Saturday
December 10, 2016

# Posts by selina

Total # Posts: 80

Math
The tornadoes have won 75% of their games. If they their next 4 games, their win percentage goes up to 80%. How many games have they played right now? (Please explain how to solve this problem)
July 20, 2016

physics
consider an inductive circuit suppose we want the current amplitude in a radio receiver to be 250*10^-6 A when the voltage amplitude is 3.6V at a frequency of 1.6MHz. what inductance reactance is needed?what inductance is needed?
April 4, 2016

geography
what is exsolation?
March 6, 2016

Math
Mr. Cole has \$200. He keeps 3/4 of the money for himself and divides the rest equally between his two children. How much money does each child receive?
February 18, 2016

Math
Bailey has \$105. She spends 3/7 on a new jacket and 1/5 on a new sweater. How much money does she have left?
February 18, 2016

Math
Mrs. Collin has 140 apples. She uses 2/5 of them to bake a pie and 1/4 of them to make jam. How many apples does she have left?
February 18, 2016

Math
Aaron has 120 sports cards. 3/8 of them are football cards and the rest are baseball cards. how many baseball cards does he have?
February 18, 2016

physics
but for my previous question if a sheet of mylar is placed between the plates how will the voltage across the plate and the charge density on the plate change?
February 17, 2016

physics
oh okai
February 17, 2016

physics
Three capacitors are connected to a battery of unknown voltage as shown in the circuit diagram above. The voltage drop across capacitor C 1 is V 1 = 11 . volts. a) What is the effective capacitance of the three capacitors? c) What is the voltage of the battery? d) Which ...
February 17, 2016

physics
determine the a)charge on the capacitor b)voltage across the capacitor c)current through the resistor after t=rc when a capacitor is getting charged interms of their peak values
February 17, 2016

parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on the plate
February 15, 2016

physics
parallel plate capacitor has an area of 5cm^2 and a capacitance of 3.5PF. the capacitor is connected to a 12v battery .after the capacitor is completely charge up the battery is removed. a)what must be the separation of the plates and the charge density on the plate
February 15, 2016

physics
if the mylar is removed and the plates are moved 1mm further from each other what will be the voltage across the plate and how much work will it take to move the plate apart
February 15, 2016

math
find the equation of tangent line to the graph of f(x)=xcos(√2 x) at a=0
December 27, 2015

math
okay I get it and a is as you said just to say x
December 27, 2015

math
it will be y=x but how do we know it passes through (0,0)
December 27, 2015

math
yep thanks
December 27, 2015

math
sorry the question is f(x)=xcos(√2 x) at a=0
December 27, 2015

math
find the equation of tangent line to the graph of f(x)=xcosx(√2 x) at a=0
December 27, 2015

math
can't we cancel them out
December 27, 2015

math
the second derivative of f(x)=ln(x^2+1)
December 27, 2015

math
in an arithmetic sequence whose first term is 4, the 1st, 3rd and 7th terms form consecutive terms of geometric sequence, find the sum of the first three terms of the arithmetic sequence
December 20, 2015

science
i need help with a reason for the season science lab of how earth orbits sun
February 8, 2015

history
thank you :) is there any other sites that might be helpful?
October 6, 2014

history
yes please do you know any sites that would help me? i have been stuck on this for weeks
October 6, 2014

history
The Conflict : The India-Pakistani Partition Answer the following questions about the conflict you chose: 1.Who is involved (what countries/regions)? * 2.What is the basis of the dispute? (If there are multiple disputes between these two parties, focus on one.) * 3.When did ...
October 6, 2014

Chemistry
March 23, 2014

Chemistry 151
5) How many mL of 1M HCl is used to make the following dilutions? a) 100mL of 0.1M HCl = b) 250mL of 0.5M HCl= c) 10ml of 0.01M HCl= 36.64 is the molar mass of hcl do I divide that into ml?
March 16, 2014

Chemistry
Find the molarity of 0.02g of silver nitrate dissolved in 1kg of water
March 16, 2014

Chemistry
Thank you very much for your time on this and the other problems I posted. You are appreciated. Selina Olomua
March 16, 2014

Chemistry
2) Given the balanced reaction equation predict the moles of each product given the following reactants: AlCl3 + 3 NaHCO3 Al(OH)3 + 3 NaCl + 3 CO2 AlCl3 NaHCO3 Al(OH)3 NaCl 58.4 CO2 a 1 mol 1 mol ? ? b 1 mol 3 mol ? ? c 3 mol 1 mol ? ?
March 16, 2014

Chemistry
2 NaOH + CuSO4  Na2SO4 + Cu(OH)2 100g of Cu(OH)2 is needed. Assuming 100% yield, how much of 1M NaOH and 0.5M CuSO4 must be used in mL?
March 16, 2014

Physics
A 2.2-kg baseball is pitched to you at 21 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.17 s, what is the magnitude of the average force the bat exerted on the ball? Please show all work and provide any ...
July 7, 2013

Direct way to improve yield of ball mill
The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided Grate Ball Mill and ...
June 13, 2013

The defects of ball mill
The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and ...
June 13, 2013

Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
April 27, 2013

Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.
April 27, 2013

life orientation
environmental health hazards that cause ill health,crises,and or disasters within your community or any other community within south africa and globally
April 24, 2013

collage math
f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2
December 26, 2012

Economics
Suppose that you are a bicycle producer. In 2 or 3 sentences, explain why you are willing to supply the most bicycles at the highest price. You must use your imaganation to answer this in your own words.
March 8, 2012

Art
The last one has all the right answers but 4 is c
February 20, 2012

life science
true or false? The temperature varies greatly throughout the year in a tropical rain forest.
February 8, 2012

chemistry
hey drbob222, where did u get 500ml from? question is: 1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is ...
October 14, 2011

chem
where did u get 500ml?
October 10, 2011

chem
1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is brought up to volume. What is the resulting concentration of...
October 10, 2011

physics
A particle moving with uniform acceleration in a straight line was first observed to be moving at 4.5 m/s. After 10 sec, it was moving at 6.8 m/s. What is its acceleration?
October 8, 2011

perimeter
how to draw a 15 cm and 9 cm perimeter
November 14, 2010

Chemistry
I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover: 7.5323 g b)temp of water bath: 375.65 K c) mass of test tube and foil and gas as sample: 7.5423 g d) barometric pressure: 1.0190 kpa e) ...
November 4, 2010

biology/poetry
Plant life stretched up Hoping for sunlight Optimism failed Tall trees stealing the gold Overcast skies blocked the Sun, giver of life Yesterday--not a cloud in the sky Nightime, just quiet stars Terribly impatient for a new day Hot, warm, drenched in sunlight Everlasting hope...
November 3, 2010

just 754/9471. Nothing else you can do :)
November 2, 2010

As I do not know the context--perhaps she was faking an injury? It would be helpful to provide a source!
November 2, 2010

geography
very, very carefully. You probably shouldn't--for several reasons (which I will list) 1. You value your own sanity 2. You value your time 3. The constitution is a very long document, but to leave any part out would warp its meaning. The words are there for a reason. If you...
October 30, 2010

minum distance
Find the minimum distance from the point (3,0) to y=(x)^1/2
October 6, 2010

Expository Essay Help
John f. kennedy was born in a family with a history of political and public service
September 4, 2010

Algebra
You would take your answers and plug them in to the equation. 4(-6^2)+4(-6)-120=0 and 4(5^2)+4(5)-120=0 then work out the problems and if you are correct 0=0 Hope this helped
May 12, 2010

arithmetic
Thank you for correcting me, my finger must have hit the 5 instead of the 2. The answer is #3.12 Thanks
May 11, 2010

arithmetic
when you are working with a percentage you move the decimal two spots to the left and then multiply the purchase by the percentage of tax in decimals. \$48x0.065= \$3.15 I hope this helps
May 11, 2010

algebra
I know the answers I just am not sure how to work the problem to get them. (a)78 (b)67.5 Please help me with the working of these problems. Thank you
May 11, 2010

algebra
students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=78-15log(t+1) (a)find the students average score when they first took the final exam. (b)what would be the expected average score be on...
May 11, 2010

algebra
Suppose that \$4000 is invested at an interest rate of 5.5% per year, compounded continuously. What is the balance after 8 years?
May 9, 2010

chemistry
Thank you guys I will try both suggestions
March 2, 2010

chemistry
How do I work out the density of HCI at 600 celsius ? Thanks
March 2, 2010

CheckPoint: Interpretation of Ethical Systems Review the scenario in Situation 1 on p. 50 of the text.Write a 200- to 350-word paper in which you explain how you would respond to the scenario. Address these ethical systems in relation to the scenario: ethical formalism, ...
October 15, 2009

math
what is 3/4 times 11/12? thnx!
April 2, 2009

ABUOYANTGIRLANT
January 7, 2009

social studies
during which twenty year period did the native american population of central mexico fall by around four million?
September 18, 2008

math
(-11) (1/8) find the product
February 27, 2008

English expression
internet friends
February 27, 2008

math
however,6 is not a variable..the question is asking to solve for y in terms of other variables
February 14, 2008

math
that means that still equal to 6 right?
February 14, 2008

math
{y-2}/(a^2-5a+6)=(a+1)/(a-3)-(a+2)/(a-2) How can I solve for y in terms of the other variables??? I tried many times, but I just get y=6,can't express y in terms of variables. Can anyone please correct me or teach me?THANKS A LOT!
February 14, 2008

solcial studies
January 17, 2008

Economics
After the U.S. invasion of Iraq, the price of jet fuel used by airlines increased dramatically. As the CEO of Air Canada, you have been presented with the following options. Evaluate these options in the context of decision making model. a) raise airfares to offset cost ...
January 14, 2007

acids and alkalis
Vinegar soap Handwash Mouth Wash baking soda cold tea Ammonia Bleach Washing Powder Oven cleaner
November 4, 2006

math
how manyyards are in a mile? 1760 I think There are 5,280 feet in a mile. There are 3 feet in a yard. 1 mi x (5,280 ft/1 mi) x (1 yd/3 ft) = ?? Note that the first factor cancels miles and changes miles to feet, the second factor cancels feet and converts to yards. The idea ...
October 22, 2006

sociology
I am a student as well and having trouble with my ethnic class... how funny, we all hang out in here... good luck all!
July 20, 2006

Math
There are 5 rows - there are 4 items in each row - there are NO more than 10 items Any idea how this can be solved? Draw a 5 pointed star connecting all the vertices. Place one item at each vertex and one item at the intersection of the lines joining the vertices. Thus, 10 ...
August 24, 2005

Math
Only the 1, +, -, X, / , (, ), and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times? isn't five squared twenty-five, multiplied by three...
August 24, 2005

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