bex
Most popular questions and responses by bex
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?
asked on September 21, 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?
asked on September 11, 2016 
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 thinwalled spherical shell (I = ⅔mr²), and
asked on October 30, 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
asked on 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
asked on October 2, 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.
asked on September 14, 2016 
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
asked on June 3, 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?
asked on June 6, 2014 
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
asked on April 20, 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
asked on April 18, 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
asked on February 14, 2007 
algebra
A marketing department estimates that demand for a product is given by P=1000.0001x, 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=
asked on December 6, 2015 
Calculus
If y = y(x), write y’ in Leibniz notation.
asked on April 2, 2014 
chemistry
is NH2 an amine and classed as ammonia and is c=0 or NH 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.
asked on March 8, 2007 
chemisrty
hello how would i draw a monomer CH2CHCH=CH2 I have to draw three monomer units can anyone help
asked on March 15, 2007 
Physics
A 230kg 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
asked on October 12, 2016 
Calculus
What are two conditions that must be met before the Extreme Value Theorem may be applied?
asked on April 8, 2014 
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
asked on May 18, 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
asked on May 6, 2007 
chem
hi can anyone help how do i determine the molecular formular of the oxide of arsenic in its in its gaseous state the answer i got was 17.8 gl 1 for the density, which law do i use is it boyles law or charles law thanks A mol of a gas occupies 22.4 L at
asked on February 3, 2007 
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
asked on September 19, 2016 
calculus
A region is bounded in the second quadrant by the curve y = ln(1–x), the line y=3, and the yaxis. Find the area of the region.
asked on May 22, 2014 
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
asked on February 3, 2009 
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
asked on 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?
asked on November 27, 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.
asked on March 13, 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
asked on March 12, 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
asked on February 4, 2007 
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
asked on October 12, 2016 
Physics
A box slides down an inclined plane with an acceleration that is precisely twothirds 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
asked on September 28, 2016 
Calculus
If g(x) = a f(x); find g’(x). Is it g'(x)=af?
asked on April 2, 2014 
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
asked on November 26, 2007 
maths equations
could you please help me on this equation r = sx2/2t im really stuck Your nonuse 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=
asked on May 13, 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=96y. Divide each side by 3.Giving x=(96y)/3. Divide
asked on May 6, 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
asked on April 19, 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
asked on April 12, 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
asked on April 4, 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
asked on February 27, 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
asked on February 14, 2007 
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
asked on September 25, 2016 
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?
asked on June 6, 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
asked on May 22, 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
asked on April 30, 2014 
geography
how has the geography and history of the South helped create a diverse population that continues to grow?
asked on February 17, 2010 
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
asked on 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
asked on 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.
asked on April 20, 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
asked on April 18, 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
asked on March 25, 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 ???
asked on March 20, 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
asked on March 2, 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.
asked on 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
asked on February 26, 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
asked on 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
asked on 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
asked on February 17, 2007 
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.
asked on May 20, 2014 
Calculus
What is the endbehavior asymptote for f(x)=(x^2+4x5)/(x2) ? There is an oblique asymptote at y=x+6 and a vertical asymptote at x=2. Is one of those the endbehavior asymptote?
asked on April 8, 2014 
Calculus
Find the polynomial endbehavior asymptote in the graph of f(x)=(2x^3 +6x1)/(x+2)
asked on April 4, 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?
asked on May 6, 2012 
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
asked on September 25, 2009 
business
why must stock control be closely monitered ?
asked on October 6, 2008 
ecosystems
How are the flow of matter and the flow of energy through ecosystems different?
asked on 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.
asked on December 1, 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
asked on May 23, 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
asked on May 13, 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
asked on 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
asked on 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/Lightdependent_reaction
asked on April 5, 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
asked on 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
asked on 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
asked on 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
asked on March 22, 2007 
Biology
could you explain the meaning of the phrase glycoside c1 to c4 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
asked on 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
asked on March 15, 2007 
chemisrty
how would i draw a structual formula of the products of the complete hyrolosis of tocainide O CH3NCCHNH2 CH3 H CH IM told this is tocainide please can anybody help a distressed student the O should be over the C atom
asked on 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
asked on March 14, 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
asked on March 12, 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
asked on 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?
asked on February 27, 2007 
chemistry
What evidence supports classifying H2SeO3 as an acid? In a water solution, it turns blue litmus red.
asked on February 27, 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.
asked on 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
asked on 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
asked on February 18, 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
asked on February 17, 2007 
chem
could anyone tell me why the molecular formula of agas is not always the same as the empirical formula tnx It may be a dimer or a trimer. For example, CH is the empirical formula for acetylene but the molecular formula is HC(triple bond)CH or C2H2.
asked on February 3, 2007

Science
I need help too!! Whats the answer????
posted on October 12, 2017 
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
posted on January 28, 2016 
Math
No prob
posted on January 28, 2016 
Math
Move the decimal point to the left twice and you have a correct percent
posted on January 28, 2016 
Calculus
I meant W=10, L=20
posted on June 6, 2014 
Calculus
it approaches positive and negative infinity?
posted on April 8, 2014 
Calculus
is it y=2x^2 4x+14 ?
posted on April 4, 2014 
*Science*
i wld keep it as " meteorite" (sorry for the confusion)
posted on February 17, 2010 
*Science*
which definition?
posted on February 17, 2010 
Geography
i think its C...but i cld be wrong
posted on 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
posted on February 17, 2010 
science
its called weathering  we just did it in science. you get 3 types: biological, physical and chemical weathering.
posted on September 30, 2009 
Physics
oh, okay, hank you so much!
posted on February 3, 2009 
Physics
Please, please, I really need gelp for this.
posted on February 3, 2009