Tuesday
October 21, 2014

Posts by kate


Total # Posts: 1,699

Physics
two objects move toward each other collide and separate. there was no net external force acting on the objects but some kinetic energy was lost. is momentum conserved ? what is the explanation ?
August 16, 2013

math
= 27600 X 100/115 = 24000
August 16, 2013

Physics
An object with mass 20 kg is moving horizontally. if the velocity of the object is doubled, does the momentum increased or decreased ? what is the explanation ?
August 16, 2013

math
4/57(x+8)=1/3
August 16, 2013

Chemistry
3.00 g of Zn is allow to react with 1.75 g CuSO4 . calculate how many grams of Zn will remain after the reaction is complete ?
August 11, 2013

Chemistry
suppose 8.00 g of CH is allowed to burn in the presence of 9.00 g of oxygen. how much (in gram) CH4 , O2 and H2O remain after the reaction is complete ?
August 11, 2013

Chemistry
0.300 moles of bromine gas (Br2) and 0.500 moles of chlorine gas (Cl2) react to for tribromochlorine (Br3Cl). how many moles of this product will form ?
August 11, 2013

biology
Why all enzyme work well in their own optimum temperature and optimum pH ? i need more explanation about why different enzyme have different optimum temperature and different optimum pH to react. i hope to get a long explanation for my essay that contain 5 marks.
July 31, 2013

Harvard Justice
According to the Professor Sandel, if judgments about the good are unavoidable in debates about justice and rights, is it possible to reason about the good (these judgments about the good)? a) If reasoning about the good means that you must have a single principle or rule or ...
July 31, 2013

biology
Do all enzymes function within the different temperature range, like they do with pH?
July 29, 2013

physics
as i have known that centripetal force is directly proportional to the angular speed square. so, what is the relationship between angular speed and centripetal force ? when centripetal force increase, does angular speed increase too? i need more explanation.
July 29, 2013

math
solve my system of equation with full steps 3x+4y=29 2x–5y=-19
July 24, 2013

english
use athlete in the sentence an ____ training requires long hours of exercises.
July 23, 2013

physics
what is the source of error occur in experiment Standing Waves (tuning fork)?
July 16, 2013

Physics Experiment
sorry, wrong typo... the answer is when the water level is lower, the air in the glass tube. the changing of the L is to match the natural frequency of the air column inside the glass tube with the tuning fork that vibrate at fixed frequency. when the matching is achieve, the ...
July 11, 2013

physics
what is the source of error occur in experiment Standing Waves (tuning fork)?
July 11, 2013

Chemistry
Henry's Law says: Pressure(gas)=(Henry's Law Constant)(Molarity of the gas)… we are looking for Molarity so we can rewrite the above equation as… Molarity of the gas=Pressure(gas)/(Henry's Law Constant) so… M=1.95 bar/29.4 barM-1 the bar units cancel...
July 5, 2013

phy
An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is the efficiency of the engine (ii)How much work is done during the cycle? (iii)What is the power output of the engine if each cycle last for 0.5 ...
July 4, 2013

phy
(Q1)A gas occupies a certain volume at 27c.If it is heated at constant pressure, its volume is exactly doubled at a temperature of. (a)54c(b)219c(c)327c(d)600c (Q2)If the specific heat capacity of water initially is4.2000/kg/k and the difference in temperature of water between...
July 3, 2013

phy
(Q1)the temperature at which the tungsten filament of a 12v and 36w lamp operates is 1730c.If the temperature coefficient of resistance of tungsten is 0.006/k, find the resistance of the lamp at room temperature of 20c (a)10.00(b)0.45ohms(c)0.39ohms(d)4.00ohms (Q2)At what ...
July 3, 2013

phy
(Q1)A wire of cross- sectional area of 0.00006m2 and length 50cm stretches by 0.2mm under a load of 3000n.Calculate the Young's modulus for the wire (a)80000000000Nm-2(b)125000000000Nm-2(c)25000000000Nm-2(d)5000000000Nm-2 (Q2)a square plate of side 10cm is made of a metal ...
July 3, 2013

phy
(Q1)calculate the electric power which must be supplied to the filament of a light bulb operating at 3000k. the total surface area of the filament is 0.000008m2 and iits emissivity is 0.92.(a)20.3w (b)33.8w(c)46.4w(d)56.7w (Q2) calculate the change in internal energy of 2kg of...
July 3, 2013

phy
an ungraduated mercury thermometer attached to a millimeter scale reads 22.8mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is 20
July 2, 2013

Chemistry
How do I calculate this? How many grams of CaCl2 is in 500 mL 0.1 M solution of CaCl2
June 25, 2013

physics
A 2.0-m-tall, 30-cm-diameter concrete column supports a 3.0×105kg load. By how much is the column compressed (in mm) ?
June 22, 2013

Math
7/3a + 2/5= ?
June 9, 2013

business math
paychecks each week will be as follows : $325 x 40 = $13,000 (gross earnings /week) $13,000 x 0.062 = $806 (total combined social security) $13,000 x 0.0145 = $188.50 (total medicare taxes) social security : 806 medicare: 188.50
June 8, 2013

physics
A box is placed 50 cm away from a double convex lens. The image is on the opposite side of the lens, is inverted and 50 cm away from the lens. find: a)the focal length of the lens. b)the height of the image. c) using the focal length that you found, how far from the lens would...
May 30, 2013

MATH
1- increase 1000 dollars by 10% then decrrese ur answer by 10% wat do u notice? 2- my parents increased my pocket money by 10% then 3 months later increased it by further. 10%'. My father said there was an increase of 21% , can u explain this?
May 25, 2013

Algebra
Thank you
May 22, 2013

Algebra
You are building a rectangular deck. The area of the deck should be 250 ft squared. You want the length of the deck to be 5 ft longer than twice its width. What should the dimensions of the deck be? My work: 250=2x(x+5) Is this correct so far?
May 22, 2013

Frenchhhhhhhhhh
Thanj u all
May 22, 2013

Frenchhhhhhhhhh
1- avez vous des eu 2- tu en as / des as? 3- elles des ont?
May 22, 2013

Frenchhhhhhhhhh
Replace the capitalized words with either, le,la,en,des..
May 22, 2013

Frenchhhhhhhhhh
Please help! I have to replace 1- avez-vous eu DES CADEAUX pour votre anniversaire? 2- tu as des COURS DE FRANÇAIS tous les jours? 3-elles ont beaucoup D'AMIS au collége??
May 22, 2013

Algebra
Use the zero product property to solve the equation: -3n(2n-5)=0
May 21, 2013

AP English Lit
Thank you so much! I appreciate it. :)Kate
May 21, 2013

AP English Lit
I think your right but I've no idea what else it could be. I don't know what to do. :( Kate
May 21, 2013

AP English Lit
Hi, I was wondering what kind of poem "Dream Variations" by Langston Hughes is? I've narrowed it down to blank verse or free verse but I'm not sure. Please help. Here is the poem: Dream Variations To fling my arms wide In some place of the sun, To whirl and ...
May 21, 2013

AP English Lit
Well, it's not a sonnet because it has 12 lines. So, I'm not sure but I think it's blank verse? Maybe. But, it might also be couplets. By the way, thanks for getting back to me. Kate
May 20, 2013

AP English Lit
Hi, I have a question that I'm stuck on. Do you know what kind of poem William Butler Yeats's poem "When You Are Old" is? That is, is it a sonnet or an epic or something else altogether? Please help! Here is the poem: <strong>When You Are Old</strong...
May 20, 2013

TRIGONOMETRY
Can someone please show me step by step solutions? I'd appreciate if you did so I know how you get the answer. Thank you so much! Solve each equation, giving a general formula for all of the solutions: a)2sin^2 x-5sinx-3=0 b)(cosx-(sqrt2/2))(secx-1)=0 Would the general ...
May 18, 2013

TRIGONOMETRY
Aah, okay! That's easy enough! That makes total sense. Thanks!
May 18, 2013

TRIGONOMETRY
Evaluate the expressions: a) arctan(-sqrt(3)) a) Arctan(-sqrt(3)) So, I know how to find the answers with a calculator, but how do I find it step by step?
May 18, 2013

Physics
2 factors that increase static friction? Could it be weight or the ground?
May 18, 2013

TRIGONOMETRY
Yeah, I figured it out once I posted it. Sorry for that! But thanks for responding anyways. I misread read the question. You've been a huge help actually explaining these answers. I'm feeling really good about my final! :)
May 18, 2013

TRIGONOMETRY
Use the dot product to determine which of the following vector pairs are orthogonal. a. v1 = (-5,5) and v2 = (1,1) b. v1 = (154,169.4) and v2 = (88,64)
May 18, 2013

TRIGONOMETRY
Can someone please give me a step by step answer on how to find the complex cube roots of 8(cos(4π/5)+isin(4π/5))? I need to know how to do this for my trig final next week.
May 17, 2013

TRIGONOMETRY
I'm sorry, I mean could you convert w= 1+sqrt3i to polar coordinates. I already did the other. My bad.
May 17, 2013

TRIGONOMETRY
I don't understand how to convert -3-4i to polar coordinates. I need to know how so I am ready for my trig final next year. Can someone please show me step by step how to solve this? Thanks
May 17, 2013

english
Yeah, I'm sorry, I don't understand what you're "asking", Anonymous.
May 17, 2013

english
Are you asking if the sentence has correct grammar? If so, no revision is required.
May 17, 2013

TRIGONOMETRY
Can someone please show me step by step how to calculate the modulus and the argument for these complex numbers? I have a trig final next week and I am trying to finish this study guide so I am prepared. Thank you so much! If you can, please show my how you get the answer so I...
May 17, 2013

TRIGONOMETRY
y/r!! That makes much more sense! Someone else had told me y/x, so that's why it didn't work. Thanks!
May 16, 2013

TRIGONOMETRY
3. The rectangular coordinates of a point are given. Find the polar coordinates of each point. b. (0,3) I figured out a, but I canNOT figure out b. Can someone please explain? :)I need to know how to do this for my final next week.
May 16, 2013

Math
1- 75 is what percent of 500? 2- 30% of 30 is wat #? 3- 90% of wat num is 207?
May 16, 2013

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 4. Transform each ...
May 16, 2013

TRIGONOMETRY
Thanks, Steve! :)I appreciate your help!
May 16, 2013

TRIGONOMETRY
Can you check my work, please? This is for a trig study guide for my final next week. I'd like to know if I'm doing this right. :) 2. The polar coordinates of a point are given. Find the rectangular coordinates of each point. a. (5,(π / 4)) b. (-2,(π / 6)) ...
May 16, 2013

TRIGONOMETRY
I tried converting (0,3) myself, but I can't seem to get your answer. What am I doing wrong? b. (R, theta) R = sqrt(x^2 + y^2) R = sqrt(0^2 + 3^2) R = 3 theta = arctan y/x theta = arctan 3/0 theta = 1.249 = (3, 1.249)
May 16, 2013

TRIGONOMETRY
Aaah, so those are the formulas! I'll remember those. That helps so much! You're awesome! Thank you for not just giving me the answers. The point of a study guide is to study and know how to get to an answer. Usually people just give the answer without showing the ...
May 16, 2013

TRIGONOMETRY
Can you please help me with this question on my study guide for my trig final? Thanks! I'd also appreciate if you can check out my other postings and check my work for some other study guide questions. I want to make sure I'm ready for my final. :) 3. The rectangular ...
May 16, 2013

Math
A mixture of petrol and oil for a two stroke lawn mower contains 85% petrol, how much oil is required for 18 litres of the fuel mixture?
May 16, 2013

Physics helpp
Newtons 2nd law The force of earths gravity is about 10 N downward. Whats the acceleration of a 15kg backpack if lifted with a 15N force??
May 14, 2013

Physics
And how do i find the mass if its missing? Formula?
May 14, 2013

Physics
Newtons second law What net force acting on a 14kg wagon produces an acceleration of 1.5 m/s^2?
May 14, 2013

history
Sorry it was a typo, but thank you.
May 13, 2013

history
What does this quote mean? "It is honorable to be raised to a throne than to be born to one. Fortune bestows (gives) the one, merit obtains to other." -Francesco Petrarch
May 13, 2013

English
Does this sentence have correct parallelism? Using steam power helped people spin cotton and grind flour.
May 10, 2013

Social
Thanks alot
May 9, 2013

Social
What are the goal and practices of mormons?
May 9, 2013

Physics
1- you push a coin across a tabble, the coin stops. How does this motion relate to balanced and unbalanced forces?
May 7, 2013

Physics
Which causes an object in motion to stay in motion? A) friction b) gravity C) inertia D) velocity Its not friction..
May 7, 2013

science
what happens to the G-force as the speed of the centrifuge increases?
May 5, 2013

Chemistry
why is it important to know accurately the mass of water used in a calorimeter?
May 5, 2013

Statistics
The Education Testing Service conducted a study to investigate differences between the scores of males and females on the SAT. The study identified a random sample of 562 females and 852 males that had achieved the same high score on the math portion of the test. That is, both...
May 3, 2013

statistics
A firm having 4000 employees took a random sample of 25 in order to estimate their average annual state tax payment with 99% confidence. If the results were X = $640 and s = $20, what is the best interval estimation?
May 3, 2013

chemistry
Methane gas is burned releasing Carbon Dioxide into the atmosphere. How much CO2 (g) is released if 78.5 Liters of Methane is burned? CH4 + O2 --> CO2 + H2O
May 1, 2013

Calculus
A particle moves along the curve y = sqr(1+x^3). As it reaches the point (2,3), the y-coordinate is increasing at a rate of 4cm/s. How fast is the x-coordinate of the point changing at that instant?
May 1, 2013

art history
What is the Etruscan influence on Roman, Byzantine and Romanesque visual culture?
April 30, 2013

English
1. If you are filled with anticipation about an event, you are (1 point) ***looking forward to it. planning to avoid it. hoping to delay it. 2. Read the following excerpt from Sky: We finally reached Enkhuizen, an ancient harbor town, where the brisk wind from the sea was ...
April 28, 2013

Science question
It is right microwave. Only certain types of microwaves use batteries. All phones, radios, and definately flashlights use batteries.
April 23, 2013

math
the product of 2 consecutive integers is 156. find the integers. I found them mentally 12 and 13 but, how do I find them while solving?
April 18, 2013

math
thanks
April 11, 2013

math
If the first of 1000 consecutive whole numbers is odd, their sum must be a) even b) odd c)prime d) negative Help?
April 11, 2013

Math
Two investments are made totaling $4800. In the first year they yield a total of $412 in simple interest. Part of the money is invested at 8% and the rest at 9%. Find the amount invested at each interest rate.
April 11, 2013

Chemistry
If you wanted to prepare 50.0 mL of hydrogen, collected over water at 25 C on a day when the barometric pressure was 730 torr, what mass of aluminum would you react with a hydrochloric acid? (Balance the equation first.) ___Al(s)+___HCl(aq)=___AlCl3(aq)+___H2(g)
April 8, 2013

Chemistry
A sample of iron reacted with hydrochloric acid. The liberated hydrogen occupied 40.1 mL when collected over water at 27 C at a barometric pressure of 750 torr. What is the mass of the sample of iron? (Because of the collection of gas over water, the vapor pressure of the ...
April 8, 2013

Chemistry
What volume of hydrogen, measured at 25 C and 1.00 atm can be produced by dissolving 5.0 g of magnesium in hydrochloric acid? (Write and balance the equation for the reaction first.)
April 8, 2013

Chemistry
Instead of a strip of pure Mg ribbon, you are accidentally given a strip of an aluminum-magnesium alloy. You calculate the mass of the strip as above. Would the mass of the strip be higher or lower than expected? Write the appropriate chemical equations (one equation for the ...
April 8, 2013

Chemistry
If the strips of MG ribbon are coated with white MgO, would this cause the mass of Mg that you calculate to be too high or too low? Why?
April 8, 2013

Chemistry
If your partner did not take into account the vapor pressure of water when calculating the moles of hydrogen produced, would the mass of Mg that was calculated at the end of the experiment be too high or too low? Why?
April 8, 2013

la
shoud students who fail their classes be retained and have to repeat the grade ?
April 2, 2013

la
shoud students who fail their classes be retained and have to repeat the grade ?
April 2, 2013

chemistry
Use the molar volume to find the volume, in liters, of 6.40g of O2 at STP.
April 1, 2013

Pre-Algebra
How many different ways can you choose 3 frozen yogurt toppings from 20? 6,840 1,140 60* 2,260 I think it is 60 because 3*20 however not positive.
April 1, 2013

Finance
They will need 200,000 in 18 years and they can expect a rate of return of 6 %. How much will they need to invest annually. I would have set it up and gotten $70068.76 but then do you divide by 18?
March 28, 2013

science
During condensation, what must be changed, temperature or heat energy?
March 25, 2013

chemistry
N2(g)+H2(g)-NH3(g) Calculate the volume of ammonia gas produced when20cm3 of nitrogen gas was reacted with an excess of hydrogen gas
March 25, 2013

physics
A bird wants to rech its nest that is located 53 meters (35 degrees south of west) from where it is perched. If the maximum speed that the bird can fly with respect to the air is 12m/s and there is a wind blowing from a direction of east 35 degrees south at a speed of 8.1 ...
March 24, 2013

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