Friday

August 22, 2014

August 22, 2014

Total # Posts: 90

**Math**

Two forces of magnitude 15N and 4root2N are acting in the directions 3i-4j and i+j respectively, find the magnitude of the resultant of the two forces.
*May 8, 2014*

**Math**

Two towers P and Q are 600m apart with P being due east of Q. A church is on a bearing of 210 degrees from P and 125 degrees from Q. Find the distance of the church from P and Q.
*April 7, 2014*

**Science **

what mass of sulphuric acid must be added to a 750 ml to have a ph of 2.27
*March 11, 2014*

**Physics**

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...
*February 2, 2014*

**2nd grade math**

80m/11 lights = 7.2728 m between lights, 7.2728 * 4 for a distance of 4 lights in between the two is = 29.1 m
*February 2, 2014*

**Math**

A sample of 5 people is selected from 3 smokers and 12 non-smokers. In how many ways can the 5 people be selected?
*January 24, 2014*

**Mathis**

You have £100 you have to buy 100 animals. 1 chicken costs 50p,1pig costs £10,1 sheep costs £2?
*January 19, 2014*

**Chemistry**

What are the individual orders of the reactants involved in the oxidation of methylene blue by ascorbic acid? Rate of reaction= [MB+]^m * [H2A]^n * [HCl]^p What are m, n, and p?
*November 26, 2013*

**Telecommunications**

If a Signal with a power level of 40 mW is inserted onto a transmission line and the measured power some distance away is 10 mW, calculate the loss of signal strength is decibels.
*October 18, 2013*

**Telecommunications**

We send a frame of 256 bits. If the probability that a bit changes in transmission is 0.001 and each bit is independent. a. What is the probability that exactly 6 bits change? b. What is the probability that exactly 0 bits change ?
*October 18, 2013*

**Telecommunications**

1. System A consists of a single ring with 100 stations, one per repeater. System B consists of four 25 stations rings linked by a bridge. If the probability of a link failure is , a repeater failure is , and a bridge failure is , derive an expression for parts (a) to (d). a) ...
*October 18, 2013*

**Biology**

Enantiomers, like L-alanine and D-alanine, are so similar that ribosomes will incorporate either one into a protein during synthesis. True or False?
*September 21, 2013*

**math**

I am a decimal number and when you multiply me by the number that is 10 times greater than me you get the answer 291.6
*April 8, 2013*

**math**

two trees on a street have the heights of 3 meters and nine metres respectively. at a certain time of day the shorter tree casts a shadow length of five meters how far apart are the trees?
*March 13, 2013*

**math linear alegba**

Find the distance from the point (1, 1, 1) to the line given as the intersection of planes x+2y− 2z = 5 and 6x − 3y + 2z = 8.
*March 4, 2013*

**math**

Anna and Jamie were at track practive. The track is 2/5 kilometers around. Anna ran 1 lap in 2 minutes. How many minutes does it take Anna to run one kilometer?
*December 3, 2012*

**chem**

An erlenmeyer flask contains 56.7 g of KMnO4. How many grams of manganese is in the flask?
*November 29, 2012*

**physics**

a 65kg oak trunk is placed on a board, inclined at an angle of 30 with the horizontal. What is the weight? The Normal Force of the trunk? The Applied force down the ramp?
*November 18, 2012*

**Physics**

You need to move a 129-kg sofa to a different location in the room. It takes a force of 90 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
*November 17, 2012*

**physics**

A staging that weighs Wstaging supports a painter weighing 170 N. The reading on the left scale is 490 N and the reading on the right scale is 220 N. 490 N 220 N What is the weight of the staging? Answer in units of N
*November 13, 2012*

**Physics**

A circular loop with 30 turns and area of 0.25 m2 rotates at 100 rad/s. The axis of rotation of the loop is perpendicular to the direction of the magnetic field of 0.04 Tesla. What is the maximum emf induced in the loop? 15 V 30 V 45 V 60 V I got 15 V but that doesn't seem...
*October 23, 2012*

**Physics**

Which of the following is correct for a step-down transformer? Number of turns in the primary coil is less than the number of turns in the secondary coil. Step-down transformer increases the voltage from low value to high value. Number of turns in the primary coil is more than...
*October 22, 2012*

**science**

A point object is acted upon by forces of 4N, 5N and 6N is in equilibrium. IF=f the 6N force is removed, what is the resultant force on the object now? I really want to know how tow find relationship between 3 forces, and is there anything to do with cos rule??? HELPPPPP-.-
*October 11, 2012*

**science**

An aircraft travels through the air with a velocity of 200m/s due east. It is found to be travelling over the ground with a velocity of 220m/s in a direction of 20(degree) south of east.The difference between the two is due to thw wind velocity. What is the wind velocity?
*October 10, 2012*

**science**

what is the best way to study for my chemistry test tomorrow
*September 20, 2012*

**math**

how do i do the problem 3.14=7x=2y
*September 20, 2012*

**physics**

A train travels at 3m/s and parallel and very near to the train is a wall the has a slope of 12degrees, the window you see this wall through is .9m high, 2m across, and when you look out you first see the top edge at the lower left of the window, moving towards the top right ...
*August 29, 2012*

**ENGLISH--HELP**

they will get more education...duh
*April 12, 2012*

**ENGLISH--HELP**

Every sentence in the paragraph below violates some principle of good persuasive writing. Revise the paragraph, following the directions at the end of each sentence; use your imagination where necessary. Type the revised paragraph in the text box provided below. CAUTION: ...
*April 12, 2012*

**math**

if it takes 1/2 hour to clean 1/8 mile, how long will it take to clean 2.5 miles
*January 29, 2012*

**writing**

Do you have any tips for writing an opinion paper?
*December 1, 2011*

**lit**

is this right? punctuation wise. Franklin Roosevelt said that December 7, 1941, was "A date which will live in infamy."
*October 27, 2011*

**social studies**

How were different religious group (puritans, Quakers)impacted by by the French and Indian War?
*October 6, 2011*

**physical science**

thank you very much!
*April 26, 2011*

**physical science**

how much power is used when a weightlifter lifts a 1250-n barbell 2 meters in 3 seconds...
*April 26, 2011*

**physical science**

Trying to find the power to this ?. A weightlifter lifts a 1250-n barbell 2meters in 3seconds. How much power was used to lift the barbell? Do you have to find the work first??
*April 26, 2011*

**physical science**

whatis the answer to the question???
*April 26, 2011*

**physical science**

It is the the MA of a machine without friction. MA being the ratio of the output force to the input force.
*April 26, 2011*

**physical science**

A mover uses a ramp to push a stereo into the moving van. The ramp is 3 meters long and 1.5 meters high. What is the ima of this ramp?
*April 26, 2011*

**physical science**

ideal mechanical advantage. That is the answer that I got too. It seemed to easy?! Thank you!!
*April 26, 2011*

**physical science**

A screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw, what is the ima?
*April 26, 2011*

**physical science**

can you show me the formula that you used?
*April 26, 2011*

**physical science**

A painter uses a fixed pulley to raise a 1-k can of paint a distance of 10 m,what is the ima??
*April 26, 2011*

**Algebra 2**

i need help, step by step, in solving for fractional coefficients. can someone walk me through?
*April 25, 2011*

**stats**

A sample of 12 observations is selected from a normal population for which the population standard deviation is known to be 4. The sample mean is 19. (Round your answers to 3 decimal places.) (a) The standard error of the mean is The 90 percent confidence interval for the ...
*March 28, 2011*

**6th grade math**

Tonya's car averages 240 miles for each 10 gallons of gasoline. How many gallons of gasoline will the car need travel 216 miles?
*March 24, 2011*

**math**

I'm totally lost and I didn't want to continue posting under my name tootie. Thinking that I wouldn't get the help since I had too many posts
*February 20, 2011*

**math**

The National Association for Women in Science asked recent high school grads if they had taken certain science classes. Of those surveyed, 32 said they had taken physics, 51 said they had taken chemistry and 15 said they had taken both. Ten said they had taken neither. How ...
*February 20, 2011*

**Pre-Algebra**

3n + 15 /2
*January 26, 2011*

**Physics**

A 3200kg helicopter must accelerate up at 1.0m/s^2. What minimum lift do the rotors need to produce? Thanks for answering!
*November 8, 2010*

**math**

point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is -2. How do you calculate the value of k?? thanks for the help
*October 13, 2010*

**math**

point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is 2. How do you calculate the value of k?? thanks for the help
*October 13, 2010*

**math**

where you get slope of BC = 2/(k-4) from??
*October 13, 2010*

**math**

sorry but confussed
*October 13, 2010*

**math**

point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. How do you calculate the value of k?? thanks for the help
*October 13, 2010*

**algebra with pizazz pg 40 riddle**

2(6d+3)=18-3(16-3d)
*September 26, 2010*

**Math**

fart!!
*September 14, 2010*

**maths**

example of a function f:z-->z that is surjective but not injective
*November 17, 2009*

**Math**

You are selling tickets for a high school concert. Student tickets cost $4 and general admission tickets cost $6. You sell 450 tickets and collect $2340. How many of each type of ticket did you sell? A music store is selling compact discs for $11.50 and $7.50. You buy 12 discs...
*November 17, 2009*

**biology**

One rule of probability can be expressed as the following: The probability of two independent events occurring simultaneously is the product of the probability of their occurring separately. If, for example, you had a pair of dice and rolled each die one at a time, what would ...
*November 11, 2009*

**biology**

A cross between two pea plants with axial flowers and inflated pods gives the following offspringg: 20 with axial flowers and inflated pods, 7 with axial flowers and constricted pods, and 5 with terminal flowers and inflated pods. What is the most probable genotype for the two...
*November 11, 2009*

**biology**

One rule of probability can be expressed as the following: The probability of two independent events occurring simultaneously is the product of the probability of their occurring separately. If, for example, you had a pair of dice and rolled each die one at a time, what would ...
*November 11, 2009*

**Biology**

The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the inability to roll the tongue (r). A man and his wife can both roll their tongues and are surprised to find that their son cannot. Explain this by showing the genotypes ...
*November 9, 2009*

**biology**

The first sentence should read: The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the inability to roll the tongue (r). (INability)*
*November 9, 2009*

**biology**

The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the ability to roll the tongue (r). A man and his wife can both roll their tongues and are surprised to find that their son cannot. Explain this by showing the genotypes of ...
*November 9, 2009*

**scince**

what does the cross in the warning signs mean?
*September 19, 2009*

**social studies**

unscrabble this epgbsairrkn
*March 11, 2009*

**science**

thank you
*May 1, 2008*

**science**

Hi. Can someone please help me with this question? Thanks! The transport sector accounts for half of oil used. List other factors that could have accounted for increased oil imports between 1975-1994. Justify your choices.
*May 1, 2008*

**science**

Can somebody please point me in the general direction to the answer for this question? Thanks! How do low fuel prices affect the nation's security?
*April 23, 2008*

**science**

So, are the greenhouse effect and global warming related because CO2 with the greenhouse effect absorbs too much heat which causes global warming?
*March 30, 2008*

**science**

Hi. Can someone please explain to me the exact relationship between the greenhouse effect, global warming, and the ozone layer? I'm kind of confused because we had to write an essay on whether or not the greenhouse effect is controversial and everyone in my class said it ...
*March 30, 2008*

**history**

thanks
*March 26, 2008*

**history**

Were the Korean and Vietnam Wars part of the Cold War? Thanks!
*March 26, 2008*

**nutrition**

A cancer patient recieving chemotheraphy starts 8 weeks of tx weighting 171.5 lbs, with hist ht at 56.5 inches and his BMI at 27. Before he got sick his weight was 183lbs. On day 19 of tx hi had lost 3.5 lbs, on day 23 no wt loss, day 28 he had lost another 3 lbs. By day 38 ...
*March 19, 2008*

**health**

Thank you.
*March 15, 2008*

**health**

Okay, so if you have leukemia, you can also have anemia as a symptom, right? Leukemia can be deadly, right? What if you just have anemia and not leukemia? Is anemia deadly by itself? Thanks in advance.
*March 15, 2008*

**Physical science**

heavy water
*January 16, 2008*

**Biology**

ther are millions of alveolie in each lung making it feel spongy.
*January 15, 2008*

**math**

its ok got the answer now
*January 15, 2008*

**math**

place + and - between the digits so that both sides of each equation are equal ex. 6 4 1 2 6 2 = 15 not sure how to answer this?
*January 15, 2008*

**1ST GRADE GRAMMER**

meaning (one of 2 main parts of a sentence the other being the subject) PREDICATE/ tells somthing about the subject example (giving the apple to the horse) is your Predicate. another example of Predicate in brackets Judy (ran with her dog)
*January 15, 2008*

**Accounts**

The dates that you worked are the dates that you made the money so if its money made in 07 even though you may not have been paid yet it is still income of 2007. 2008 is a different tax year.
*January 15, 2008*

**math**

Not sure how to complete my home work tonight my first question is 2+8=4+ ___ I don't no how to answer please help thankyou
*December 5, 2007*

**math**

last post was math
*September 19, 2007*

**school**

make each point have its own room with 2 squares . . . . . . . . . We cannot figure this out and teacher does not tolerate mistakes
*September 19, 2007*

**math**

consider the conditional statment if you brush your teeth regularly then you won't get cavities. under what circumstances will the sttement be false The statement will be false if other conditions exist that cause cavities. The statement will also be false depending upon ...
*May 12, 2007*

**math**

describe (in words) two different sets of people containing you as a member. describe (in words) the complement of each set. describe what people are not in either the orininal set or the complement set You might think of various categories that include you — gender, age...
*May 12, 2007*

**algebra**

think of a condition under which product of anytwo binomials is a bionomial. you can support your answer with the help of one of the identies of factorization of polynomials A binomial is a polynomial with two terms. Try (x -a)(x + a)and see what you get.
*April 10, 2007*

**Geology**

How do i work out skewness and sorting Thank you for using the Jiskha Homework Help Forum. Hopefully the following sites will help you: faculty.uml.edu/nelson_eby/89.215/Assignments/Sand%20Size%20Distributions.p... http://gpc.edu/~janderso/historic/labman/sievean.htm
*February 12, 2007*

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