A storage battery has an emf of 6.3 volts and an internal resistance of 0.01 ohm. it is to be charged for 120 amperes.hours from a 30 volt emf source having a resistance of 0.08 ohm at the rate of 20 amperes. a. compute for the resistance needed b. what is the cost of ...
September 16, 2015
Can you please help with this question which says'descrie a recent service delivery protest in your community or in the neibourhood.what are the problem that the community faced?.under the following topic:campaign with responsibility
May 16, 2015
At Frugal Foods a loaf of bread cost about $1 in 1980. In 2013, the loaf of bread cost $2.50. 1.A ratio is a comparison of two amounts by division. What is the ratio of the cost of a loaf of bread in 2013 to the cost in 1980? 2.50/1 2. Assuming the price of clothing increased ...
May 14, 2015
A particular brand of toothpaste claims to contain 0.24 wt% sodium fluoride. What mass in grams of fluoride ion would be present in the average amount of toothpaste used to brush one's teeth, about two grams? Now this is a weight percent concentration question, I know that...
May 7, 2015
As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution and compare these ...
May 3, 2015
A stone is thrown straight up from the edge of a roof, 625 feet above the ground, at a speed of 20 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 2 seconds later?
April 21, 2015
A 8 kg mass is attached to a spring hanging from the ceiling and allowed to come to rest. assume that the spring constant is 40 n/ m and a damping constant is 3 N/m. At t=0 and external force of 2 sin(2t+PI/4)N is applied to the system. determine amp, frequency and steady ...
April 10, 2015
2x^2=-8x+10 I got x=-2-1i x=-2+1i But every time I plug the numbers back into the equation I am not getting the sides to equal. Not sure how to use the imaginary i.
February 27, 2015
solution making/ chemistry/biotech
You have 750ml's of a solution that was originally made up using a 20X stock. How much stock was used? I think the answer is 37.5 by dividing 750/20 but I am not sure
February 26, 2015
Suppose you start with a 5X solution A, and you want a final volume of 10ul of 1X solution. How much Solution A do you need? Can you please check my work not sure. I need 2 ul of solution A to 8 ul of H2O. 5/1=.2*10=2
February 23, 2015
I would like to know if i have used the correct grammar and punctuation in the following two sentences: 47. "Have you ever read the story, 'The Tell-Tale Heart' by Edgar Allen Poe?" Dave asked. 48. "Did the professor say, 'Put down your pencils'...
January 31, 2015
I would like to know if i have used properly structured sentences for the following: 49. To succeed in the new economy, workers will have to learn throughout their careers adapt to changing circumstances, and self-motivate when needed. 50. Some students hate math; some ...
January 31, 2015
Intro to computers
You have set up Remote Desktop for the company server running Server 2008 so that your users can RDP in from their XP workstations. Users are calling you saying that they are being denied the ability to remote in. What is the most likely reason? A. XP does not support Remote ...
January 11, 2015
An object is placed 4 cm in front of a concave lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014
An object is placed 4 cm in front of a convex lens of focal length 3 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014
An object is placed 11 cm in front of a convex mirror of focal length 4 cm. Using the lens equation, find where the image will form and state whether it is a real or virtual image.
December 13, 2014
Calculus angle of elevation
Bob is wrong dx/dt = 3ft/s, dƟ/dt = ? 5ft/x = tan Ɵ Differentiating each side with respect to the time: (-5ft)/x^2 dx/dt=〖sec〗^2 ϑ dϑ/dt So dϑ/dt=(-5ft)/x^2 dx/dt.〖cos〗^2 θ We want to evaluate the change at the ...
December 9, 2014
A ball is thrown horizontally from the top of a building 45.9 m high. The ball strikes the ground at a point 121 m from the base of the building. The acceleration of gravity is 9.8 m/s2 . Find the time the ball is in motion. Answer in units of s Find the initial velocity of ...
November 16, 2014
A descent vehicle landing on the moon has a vertical velocity toward the surface of the moon of 22.7 m/s. At the same time, it has a horizontal velocity of 58.9 m/s. At what speed does the vehicle move along its descent path? Answer in units of m/s At what angle with the ...
November 16, 2014
The polynomial function defined by f(x) = 1 − x + x^2 − x^3 + ... + x^16 − x^17 may be written in the form f(y) = a_0 + a_1 y + a_2 y^2 + ... + a_16 y^16 + a_17 y^17, where y = x + 1 and a_i s are constants. Find a_2.
November 15, 2014
Find the points at which y = f(x) = x^11-6x has a global maximum and minimum on the interval 0 ¡Â x ¡Â 4 Round your answers to two decimal places. Global Maximum: (x,y) = (,) Global Minimum: (x,y) = (,)
October 29, 2014
Find the x- and y-coordinates of the center of gravity of a 4.00 ft by 8.00 ft uniform sheet of plywood with the upper right quadrant removed as shown in the figure below. The dimensions of the cutout are a = 4.50 ft and b = 1.70 ft. HINTS: Think of the board as being made of ...
October 28, 2014
Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...
October 18, 2014
A 20 kg object is acted on by a conservative force given by F = -3.0 x - 5.0 x 2, with F in newtons and x in meters. Take the potential energy associated with the force to be zero when the object is at x = 0. (a) What is the potential energy of the system associated with the ...
October 9, 2014
Suppose 1.2x10^3 kg of C is mixed with 2.4x10^5g oxygen gas and carbon dioxide forms. 1. write the reaction and balance 2.which reactant is the limiting reagent and which reactant is in excess 3. How many grams of carbon dioxide will be formed.
September 27, 2014
A 2.556g sample of baking soda (NaHCO3)decomposes to produce 0.876g of solid sodium carbonate. Caculate the theoretical yield and the percent yield of the sodium carbonate. The equation is: 2NaHCO3(s) -> Na2CO3(s) + H2O + CO2(g)
September 22, 2014
balanced equation =2 H(2)+ 1 O(2) -> 2H(2)O A. What mass of H2O would be produced from7.4 mg of O2 B. What is the volume of H2O would be produced from 7.4kg of O2. Density of water = 1.000g/ml
September 20, 2014
Country A is producing 4 units of X and 8 units of Y and country B is producing 4 units of X and 6 units of Y. The opportunity cost of producing more of A) good X is the same for both countries. B) good Y is the same for both countries. C) good X is lower in country A. D) good...
September 15, 2014
At some instant, a particle traveling in a horizontal circular path of radius 7.80 m has a total acceleration with a magnitude of 15.0 m/s2 and a constant tangential acceleration of 12.0 m/s2. Determine the speed of the particle at this instant(initial speed) and (1/8) ...
September 12, 2014
How would I make 500 ml's of a .35M NaCI solution. MW= 58.44 ( I know how to do the first part) How many micromoles of NaCI would be present in that solution? What would be the percentage of NaCI in that solution?
August 27, 2014
Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the 95% confidence ...
July 19, 2014
Thank you very much. I still have these sentences I'm doubtful about. My doubt is whether I should use the present perfect or the simple past (considering that it is the end of the school year) 1) Exercises for literary text analyses aimed at developing lexicon have been ...
May 12, 2014
Can someone check the grammar in the following sentences? Thank you in advance. 1) The nuclear power station can give our town a lot of energy and jobs to people. 2) We won't be able to use the farmland near the power station because it will be polluted with chemicals. We ...
May 12, 2014
The variables arr1 and arr2 have been declared as pointers to integers . An array of 10 elements has been allocated, its pointer assigned to arr1, and the elements initialized to some values . Allocate an array of 20 elements , assign its pointer to arr2, copy the 10 elements ...
March 16, 2014
Can someone help me with these sentences? Which of them are grammatically correct? Thank you very much in advance. 1) They are not able to dance well. 2) They can't dance well 3) Are you able to play the piano? 4) Can you play the piano? 5) Were you able to find the book ...
February 27, 2014
Can someone explain to me the difference between angry about and angry for (when a verb follows)? I think "about" is used in sentences like: he is angry about being in jail (Would "for" be possible in this sentence?) he is angry with me for being rude to ...
February 24, 2014
Can someone check if the questions and the sentences are grammatical? Thank you. 1)Can you fly with a Bergonian passport? 2) Why might visitors not be welcome on Seeland? 3) What are the citizens of the Aerican Empire like? 4) What happened to Danny when he accepted his friend...
February 20, 2014
Yes, I wrote the sentences incorrectly: Thank you He was seen to watch the TV He is still dependent on ... but independent of.... I was so angry WITH him FOR behaving like that in front of everyone. (about behaving would be a mistake?) The teacher was annoyed WITH me FOR ...
February 15, 2014
Can someone check if the following prepositions/verbs are correct? Thanks 1) I couldnt help CRYING 2) Its no use EXPLAINING it to him; he wont understand. 3) He was seen TO the watch. 4) I cant afford TO BUY it. 5) Norma is anxious ABOUT making the ...
February 14, 2014
Can someone check these sentences, please? I thank you in advance. 1) Lady Macbeth "becomes sleepwalking" 2) Cowardice is the ability to bear the sorrows of our life and to stay alive, while courage is facing death by committing suicide 3) We can't be sure about ...
February 14, 2014
Can someone please help me check the grammar in the following sentences? 1) I would like to inform people about the danger (after effects?) of having a nuclear power station near our town 2) I hope you will listen to our advice. 3) Animal and plant species will be in danger.
January 27, 2014
Can someone of you check these sentences, please? Thank you in advance. 1Complete the sentences with the correct form of should, must or have to. 1You _________ be worried. This test is very easy. (dont have) 2All the students _________arrive on time. (must) 3In my ...
January 24, 2014
Can someone check if the following questions are grammatically correct? Thank you. 1)Please Henry the VIII rule by focusing on the following: -Why he broke ties with the church -What the Act of Supremacy established -What political and social changes the reformation brought ...
January 20, 2014
Can someone tell me what's the British for the words "common trash barrels", "sorted trash", "regular kitchen" trash or food/garden waste? Thank you I'm quite environmentally friendly. I have three containers at home into which to sort my ...
January 14, 2014
Can someone help me with these sentences, please? Thank you very much in advance. I use the Internet to conduct school research, use translation programmes, use an online homework agency, do online shopping, play games, chat with my friends, send private instant messages, log ...
January 9, 2014
Can someone check these sentences, please? I need to prepare them for Tomorrow. 1) Air pollution is mainly caused by gases from factories and car exhaust fumes. It can cause acid rain, breathing problems and it can increase the risk of cancer. 2)The destruction of the ozone ...
January 8, 2014
Just one more thing. Which of the following sentences are grammatical? Thank you very much for your cooperation. 1.I spent most of my holiday at home. 2. I spent the greatest part of my holiday at home. 3. I mainly/mostly stayed at home during my holiday. 4.For the most part, ...
January 7, 2014