Friday

April 18, 2014

April 18, 2014

Total # Posts: 317

**Physics**

You design a roller coaster that has an initial drop from some height "h" followed by a loop and then the ride comes to a stop. If the loop of a circle with a diameter of 50 m, what is the minimum height you would need to make sure nobody falls out? (Ignore friction)

**Algebra 2 word problem**

just checking to see if i have this problem correct Sammy can cut wood twice as fast as Joe. When they both work together, it takes them 4 hrs. how long would it take them to do the job alone? 4/x +4/x+2 = x^2+2 4x+4x+8= x^2+2 8x+8= x^2+2 x^2-6x-8=0 (x-4)(x+2) x=4 x=-2 since i...

**checking to see if this is right**

just checking to see if i have this problem correct Sammy can cut wood twice as fast as Joe. When they both work together, it takes them 4 hrs. how long would it take them to do the job alone? 4/x +4/x+2 = x^2+2 4x+4x+8= x^2+2 8x+8= x^2+2 x^2-6x-8=0 (x-4)(x+2) x=4 x=-2 since i...

**Algebra 2 word problem**

Just wanted to check to see if these are correct. Thank you, Please check if a greyhound bus travels 7mph slower than the express bus. the express bus travels 45 miles in the time it takes the greyhound bus to travel 38 miles. find the speed of each bus greyhound 38/x-7 expres...

**biology**

what forms between the other two primary tissue layers

**Algebra 2**

Just checking to see if I got this right. Thanks, (3x^4--8x^2 -3x-3) / (x^2-3) 3x^2+1 remainder -3x

**Organic Chemistry**

what is the major product if 2,3,3-trimethylpentane was mixed with IBr?

**Algebra 2**

Just checking to see if I got this right. Thanks, (3x^4--8x^2 -3x-3) / (x^2-3) 3x^2+1 remainder -3x

**Algebra 2**

I am totally lost! (3x^4--8x^2 -3x-3) / (x^2-3)

**Algebra 2**

I have been trying to figure this problem out and I am completely lost. Could someone help guide me through it? (3x^4-0x^3-8x^2 -3x-3) / (x^2-3)

**Physics**

Which of the following is true? a. Conserved forces cannot do work b. Work can be performed on an object without moving it c. If the work is done by a conserved force, you do not need to know the path the object took d. To know the total work performed on an object you must al...

**Physics**

Suppose the Earth was only half the size it is now (half the mass and half the radius), what would "g" be?

**Physics**

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a weight of 10 lbs on earth, what is its weight on Mongo?

**Physics**

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a mass of 10 kg on earth, what is its mass on Mongo?

**Physics**

The gravitational force between two objects is proportional to what

**Physics**

A 5 kg block is being pulled to the right by a rope which is attached to a dangling 2 kg mass. The coefficient of kinetic friction between the mass & table is 0.1 What is the tension in the rope?

**Physics**

A block is sitting on a ramp. The block feels a force of friction sufficient to keep it from sliding down the ramp, which makes an angle of 30 degrees w.r.t. horizontal. What is the minimum coefficient of static friction between the block & ramp?

**Physics**

Three weights are attached to the corners of an equilateral triangle (side length 10 cm) made from stiff but very light wire. Measured from the bottom left corner, what is the center of mass of this object if M1 = 0.1 kg, M2 = 0.2 kg, and M3 = 0.3 kg?

**Physics**

A car travels around a circular track (4 km diameter). Its tires have frictional coefficients: mS = 0.3 & mK = 0.2. If the track is flat, how fast can the car travel around the track and still maintain control?

**Physics**

A lower block is being pulled to the right across a wooden table and it is 5kg and the block on top of it weighs 2 Kg. The friction between the table and the lower block is reduces the total acceleration to be 1.5 m/s2. Friction keeps the upper block attached to the lower one....

**Physics**

A 5 kg block is being pulled to the right with a 20 N force. This causes the block to slide along the table with an acceleration of 2 m/s2. What is the coefficient of kinetic friction between the block and table?

**Physics**

A 5 kg block is attached via a rope to a dangle 2kg mass. Consider the case without friction. What angle would the ramp be for the 5kg block to experience zero acceleration?

**Trig**

find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV

**Trig**

tan 75 (show all work please)

**Trig**

No it is to find the exact value of the expression using the provided information. Find Tan (S+T) given that cos s=1/3 with s in quad I and sin T= -1/2 with T in quad IV

**Trig**

find (s+t) given that cos s=1/3 with s in quad I and sin T=-1/2 with t in quad IV

**chemistry**

25.5 degrees C

**Pre algebra**

-3(4x+3)+4(6X+1)=43 Need to solve

**algebra**

How do I find a the surface area of a can that has a diameter of 4 inches and a height of 3 inches?

**Math**

Solve. 3p-1=5(p-1)-2(7-2p)

**geometry**

triangle

**geometry**

If AC = 20 centimeters, and BC = 16 centimeters, what does AB equal?

**math analysis**

how do i do cosecant x= 30/150? and how do i do cosecant x= 1500/9000

**7th Grade**

z + 5/7 = 3 z = 3 - 5/7 z= 2&2/7

**Math**

3 x 25=75 P 75 -- -- =62.5% 100 120 cross multiply. P x 120= 120P 100 x 75=7500 7500/120=62.5%

**Chemistry**

Identify an inert element that is used in electrical discharge tubes.

**English**

Choose the correct word to complete each sentence. 1. Despite wanting to pass the exam, Julia just couldn't get down to revising. She seemed to have a mental ___ about it. a. brick b. gap c. block d. space 2. When the counsellor listened to George's problems, her non-j...

**Maths - Probability**

Tickets numbered 1 to 1000 were sold in a raffle for which there was one prize. Mr Kahn bought all the tickets containing at least one '3' because '3' was his lucky number. What was the probability of Mr Kahn winning?

**2nd grade**

what is the antonym of the word smooth

**College physics**

A toddler is on a playground swing. When she is right in the middle going forward (to the right), then ... a).her tangential acceleration is maximal to the right. b) her tangential acceleration is zero. c) her tangential acceleration is maximal to the left. d) her kinetic ener...

**english**

Need ideas for a 7th grade research paper. I like gymnastics and dance. any ideas?

**accounting**

cash balance per books 6781.50

**Science**

What is the power of 1,000 newtons, 3 meters and 60 seconds?

**College Physics**

So would I divide the problem by wf?

**College Physics**

A freely rotating merry-go-round on a playground has a moment of inertia of 312 kgm2 and a radius of R=2.5 m. It is rotating with ω0=2.8 rad/s when a kid of mass 45 kg is standing on its outer rim. Neglecting friction, what is going to be the angular velocity of the merry...

**geometry**

Q is the midpoint of PR. PQ = 3x - 5 and QR = x + 17. What is the value of x?

**8th grade**

graph each realation on cordanant system

**physics**

10^14. Divide area of pinhead by area of atom

**Earth Space Science**

What type of motion would have to occur to move or displace the fixed color lines produced by a gas like helium or hydrogen toward the 400 nanometer mark on the spectrum scale?

**physics**

If you shout across a canyon and hear an echo 3.6 s later, how wide is the canyon?

**accounting**

This is not enough information. You need another number. Either the original price or a discounted price or something???

**fractions and decimals**

15/86 is the fraction then divide 15 by 86 and you get 0.1744 that would be one option for row one. I'm not sure if you can make improper fractions but if you can it could also be 86/15 as a fraction then divide 86 by 15 5.7333 repeater. I am assuming you could arrange the...

**physics**

if a super dense material with a refractive index of 1.76 x10^7 what is the speed of light in this material

**math**

Mathematically, why is a manhole cover round?

**world history**

Under whose reign did the Persian empire become the greatest military power of the ancient world?

**chemistry**

What is the formula used to solve the problem: How many milliliters of 1.171 M HCl are required to react with 7.69 grams of CaCO3 ?

**Algebra 2**

Y=2/3-1 y=-x+4

**algebra**

if u cut any size circle 5times , what is the greatest amount of pieces i can get?

**math**

hi, i am in forth grade i need to know what factors means. now for my home work. can you please respond and in a way i can under stand.

**3 grade**

what i dont get your question and your in 3rd grade and they ask you this

**Algebra II**

The answer for (7+5i)+(-4+2i) is 3+7i. But I got -38-6i. I combined -28 and 10i^2 to get -38, and I combined -20i and 14i to get -6il So all together this was -28+-6i+-10, which resulted in -38-6i. Could you please tell me where I went wrong?

**Chemistry**

What are the characteristics of a perfect flame for a bunsen burner??

**Biology**

What is the role of oxygen in aerobic respiration?

**AP World History**

How would you compare and contrast life in foraging societies with life in agricultural societies after the Agricultural Revolutions?

**health**

The answer is D. The person who creates the data in the record. It wouldn't be the patient

**biology**

why are the processes of transcription necessary for life?

**biology**

why are the processes of transcription necessary for life?

**4th grade**

what is prime and composite 13,37,25,117208,67

**Chemistry**

Calculate the volume of 0.6M HNO3 necessary to neutralize 28.55 cm3 of 0.45M KOH. please show work and detail.

**Chemistry**

What volume of 0.5M HNO3 is required to neutralize 25 cm3 of a 0.2M NaOH solution? please show work and detail.

**Chemistry-TITRATION**

A titration of 15.0 cm3 of household ammonia, NH3, required 38.57 cm3 of 0.78M HCl. Calculate the molarity of the ammonia. please show work and detail.

**Chemistry**

Determine wether the following acids are strong or weak? NOTE: all numbers in the chemical compounds below are subscripts belonging to the element before it, NOT COEFFICIENTS. a.)HCl b.)H2SO3 c.)HNO2 d.)H3PO2 e.)HNO4 f.)H2SO5 g.)HI

**math**

what relation is a doorstep to a doormat

**year 8 art**

I've got loads of art homework and there is one bit i'm struggling with i have to use a digital camera take a picture of a household object then distort the image using a graphics package on a computar in four different ways and im finding it hard to understand. Thanks

**chemistry**

What is 1.384 kg multiplied by 5.4 square meters?

**Chemistry**

A sheet of aluminum foil has a total area of 1.000 ft squared and a mass of 3.636 grams. What is the thickness of the foil in millimeters? (Density of Aluminum is 2.699 grams/cm cubed.)

**7th grade math**

How do you convert 5/16 to a decimal??

**Math**

Write the standard form of the equation of the circle with center 2,-3 and radius 4

**chemistry**

Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Indicate if the volume of NaOH is before or after the equivalence point.

**maths**

11/3058

**math**

26+4*(15-4)

**math**

4+1-2+3

**Social Studies**

What was the name of the fake government of france and who led it? Thanks so much. ^-^

**French**

I went to my caravan in the isle of wight.I went swimming i also done some jigsaws to and debbie got me some roller skates and i played on them of ages

**pre-algerbra**

-14y+12(x+y)-12x

**physics**

A student lifts a 4.7-kg box from the her desk, which is 0.9-m high, to a locker that is 4.1-m high. What is the bags energy relative to the desk?

**Physic**

What determines whether an object is a net emitter or a net absorber of radiant energy? Wood is a better insulator than glass. Yet fiberglass is commonly used as an insulator in wooden buildings. Explain.

**English**

What is the action verb and linking verb in this sentence: The day was warm and sunny.

**English**

What is the action verb and linking verb in the sentence: The day was warm and sunny.

**science**

a vascular plant

**Sociology**

i think it helps you speak better

**Science**

i need one more...

**Science**

thank you

**Science**

What are some examples of enviormental factors that may affect how tall a person grows to be?

**biology-mitosis**

what would be a factor of a cell that leads to mitosis? 4 letters. starts with s, ends in e

**biology-mitosis**

what is a structure that holds each chromosome to its exact copy? it begins with a "C", and has "d" as the second to last letter. 10 letters.

**Science project**

I need to find an object that will sink to the bottom of a glass of water, then rise to the surface within 30 seconds. I can't find that object!!

**math**

thank you

**math**

10 people are going canoeing/tubing. some people will tube, some will canoe. tubes are $7 each. canoes are $11 each. tubes hold one person. canoes hold three. if you want to spend exactly $50, how many canoes and tubes can you buy? what would be the equation for how many tubes...

**Math**

y-10 becuase it means it is 10 fewer than the amount y

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