*September 12, 2011*

**Algebra 2**

Solve equation and show steps, explain, and i would like to thanks mrs. sue, who answered my last question, and i would like to thank in advanced whoever answers this question :)

*September 12, 2011*

**Algerbra 2**

Simplify and show the steps to the problem 4(14x-10y) - 6( y + 4x)

*September 12, 2011*

**Math**

259-29=230 the answer is 38 remainder 2

*September 5, 2011*

**physics**

A game show contestant won a prize by pushing a bowling ball 20 m using her nose. The amount of work done was 1470 J. How much force did the contestant exert on the ball?

*June 30, 2011*

**physical science**

A object that has a mass of .25kg is moving with a momentum of 5 kg„ªm/s. What is its velocity?

*June 28, 2011*

**physical science**

A marble is rolling at a velocity of 1.5 m/s with a momentum of 0.10 kg m/s. What is its mass?

*June 28, 2011*

**physical science**

A steel ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/s. What is its momentum?

*June 28, 2011*

**physical science**

When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball farther?

*June 28, 2011*

**physical science**

When you are driving a golf ball, a good follow-through helps to increase the distance of the drive. A good follow-through means that the club head is kept in contact with the ball as long as possible. Why does this technique allow you to hit the ball farther?

*June 28, 2011*

**phtsical science**

Which has greater momentum, a 2.0kg hockey puck moving east at 2.5m/s or a 1.3kg hockey puck moving south at 3.0m/s?

*June 28, 2011*

**English 2**

Looked

*May 13, 2011*

**Geometry**

Will an octagon and an isosceles triangle tessellate a plane?

*April 28, 2011*

**English I**

Romeo and Juliet In three (or less) paragraphs discuss whether Shakespeare alludes to night in a positive or negative way. Noting as may instances you can d=find where the word night appears then determine whether the word has a positive or negative connotation. Thanks in ...

*April 8, 2011*

**English I**

Romeo and Juliet In three paragraphs (or less) discuss the threats to Romeo and Juliet's happiness which acts 1 and 2 have introduced.

*April 8, 2011*

**English**

Can anyone summarize acts II and III of Romeo and Juliet into two separate paragraphs? I can't seem to put the scenes into detail for my upcoming play. Something detailed please and thank you!

*April 2, 2011*

**Algebra I**

Can anyone summarize the quadratic formula? I am trying to understand this for algebra without any unnecessary and overused words involved like Wikipedia and sites that give me a headache. I just want a paragraph (or more than if its impossible to paraphrase) that is straight...

*March 21, 2011*

**chemistry**

You discover that the volume of the material is 150 mL. Its mass is is 1701g. What is its density?

*February 1, 2011*

**math**

how do you find the perimeter of four and one half , three and one half , three and two thirds ,two and two thirds and eight feet and one feet

*January 17, 2011*

**Math**

2/ f23

*November 8, 2010*

**Physics**

As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?

*November 1, 2010*

**Physics**

As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?

*November 1, 2010*

**Physics**

As Alan is taking a shower, the soap falls out of the dish and Alan steps on it with a force of 500 N. If Alan slides forward and the frictional force between the soap and the tub is 50 N, what is the coefficient of friction between these two surfaces?

*November 1, 2010*

**Physics**

On the Sun and 63020 N

*November 1, 2010*

**Physics**

1. Gunter, the weightlifter, can lift a 230.0 kg barbell overhead on Earth. The acceleration due to gravity on the sun is 274 m/s2. 2. a. Would the barbells be heavier on the sun or on the Earth. heavier on the sun b. How much (in Newtons) would the barbells weigh on the sun...

*November 1, 2010*

**physics**

100/20 = 5

*November 1, 2010*

**gateway**

What did the ape thimk about the grape's house

*September 28, 2010*

**algebra**

how many liters of a 14% alcohol solution must be mixed with 20 L of a 50% solution to get a 30% solution? Help!

*September 24, 2010*

**preschool**

Try pecentralorg great site full of pe lessons for all grades and ages.

*September 23, 2010*

**Gym (Physical Education)**

Not only should you practice at home, but if you are have that much difficulty then you should being using a modified push-up until you can comfortably perform a push-up. Now by modified I refer to either using the steps on your stair just as you would perform a normal push-up...

*September 23, 2010*

**social studies**

why did the Catholic Church and French monarchy oppose HIM/IT?

*September 12, 2010*

**Calculus**

Find the slope of the graph y=x^9-2x+(square root of 5-x)^3 @ (1,7)

*September 11, 2010*

**History**

Analyze the social/cultural/economic responses of the British, French, and Spanish to the Native Americans of North America prior to 1750

*September 7, 2010*

**Language**

Write the missing letters of each given verb. The meaning of the verb is given to help you identify the missing letters. 1.c_ _ _ _ e. To make a noise like a hen 2.p_ _ _ _ _ d. To imagine 3.h_ _e. To walk

*September 6, 2010*

**3rd grade**

Synonyms of to imagine

*September 6, 2010*

**Calculus**

What is the largest rectangle that can be inscribed in the first quadrant of the ellipse 9x^2+16y^2=144?

*July 11, 2010*

**grammar**

identify the case of the noun "statesman" in the sentence ben franklin was a great statesman

*May 6, 2010*

**Chemistry**

Hope this helps!!! D= 0.480 g/l T= 260.0°C+ 273= 533K P= 0.140 ATM R(constant; always 0.08206) M(molar mass)= DRT/P M= 0.480× 0.08206× 533/ 0.140= 149.96 g/mol Molar mass of geraniol= 149.96 g/mol

*May 4, 2010*

**6th Grade Grammar**

identify the case of the noun "stateman" in the sentence at that time ben franklin was a great statesman

*April 21, 2010*

**elementary math**

I am going to be a teacher one day. I need help explaining this: A student asks whether it is easier to add fractions or multiply fractions. What my respone should be?

*August 22, 2009*

**chem**

how do you find the number of electrons in an ionic compound chart, if you haven't been given the charge? Would someone be able to please tell me? thanks

*March 9, 2009*

**4th grade**

I found it: INSTINCT

*September 16, 2008*

**4th grade**

I have this question too. It is an 8 letter word in a crossword puzzle in Abeka Science. Anyone have an answer? "a God-given ability that is inherited rather than learned"

*September 16, 2008*

**Algebra Quadratic Equations**

I am supposed to write a quadratic equation using only the solutions and I am only given one solution:4. It can't be (x-4)=0. Can I use 0 to make (x-4)(x+0)=0?

*February 28, 2008*

**Algebra Variation Constant**

Thank you Reiny

*February 27, 2008*

**Algebra Variation Constant**

What does this mean? Do I graph this or what? Find the variation constant and an equation of variation where y varies directly as x and y=12 when x=2 The variation constant =? The equation of variation is y=?

*February 27, 2008*

**Algebra I need the formula not the answer**

TYPO 169cm^2 My apologies.

*February 26, 2008*

**Algebra I need the formula not the answer**

If the sides of a square are lengthened by 8cm the area becomes 169^2. Find the length of a side of the original square. I am getting 34.25cm

*February 26, 2008*

**Algebra**

-5x^3+7x^2+9x+5 The degree of the polinomial is 5?

*February 26, 2008*

**Algebra**

would the GCD for -42a^2 and 7a^5 be 7a?

*February 26, 2008*

**Algebra**

10^7x8.48= 848,000,000?

*February 25, 2008*

**Algebra**

GCF for the group of terms -42a^4, 7a^5 42a?

*February 25, 2008*

**Algebra**

Find the following. Assume that variables can represent any real number. SqRt(a+8)^2= 8a^2?

*February 25, 2008*

**Algebra**

(sqrt3+5 sqrt6)(sqrt3-5 sqrt6) DRWLS-Just take the difference of the squares of the two terms, sqrt 3 and 5 sqrt6. Then you will have the answer. It will be a negative integer. 3sqrt is 9 6sq rt is 36 I add 5 to one and subtract 5 from the other? 50 and 55, then I am supposed ...

*February 3, 2008*

**Algebra Sq Rt**

3sqrt is 9 6sq rt is 36 I add 5 to one and subtract 5 from the other? 50 and 55, then I am supposed to multiply? 50x55=2750? Or is the difference -5?

*February 2, 2008*

**Algebra Sq Rt**

This looks like a trick question (sqrt3+5 sqrt6)(sqrt3-5 sqrt6) Do I sq 3 or do I add 3 and 5 first? I think I have to do the same to both sides.

*February 2, 2008*

**Algebra Sq Rt**

Thank you. It is not the answer I have so I will rework it until I understnd. Thanks again.

*February 2, 2008*

**Algebra Sq Rt**

to multiply the sq rt of 3 cubed by the sq rt of 9 cubed I first need to factor them? So 9 3 times =729? and 3, 3 times is 9. Then multiply the two? to get 6561? Or Do I multiply 3 times 9 for 27 and add the 3+3 on the left of the radicand for 6? Is my answer a whole number or...

*February 2, 2008*

**Algebra multiplying sq rt**

I multiply the sq rt numbers to get 12 yes? and then do I multiply the x times 7x to get 7x^7?

*February 2, 2008*

**Algebra multiplying sq rt**

I need to use rational exponents to write the answer to: the cube root of x times the 4 root of 7x. there is a rule when the numbers on the radicand are different, yes?

*February 2, 2008*