Wednesday

October 22, 2014

October 22, 2014

Total # Posts: 72,878

**math**

The scale for an earth model is 1:40000000. The diameter of the earth is 12,756.32km. a)What is the diameter of the model in cm? I got 31.9cm (just need help on part b!) b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered ...
*October 22, 2014*

**chemistry**

what amount of heat is needed to increase the temperature of 95.3g of copper from 25 degrees Celsius to 48 degrees Celsius? The value of Cp for copper is 0.387 degrees Celsius.
*October 22, 2014*

**Math**

um.. a) is supposed to be 31.9cm and b) is 240jars but i dont know how to get there.
*October 21, 2014*

**Math**

The scale for an earth model is 1:40000000. The diameter of the earth is 12,756.32km. a)What is the diameter of the model in cm? b) If the model is cut in half, how many jars of paint would be needed to paint each half if 1 jar covered 10cm^2?
*October 21, 2014*

**Algebra**

5x^3 - 12x - x^2 + 9 - 12x^5 - 6x^4 - k = 19 + 8x^3 - 18x - 19x^5 - 2x^2 - 8x^4 k = 7x^5 + 2x^4 - 3x^3 + 6x - 10?
*October 21, 2014*

**Chemistry **

What is the percentage of the S enantiomer in a sample of carvone that has a specific rotation of 30, given that the specific rotation of (R)-carvone is -61? How do i set up the problem?
*October 21, 2014*

**math**

the height thats not at the center but on the side?
*October 21, 2014*

**math**

but the answer is 9.0 and 10.8 won't work for the other questions :(
*October 21, 2014*

**math**

A right square pyramid has a surface area of 75.5m^2 and a base length of 3.5m. What is the slant height of this right pyramid?
*October 21, 2014*

**Science!**

Yes.
*October 21, 2014*

**Chemistry **

The structure of Crestor (rosuvastatin), a medication used to reduce cholesterol, is shown below. If the specific rotation for this compound is known to be +100, what would be the specific rotation for the stereoisomer shown at the right?
*October 21, 2014*

**science**

What is true about the element francium(Fr,atomic number 87)? Choose all that apply. a. it has 7 valence electrons b. it is likely to form ionic bonds c. it is a nonmetal d. it is in period 7 e. it is a metal Is the answer a,d,e?
*October 21, 2014*

**Calculus**

Find f'(a). f(x)=(x^2+1)/(x-2) Is it (x^2-5x+2)/(x-2)^2 ?
*October 21, 2014*

**Math**

If the lateral area of a cone is 3685.1cm^2 and I were to paint the entire cone, the paint costs $1.99/jar and one jar of paint covers 400cm^2, how much will it cost?
*October 21, 2014*

**physics**

An object attached to a horizontal spring is oscillating back and forth along a frictionless surface. The maximum speed of the object is 1.38 m/s, and its maximum acceleration is 5.82 m/s2. How much time elapses betwen an instant when the object's speed is at a maximum and...
*October 21, 2014*

**math**

timmy had 1/2 of pizza left over.for lunch,he ate 1/3 of the leftover pizza.how much pizza is now left?
*October 21, 2014*

**math**

timmy had 1/2 of pizza left over.for lunch,he ate 1/3 of the leftover pizza.how much pizza is now left?
*October 21, 2014*

**math**

Stretch your thinking. Use decimals and fractions in the same equation showing the commutative property. Repeat for the associative property
*October 21, 2014*

**physics**

thank you so much! definitely appreciate the help.
*October 21, 2014*

**physics**

sqrt(50^2+60^2) = 78.1 F=ma 78.1=(40)a ----> 78.1/40=a a= 1.95m/s^2 is this correct? :)
*October 21, 2014*

**physics**

two forces are applied to a 40kg object. one force is 50N and the other is 60N. if the forces are perpendicular to another, what will the resultant acceleration of the object be?
*October 21, 2014*

**Math**

Stretch your thinking. Write a subtraction equation with a difference of 54.57 . Then draw a number line to show between which two whole numbers the difference lies.
*October 21, 2014*

**Physics **

A 5.0kg box slides 8.0m down a ramp, inclined at 40degrees from the horizontal. If the box slides at constant velocity, the work done by gravity is? I used W=F*deltaX*costheta =(mg)*(deltaX)*(costheta) =(5.0)(9.8)*(8.0)* (cos50) Which I got 252 J. Is this correct?
*October 21, 2014*

**Physics**

What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal?
*October 21, 2014*

**Math**

kate wants to buy a new bicycle from a sporting-goods store.The bicycle she want normally sells for $360. The store has a sale in which all bicycles cost 5/6 of the regular price. what is the sale price of the bicycle?
*October 21, 2014*

**Math**

kate wants to buy a new bicycle from a sporting-goods store.The bicycle she want normally sells for $360. The store has a sale in which all bicycles cost 5/6 of the regular price. what is the sale price of the bicycle?
*October 21, 2014*

**English**

Thank You Ms. Sue College English is harder then I thought and haven't had to ask just a few questions and I am running a 98 average
*October 21, 2014*

**physics**

A ball is moving horizontally at 9 m/s when it leaves the edge of a table. The table is 1.64 m high. How long does it take to hit the ground?
*October 21, 2014*

**math**

manuel says that you can use one of the denominators of 5/6 and 11/30 when renaming these fraction using a common denominator. why is this true
*October 21, 2014*

**math**

Andrew wants to rename 2/7 and 3/4 using a common denominator. which of the following shows these fractions renamed correctly. a 8/28 and 21/28 b 2/28 and 3/28 c 4/28 and 6/28 d 2/7 and 3/7
*October 21, 2014*

**Physics**

A constant force, F = (4.63, −3.79, 2.16) N, acts on an object of mass 17.7 kg, causing a displacement of that object by r = (4.10, 3.86, −2.45) m. What is the total work done by this force? Im pretty sure the work equals -k(x-xo) but im not really sure what the ...
*October 21, 2014*

**English**

Lost on this one. Is demanding in this sentence a verbal gerund or just a verb? He is always demanding to have his own way. I want to say a verbal gerund, but then I want to say verb
*October 21, 2014*

**Physics**

What is the kinetic energy of an ideal projectile of mass 19.4 kg at the apex (highest point) of its trajectory, if it was launched with an initial speed of 29.2 m/s and at an initial angle of 46.9° with respect to the horizontal? I know kinetic energy equals half of mass ...
*October 21, 2014*

**math**

train A arrives at central station on the hour and every 12 minutes. train B arrives on the hour and every 15 minutes. when do both train arrives at the same time.
*October 21, 2014*

**English**

In following sentence is Knowing a verbal participle or a verbal gerund? Knowing how an engine works is the key to auto repair. I want to say gerund because I say it is the subject.
*October 21, 2014*

**Physics**

A mass of 2.63 kg is attached to a string tied to a hook in the ceiling. The length of the string, L, is 0.8 m, and the mass is released from rest at an initial position in which the string makes an angle θ of 40.4o with the vertical. Calculate the work (in J) done by ...
*October 21, 2014*

**math**

a punch recipe calls for equal amounts of pineapple juice and orange juice. pineapple juice comes in 6- ounce cans and orange juice comes in 10 ounce cans. what is the least amount of each kind of juice that can be mixed without having any left over
*October 21, 2014*

**statistics**

A researcher is interested in determining whether acupuncture affects pain tolerance. An experiment is performed in which 15 students are randomly chosen from a large pool of university undergraduate volunteers. Each subject serves in two conditions. In both conditions, each ...
*October 21, 2014*

**Math HELP!**

Which statement is true? A. Every real number is an integer. B. Every rational number is a real number. C. Every rational number is a perfect square. D. Every integer is an irrational. Is the answer A?
*October 21, 2014*

**algebra**

The equation y = 14x represents the number of pages Printer A can print over time, where y is the number of pages and x is time in minutes. The table shows the number of pages Printer B can print over time.
*October 21, 2014*

**Math HELP!**

When a skydiver jumps from an airplane, the distance d in feet the diver falls in t seconds before opening the parachute is given by the formula d=16t^2. The formula assumes that there is no air resistance. Find the time it takes a skydiver to fall 1,551 ft before opening the ...
*October 21, 2014*

**Math HELP!**

The formula v= square root 64h can be used to find the velocity, v, in feet per second, of an object that has fallen h feet. Find the velocity of an object that has fallen 75 feet. Round to the nearest tenth. A. 6.9 ft/s B. 69.2 ft/s C. 69.4 ft/s D. 69.3 ft/s Is the answer D?
*October 21, 2014*

**Math**

-k = 10 + 3x^3 - 6x - 7x^5 - x^2 - 2x^4 Is this k = 7x^5 + 2x^4 - 3x^3 + 6x - 10?
*October 21, 2014*

**math**

give 3 solutions of the inequality 5x-2>7 I'm confused. will I have 3 same answers, but have to work the problem 3 different ways, or will there be 3 different answers?
*October 21, 2014*

**Math HELP!**

Thank you :)
*October 21, 2014*

**Math HELP!**

An estimate for -square root 72 is? A. -8.1 B. -8.5 C. -9.1 D. -9.5 Is the answer A? Thanks
*October 21, 2014*

**physics**

Under what circumstances, if any, will a converging lens form an inverted image of a real object? Under what circumstances, by itself, will a diverging lens form an erect image of a real object?
*October 21, 2014*

**Math HELP!**

Thank you both :)
*October 21, 2014*

**Math HELP!**

C is the right answer or A?
*October 21, 2014*

**Math HELP!**

maybe C?
*October 21, 2014*

**Math HELP!**

As estimate for square root 47 is between? A. 4 and 5 B. 5 and 6 C. 6 and 7 D. 7 and 8 Is the answer A? Thanks
*October 21, 2014*

**Math**

Thank you
*October 21, 2014*

**Math**

Joy knits a square blanket that has an area of 1,500 square inches. What is the approximate length of each side of the blanket? A. 16 inches B. 27 inches C. 39 inches D. 42 inches Is the answer C? Thank you
*October 21, 2014*

**Math HELP!**

Thank you Ms. Sue! :)
*October 21, 2014*

**Math HELP!**

Sorry I meant to put D.
*October 21, 2014*

**Math HELP!**

Rosa, Roberto, Andrea, and Inno find an estimate for square root 10. Who has proposed the best solution? A. Rosa: "Use square root 9 and square root 25 to estimate." B. Roberto: "I will use square root 4 and square root 9." C. Andrea: "It should be ...
*October 21, 2014*

**Algebra: Answer Check**

(2 - 7i) - (5 - 3i) = -3 - 4i (1 + 2i) + (3 + 4i) = 4 + 6i
*October 21, 2014*

**math**

What is the perimeter of a triangle with the given side lengths? s1 = x + 4 cm s2 = 3x + 1 cm s3 = 7x + 3 cm
*October 21, 2014*

**Chemistry **

Predict and draw the structure of the product of the reaction of the following substrates with the given reducing agent. 2-hexanone mixed with hexanoic acid with (i) NaBH4 (ii) LiAlH4
*October 21, 2014*

**algebra**

One integer is 3 less than 4 times another. Their product is 27. Find the integers.
*October 20, 2014*

**physics**

what is the work with a force of 19.3 N and a displacement 7 m and an angle of 80.0
*October 20, 2014*

**Pre-Calc**

You are taking a road trip in a car without A/C. The temperture in the car is 93 degrees F. You buy a cold pop at a gas station. Its initial temperature is 45 degrees F. The pop's temperature reaches 60 degrees F after 23 minutes. Given that \frac{T-A}{T_0 - A} = e^{-kt} ...
*October 20, 2014*

**chemistry**

use kelvin, not celsius
*October 20, 2014*

**math**

Jordan is making a beaded necklace, 2/3 of the beads she uses are red and 4/21 of the beads are blue, she wants the rest to be white, what fraction of the beads should be white?
*October 20, 2014*

**Math HELP!**

An estimate for -square root 66 is (blank) A. -6 B. -7 C. -8 D. -9 Is the answer C? Thank You
*October 20, 2014*

**Art**

What is an artwork source, because I dont know what to put in that field. Is it where I got the my idea from in my drawing, if so would a book where I got my idea be ok? Thank you
*October 20, 2014*

**Math HELP!**

Ok thank you, I just redid it and I can see that C is the answer.
*October 20, 2014*

**Math HELP!**

Then what do I pick, A?
*October 20, 2014*

**Math HELP!**

So the answer is A for the square root of 5
*October 20, 2014*

**Math HELP!**

Which two square roots are used to estimate square root 5? A. Square root 1 and square root 2. B. Square root 2 and square root 4. C. Square root 4 and square root 9. D. Square root 9 and square root 16. Is the answer B? Thanks
*October 20, 2014*

**Algebra 2**

0=x^3 - 27x You can factor out an x on right hand side 0= x(x^2-27) X=0 X=-sqrt(27) X=sqrt(27)
*October 20, 2014*

**geometry**

Find the dimensions of a rectangle if the area is 1500 ft to the 2nd power
*October 20, 2014*

**government**

why?
*October 20, 2014*

**government**

How doe Congress protect the rights of authors and inventors?
*October 20, 2014*

**calculus**

So I can just use the point-slope formula to solve equations like this?
*October 20, 2014*

**government**

What is the impeachment power of the House?
*October 20, 2014*

**jh**

why do you help children?
*October 20, 2014*

**Chemistry**

An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...
*October 20, 2014*

**physics**

A centrifugal pump pumps 100 lbs/hr of water 100 ft high to the top nozzle of a distillation column. The pump impeller is 3 ft diameter?
*October 20, 2014*

**French**

What are some phrases a teacher can use to introduce himself/herself in French?
*October 20, 2014*

**Algebra**

I need help explaining how to work this problem for my daughter... What is the value of n so that the expression x² + 11x + n is a perfect square trinomial? 11 25 30.25 I know this is the answer but how 36
*October 20, 2014*

**Algebra: Answer Check**

1. (4i) + (2 + 8i) = 2 + 12i 2. 6i + 4i = 10i
*October 20, 2014*

**chemistry**

i figured this one out
*October 20, 2014*

**English**

Studying verbs and participles. Am I right to say falling is a verb in following sentence? The snow had been falling all night. Trying to learn and think I am pretty sure a verb, LOL!
*October 20, 2014*

**science**

1. radioactive decay occurs when atoms A- lose mass B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would ...
*October 20, 2014*

**Spanish **

How do I say "I used to roller skate, jump rope, and ride my tricycle" in spanish?
*October 20, 2014*

**science**

How to do an outline investigation plan?
*October 20, 2014*

**Jay**

Please help me to solve this problem. Thank you in advance for helping to solve this problem. Have a great day. Here is the question? Use the point-slope form to write the given slope and point. Leave the equation in that form: slope 7/8, passes through (-2,-9)
*October 20, 2014*

**French**

La photo, c'est ton truc? Does photo here mean photo in English or photography?
*October 20, 2014*

**SS**

Is Ottawa valley an actual valley?
*October 19, 2014*

**Math**

an ice cream cone contains one spherical scoop of ice cream,the diameter of the scoop of ice cream is the same as the diameter of the cone. If the ice cream melts, will the cone overflow? Justify your answer. 4cm spherical scoop of ice cream diameter of cone- 7cm
*October 19, 2014*

**Math**

Examine the given right angle triangle. Are the side lengths given in the diagram possible? Justify your answer. lengths: 2.4m, 9.2m, 4.7m
*October 19, 2014*

**Math/Science**

Three bullets are fired simultaneously by three guns aimed toward the center of a circle where the bullets mash into a stationary lump. The angle between the guns is 120°. Two of the bullets have a mass of 9.30 10-3 kg and are fired with a speed of 440 m/s. The third ...
*October 19, 2014*

**math**

Find the surface area of a right rectangular pyramid with a base 10 in by 8 in and a height of 10 in. (Answer to the nearest square inch)
*October 19, 2014*

**statistics**

a researcher wants to find a model that relates square footage
*October 19, 2014*

**math**

ooooh no wonder i used the sa formula! thank you
*October 19, 2014*

**math**

A jade necklace is made up of 100 spherical jade beads. Each bead has a diameter of 7 mm. What is the total amount of jade, in cubic millimetres?
*October 19, 2014*

**math**

a post is put every 6 feet along a rectangular fence that is 42 feet long and 36 feet wide. how many posts are needed?
*October 19, 2014*

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