Sunday

February 19, 2017
Total # Posts: 104

**Physics**

A tennis ball, starting from rest at a height h = 2.10 m, rolls down the hill. At the end of the hill the ball becomes airborne, leaving at an angle of 27.0° with respect to the ground. Treat the ball as a thin-walled spherical shell (I = ⅔mr²), and determine ...

*October 30, 2016*

**Physics**

A 230-kg roller coaster reaches the top of the steepest hill with a speed of 5.20 km/h. It then descends the hill, which is at an angle of 25° and is 50.0 m long. What will its kinetic energy be when it reaches the bottom? Assume µk = 0.16 I'm not sure how to set...

*October 12, 2016*

**Physics**

A record was set for stair climbing when a man ran up the 2100 steps of the Empire State Building in 15 minutes and 10 seconds. If the height gain of each step was 0.2 m, and the man's mass was 73.0 kg, what was his average power output during the climb I'm not sure ...

*October 12, 2016*

**Physics**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 2.15 × 104 m/s (Va) and the radius of the orbit is 5.15 × 106 m (ra). A second satellite also has a circular orbit around this same planet. The orbit of this second satellite ...

*October 5, 2016*

**Physics**

The passengers in a roller coaster car feel 1.60 times heavier than their true weight as the car goes through a dip with a 24.0 m radius of curvature. What is the car's speed at the bottom of the dip? Which equation do I use? V= 2(pi)r/t = 2(pi)rtf = wr

*October 2, 2016*

**Physics**

A box slides down an inclined plane with an acceleration that is precisely two-thirds what it would have been if the slide had been frictionless. Calculate the angle of the incline if the coefficient of kinetic friction of the rough incline is 0.29 I know I have to use ...

*September 28, 2016*

**Physics**

A mass (m1) is connected by a light string that passes over a massless frictionless pulley to a mass (m2) sliding on a horizontal surface. The coefficient of kinetic friction between the m2 and the surface is 0.25. If m1=1.0kg and m2=2.0kg then what is the acceleration of the ...

*September 25, 2016*

**Physics**

At a track and field meet, the best long jump is measured as 8.30 m. The jumper took off at an angle of 31 ° to the horizontal. What was the jumper’s initial speed?

*September 21, 2016*

**Physics**

A ball thrown horizontally from a point 26.0 m above the ground strikes the ground after travelling a horizontal distance of 23.0 m. With what speed was it thrown? Which equation should I use? V= DeltaX / Delta T A= Delta V / Delta T Horizontal motion where X= Xo + Vx(T)

*September 19, 2016*

**Physics**

A ball is thrown vertically upward from the edge of a bridge 26.5 m high with an initial speed of 11.0 m/s. The ball falls all the way down and strikes the water below. Determine the magnitude of the velocity of the stone just before it strike the water. (In m/s)

*September 14, 2016*

**Physics**

A photographer in a helicopter ascending vertically at a constant rate of 1.3 m/s accidentally drops a camera out the window when the helicopter is 40.0 m above the ground. How long will it take the camera to reach the ground? Which equation should I use? a) Y=Yo + Vo(t) + (1/...

*September 11, 2016*

**Math**

No prob

*January 28, 2016*

**Math**

Move the decimal point to the left twice and you have a correct percent

*January 28, 2016*

**U.S. Gov. & Ec.**

Thanks, I love the band lol and idk it just doesn't seem right...can you prove that I'm wrong? Because I really need help

*January 28, 2016*

**algebra**

A marketing department estimates that demand for a product is given by P=100-0.0001x, where P is price per unit and X is number of units. The cost C of producing x units is given by C=350,000+25x And the profit P for producing x units is given by P= R-C=xp=C. Sketch the graph ...

*December 6, 2015*

**Calculus**

I meant W=10, L=20

*June 6, 2014*

**Calculus**

Given the area of a rectangle is A = LW. If three sides of the rectangle are fixed, I.e. 2W + L = 40, find L and W such that you maximize the area of the rectangle. Is it L=10, W=20?

*June 6, 2014*

**Calculus**

A square with side x cm, is changing with time where x(t) = 3t + 1. What is the rate of change of the area of the square when t = 2 seconds?

*June 6, 2014*

**Calculus**

A rectangular box has a square base whose edge has length at least one centimeter, and its total surface area is 600 cm2. What is the largest possible volume that such a box can have? V = 500 in3 V = 750 in3 V = 900 in3 V = 1,000 in3

*June 3, 2014*

**calculus**

A region is bounded in the second quadrant by the curve y = ln(1–x), the line y=3, and the y-axis. Find the area of the region.

*May 22, 2014*

**Calculus**

Jill burns 100 calories per hour while sleep and 300 calories per hour while walking and 200 calories per hour at work. If in a typical day Jill spends 7 hours sleeping, 2 hours walking and 6 hours working, what is her average calories burned for those hours? 166.67 cal/hr 200...

*May 22, 2014*

**Calculus**

Evaluate the integral of 4x^2(2+x^3)^9 dx. I'm supposed to use the substitution rule but I have absolutely no idea where to start with this problem.

*May 20, 2014*

**AP Literature**

Identify the figure of speech in this sentence: "Anyone who calls a spade a spade should be compelled to use one." --Oscar Wilde Simile Metaphor Personification Analogy Hyperbole None of these I'm torn between personification and none of these, however I'm ...

*April 30, 2014*

**Calculus**

What are two conditions that must be met before the Extreme Value Theorem may be applied?

*April 8, 2014*

**Calculus**

it approaches positive and negative infinity?

*April 8, 2014*

**Calculus**

What is the end-behavior asymptote for f(x)=(x^2+4x-5)/(x-2) ? There is an oblique asymptote at y=x+6 and a vertical asymptote at x=2. Is one of those the end-behavior asymptote?

*April 8, 2014*

**Calculus**

is it y=2x^2 -4x+14 ?

*April 4, 2014*

**Calculus**

Find the polynomial end-behavior asymptote in the graph of f(x)=(2x^3 +6x-1)/(x+2)

*April 4, 2014*

**Calculus**

If y = y(x), write y’ in Leibniz notation.

*April 2, 2014*

**Calculus**

If g(x) = a f(x); find g’(x). Is it g'(x)=af?

*April 2, 2014*

**Math**

Sarah has an 86% average on her 1st 5 tests. If she gets a 92 on her next test, what will her average be then?

*May 6, 2012*

***Science***

i wld keep it as " meteorite" (sorry for the confusion)

*February 17, 2010*

***Science***

which definition?

*February 17, 2010*

***Science***

a meteorite is a stony or metallic object that is the remains of a meteoroid that has reached the earth's surface

*February 17, 2010*

**geography**

how has the geography and history of the South helped create a diverse population that continues to grow?

*February 17, 2010*

**Geography**

i think its C...but i cld be wrong

*January 11, 2010*

**science**

its called weathering - we just did it in science. you get 3 types: biological, physical and chemical weathering.

*September 29, 2009*

**English**

How does Arthur Miller manage to create tension in Act Two of ''A View From The Bridge''? d how does act two reflect all the main themes in the play? I'm terrible at writing essays and I really need help! i'm not asking you to write it for me, just a ...

*September 25, 2009*

**Physics**

oh, okay, hank you so much!

*February 3, 2009*

**Physics - urgent**

Please, please, I really need gelp for this.

*February 3, 2009*

**Physics**

a bowling ball is thrown down from the top of a building at 20 m/s. Find the distance the ball travels in A) 1 s B) 3 s should I make the 20 m/s negative? I'm assuming the ball is just being thrown stright down... I'm using the formula d=V(initial)*t+1/2a*t^2 I'm ...

*February 3, 2009*

**business**

why must stock control be closely monitered ?

*October 6, 2008*

**Algebra 2 honors**

sorry.im not very good at algebra =[

*September 10, 2008*

**Algebra 1 honors**

.09x+.08x(30)= $1380 + $6400 = ? ......i think/hope that this is right....

*September 10, 2008*

**ecosystems**

please help me!

*September 10, 2008*

**ecosystems**

How are the flow of matter and the flow of energy through ecosystems different?

*September 10, 2008*

**math**

suppose x S f(t) dt= x^2 - 2x + 1. Find f(x). 1 S = integral and 1 = lower level, x = upper i don't understand what i'm supposed to find/what to do and i didn't make any typos.

*December 1, 2007*

**calculus**

suppose x S f(t) dt= x^2 - 2x + 1. Find f(x). 1 S = integral and 1 = lower level, x = upper i don't understand what i'm supposed to find/what to do

*November 30, 2007*

**physics**

a 70 kg rope climber starts from rest, moves with constant acceleration, and climbs 9 meters up a rope having a maximum strength of 840 N. What is the greatest possible speed she can have afte climbing 9m?

*November 27, 2007*

**history**

i don't get this quote. can someone please explain? who is they? "there is also the difference between merchants barely tolerated by a centralized empire and those whose rulers and governments used them for their imperial cause... they could, in terms of ...

*November 26, 2007*

**earth clay**

could you tell me how clay plays a cruial part in the origin of life This site should help you: http://en.wikipedia.org/wiki/Origin_of_life#Clay_theory

*May 23, 2007*

**science**

could someone please help me i have to write about the start of life on a extrasolar planet and talk about chemical evolution,, could someone please give me some pointers Is this S103 ECA? yes it is im just need some pointers so that i can do the work in my own words but i don...

*May 18, 2007*

**maths equations**

could you please help me on this equation r = sx2/2t im really stuck Your non-use of parenthesis makes in difficult to know what the equation is. What are you trying to do with the equation? sorry im trying to make x the subject divide each side by s r/s= x^2 /2t multiply each...

*May 13, 2007*

**solar science**

could you give me any ideas on the stages of chemical evolution that would need to occur towards the development of life and the timescales many thanks http://en.wikipedia.org/wiki/Origin_of_life http://www.google.com/search?as_q=&hl=en&num=10&btnG=Google+Search&as_epq=origin+...

*May 13, 2007*

**chem equations**

could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is 2CH4+2NH3+3O2--&...

*May 6, 2007*

**science**

could someone please crique this algebra x must be the subject 6y = 9 - 3x 3x = 6y + 9 x = 2y + 3 is this correct please Add 3x to each side.Giving 6y+3x=9. Subtract 6y from each side.Giving 3x=9-6y. Divide each side by 3.Giving x=(9-6y)/3. Divide numerator by 3. Giving x=3-2y.

*May 6, 2007*

**science geo**

I have to write a brief geological history of a region starting with the oldest events schist being the earlisest and then i have sandstone and gabbro, could you see if what i have wrote is correct The schist would have probably originally been deposited first as a layer of ...

*April 20, 2007*

**geo/science**

I have to write a brief geological history of a region starting with the oldest events with schist being the oldest it says i should not speculate but concentrate on the evidence have what i wrote on the right lines if not can you give me some pointers The schist would have ...

*April 20, 2007*

**geo/science**

is sandstone a sedimentary rock that consists of minerals of quartz and feldspar, does it have any other minerals. I believe it is formed by layers of sand accumulated resulting in sedimentation because the sandstone is formed when compacted under pressure. it is foliated and ...

*April 20, 2007*

**geo/science**

could you please tell me if schist is a sedimentary rock or metamorphic. Is it formed by high temperature and high pressure. I have to draw a sketch of schist would you be able to suggest a web page that shows a sketch Yes it is metamorphic.

*April 20, 2007*

**geo/science**

could you please tell me if this is the correct formula for radiometric date t=1/constant 1n (1+d/p) many thanks ps this is a fantastic website I think that you are after t=1/ë[ln(1+D/P)] where: t = age of the sample D = number of atoms of the daughter isotope in the ...

*April 19, 2007*

**geology / science**

would you be able to suggest a good website for me to answer this question granite is intrusive , felsic rock, which may be produced by partial melting or fractional crystallization, Explain how these processes produce felsic magmas from more mafic parent magmas (200 words) ...

*April 18, 2007*

**geology / science**

the age of granite can be determind using radiometric dating, explain the basis for the determination of a 238 U- Pb radiometric date of 1120 Ma for a granite. I have as the answer 238 U decays to Pb with an experimental law, that is the amount of U and Pb in granite are ...

*April 18, 2007*

**Biology help**

please can someone help i need to know the difference at telophase 2 of meiosis if their had been a crossing over at a postision halfway between the huntingtons disease genes please im finding this last question hard

*April 12, 2007*

**Biology help**

can anybody please tell me if the diagram to show anaphase 1 is a cell with the 4 genes at the top and 4 genes at the bottom, im struggling with this as there are many diagrams to choose but is this one correct mant thanks

*April 12, 2007*

**biology**

can anybody tell me what is meant by the term regulating mortality factor and how it can lead to successful biological control of pest in agriculture HI, I am doing tma 7 aswell. if you send ur email i'll send my answer to you. do you know the answer to question 3? Thanks ...

*April 10, 2007*

**Biology**

how does the structure of green cell organelles relate to the metabolic process of photosynthesis and aerocic respiration many thanks http://en.wikipedia.org/wiki/Chloroplast http://en.wikipedia.org/wiki/Light-dependent_reaction http://en.wikipedia.org/wiki/Calvin_cycle

*April 5, 2007*

**Biology**

I am given the structual formula for lactose howere i have to write out the equation for the hydrolosis of lactose is the following what is required C12H22O11 +H2O>>> C6H12O6 +C6H12O6 all the numbers are subscript, would appreciate if someone would guide me Since this...

*April 4, 2007*

**biology**

is anyone able to help i have to write 700 words on the subject of the metabolism of green plant cells in relation to energy exchange processes any guidance would be very much appreciated http://en.wikipedia.org/wiki/Photosynthesis http://en.wikipedia.org/wiki/Calvin-...

*April 3, 2007*

**biology holly leaf miner**

can anyone please explain the term regulating mortality factor (regarding the holly leaf miner )and how understanding of this can lead to successful biological control of pests in agriculture and horticulture

*April 3, 2007*

**Biology**

A mutation of c to t in position 3 and another of G to A in position 7 results in the production of a different sequence of ammino acids work out the new sequence and suggest why it might change the function of the new protein I get the sequence of ATAAGCTTT in Mrna AUAAGCUUU ...

*March 25, 2007*

**Biology**

The human gene for the production of lactose is on chromosome 2. The dna nucleotide sequence of a small part from the middle is 123456789 TACTCGGAA I haVeTO WRITe DOWN THE EQVIVALENT SEQUENCE FOR MRNA AND HENCE WORK out the sequence of amino acids coded in this part of the ...

*March 25, 2007*

**Biology**

Could anyone suggest a web site where i could get the structual formulae and the equation for the hydrolosis of lactose thanks

*March 22, 2007*

**Biology**

Could somebody check this formula for the structure of hyroloysis of lactose C12H22O11+H20 ...> C6H12O6H12O6 OBVIOUSLY THE FIGURES ARE ALL SUBSCRIPT Many thanks Is that not the molecular formulae ???

*March 20, 2007*

**Biology**

could you explain the meaning of the phrase glycoside c-1 to c-4 linkage this is in regard to the structural formula of lactose many thanks http://en.wikipedia.org/wiki/Lactose thanks that was a real great help now i understand

*March 20, 2007*

**chemisrty**

Is this the stuctual formula for hydolosis of tocainide CH3 NHCOCH^2N(C^2H^3)^2 CH3 WITH THE HEXAGON LINKING THE 2 X CH3

*March 15, 2007*

**chemisrty**

how would i draw a structual formula of the products of the complete hyrolosis of tocainide O CH3-N-C-CH-NH2 CH3 H CH IM told this is tocainide please can anybody help a distressed student the O should be over the C atom

*March 15, 2007*

**chemisrty**

hello how would i draw a monomer CH2-CHCH=CH2 I have to draw three monomer units can anyone help

*March 15, 2007*

**chemisrty**

can anybody explain why and how a copper based catalyst helps in methonal production and the impact it would have on mass production many thanks A catalyst lowers the activitation energy needed for a reaction and allows reactants to produce more products at a lower temperature...

*March 14, 2007*

**gemma**

re s103 please could you help me on that question about methonal please please help im running out of time What question? Do you mean methanol? Please post your questions with the subject appropriately labeled, and not addressed to one person.

*March 13, 2007*

**chemisrty**

Could anybody help me with this question "In practice the methanol production process is operated at temperatures of 250 to 300 degrees and at a pressure of 50 to 100 atmosphere (50 to 100 times normal atmospheric pressure) in the presence of a copper based catalyst ...

*March 12, 2007*

**chemisrty**

I have seen on the chemistry answers that a symbol is used please can you tell me what it means they are the upside v eg Na^ and CN^ It means that the number or symbol that follows is placed in the top corner of Symbol before it E.g cm^3 or CN^- you just cant write them on ...

*March 12, 2007*

**chemistry**

is NH2 an amine and classed as ammonia and is c=0 or N-H an amide any help would be appreciated http://www.onelook.com/?w=amide&ls=a RNH2 is basic and acts much like ammonia. The -CONH2 group is an amide.

*March 8, 2007*

**chemisrty**

please could you tell me how i would draw an hydrogen atom which has only one electron and describe why it has so many spectral lines, I have studied my text books but cant seem to figure it out, many thanks in advance http://images.google.com/images?&hl=en&num=10&btnG=Google+...

*March 2, 2007*

**Dr Bob222**

Can you help me with this please - Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas at a different temp? & at a different pressure? You can do this two ways. The simplest is P1V2/T1 = P2V2/T2

*February 27, 2007*

**chemistry**

I have a chemical composition of As2O3. How do I calculate the mass of oxygen that combines with 1 mol of arsenic to form the oxide of arsenic? How do I use this to obtain the empirical formula of the oxide? That IS the empirical formula of the compound. You calculated the ...

*February 27, 2007*

**chemistry**

If the arsenic is 76% and oxygen is 24% how would I calculate the chemical composition of of the oc=xide of arsenic that has been formed? Divide 76 by the atomic weight of As (which is 74.92) and 24 by the atomic weight of O (which is 16.00). The two new numbers that you get ...

*February 27, 2007*

**chemistry**

Temp - 650 Pressure - 690mm Hg mass - 0.927g volume - 194cm3 How do I calculate the volume of the gas? You have the volume, given. How do I calculate the volume at a different temperature?

*February 27, 2007*

**chemistry**

What evidence supports classifying H2SeO3 as an acid? In a water solution, it turns blue litmus red.

*February 27, 2007*

**chemistry**

I have a compound ch3 = ch- ch - oh ch3 the ch3 is under the first ch from the left, i have to identify the monomer unit and draw a structure showing three monomer unit any help i have a compound CH3= CH - CH - OH and another CH3 under the first CH from the left , I have to ...

*February 26, 2007*

**chemistry**

What is polymerization and what type is involved in forming a polymer when I have CH3 N CH O C and NH3 Can any one help please Polymerization is the chaining of monometers. Look for the double bond, it breaks, and forms a chain.

*February 25, 2007*

**chemistry**

the diagram below shows a structural formulae of 3 cabon compounds labelled 1 2 and 3 and the eaction between compounds 1 and 2. The equation for this reaction is incomplete only the reactants are shown, the missing products being indicatedby a? :o ch2 =ch-ch -oh + ch3 - ch - ...

*February 19, 2007*

**chemistry**

are the noble gases of NCCN cyanogen = Argon HCN hydrogen cyanide = Neon thanks I don't know how to answer this. There are 10 electrons, all bonding electrons in HCN. In the case of F, for example, we say its ion is isoelectronic with Ne; i.e., there are 10 total electrons...

*February 18, 2007*

**physics**

is this the strutual formula for hydrogen cyanide H:C:::N and is this correct for cyanogen :N:::C:C:::N any advice woulds be appreciated This is more chemistry than physics. It is important to put the subject line carefully in order for the right people to look at the problem...

*February 18, 2007*

**chemisrty**

if i am trying to find the diameter of an oil molecule and express my answer in scientific notation. the info is drop of oil 0.05 cm3 from a dropper spreads out to 40 cm2 is it vol = l x w x h 0.05cm3 = 20 x 20 xh 0.05 cm3 = 40cm2 after this im stuck as i don't know what ...

*February 17, 2007*

**chemisrty**

which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic num 88 and mass num 226 how do i go about this please can you help If you can add you can do these. 88Ra226 ==>2X4 + zzYww. Now make the numbers add. Protons must be conserved. ...

*February 17, 2007*

**bock 7 s103**

is there anybody out there who have looked at tma 06 yet if you have could we pick each others brains lol thanks I looked up tma 06 on google and found many site regarding religion which certainly is not my field. Please clarify your question, if you still have one. If it is ...

*February 17, 2007*

**atoms**

If i was to draw a diagram of a hydrogenatom with one electron and its many spectral lines would i need to draw the BOhr model with the nucleus in the middle and 3 outer rings or have i lost the plot That is one way. Actually, there are an infinite number of stable orbits that...

*February 14, 2007*

**physics**

a drop of oil vol 0.05 cm3 is released from a medicicne dropper on to a calm surface pond where it spreads out to cover an area of 40 cm 3. Assume oil film is uniform thickness equal to diameter of oil molecule. Calculate the diameter of oil molecule and express in scientific ...

*February 14, 2007*

**chemisrty**

can anybody give me the density of arsenic oxide at STP is this the correct formula volume = mass/ density thanks Yes, but if you want the density, it is density = mass/volume. The number I have seen floating around on this board is 17.8 g/L but the density of a gas and the ...

*February 4, 2007*