Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 75

**math**

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.37 cross 10−5 ( to the 5th power) watts/cm2 ( cm squared)

**Physics**

The anode (positive terminal) of an X-ray tube is at a potential of +125000 V with respect to the cathode (negative terminal). (a) How much work (in joules) is done by the electric force when an electron is accelerated from the cathode to the anode? (b) If the electron is init...

**Biology**

Im stumped... These answers I cannot find, please and thank you :) 1) In males, the primary target of FSH is the ______. 2)Testosterone and other androgens are secreted by the______. 3)During meiosis, when synapsis occurs, corresponding maternal and paternal chromosomes come t...

**Statistics**

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance

**Math **

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance

**Math**

What expression is equivalent to 16+ 56

**Maths**

And the height too

**Maths**

How do you figure out the diameter of the base of a truncated cone with the measurement of the leaning side and the diameter of the top circle face?

**algebra**

Thanks! No typo, it must just be another trick up my teacher's sleeve!

**algebra**

Johnny has $147 dollars in ten, five and one dollar bills. He has 38 bills. He has twice as many fives as tens. He has three more ones than fives. How many of each bill does he have?

**Math**

If Anna leaves her house at 11:00am and walks to her friends house located 1.34 miles away at 5 miles an hour walking speed, approximately what time will she get there?

**pre calculus**

How do you solve c + 70 + 12c = 196 - 5c

**Spanish III Portfolio**

I am trying to say "Merge" onto that freeway.

**Spanish III Portfolio**

Hello, I am completing a written assignment for my final portfolio and I just wanted to make sure this is grammatically correct and makes sense. Prompt: Think of where you live in relation to the nearest airport. Write down directions on how to arrive at the airport from your ...

**English 11**

what if the author of the article is unknown and it just says its an article from fox news or something like that

**English 11**

when writing a summary of an article what are other ways to let others know that you are talking about the article besides saying the article says this______ or the article is this______?

**Math**

A manufacturer of an anti-inflammatory drug claims that the drug will be effective for 6 hours. An independent testing service determined that the drug was effective for only 80% of the length of time claimed by the manufacturer. Find the length of time the drug will be effect...

**Math**

I have a challenge of drawing as many rectangles as I can but using only 8 squares on a grid that's only 4 across and 4 up. I can only draw two....

**Math**

I have a challenge of drawing as many rectangles as I can but using only 8 squares on a grid that's only 4 across and 4 up. I can only draw two....

**Math**

What?

**Statistics**

Among first year students at a certain university, scores on the Verbal SAT follow the normal curve; the average is around 550 and the SD is about 100. a) what percentage of these students have scores in the range 400 to 700? b) There were about 1000 students with scores in th...

**calculus**

A hunter at a distance dx from a coconut tree points the nuzzle of his gun directly at a monkey sitting on the tree at a height dy. The monkey sees the hunters and drops vertically from the tree at the very instant of firing. Will it be hit by the bullet?

**physics**

What does it mean when they say that action equals reaction?

**physics**

a cannon fire a bullet into a castle. leave the gun with velocity of 110 with an angle of 20. the bullet reaches highest point at P when it is 1 m above the castle. What is the height of the top of the castle? and waht is the horizontal distamce between the accnon and the castle

**calculus**

identify the type of curve and sketch the graph of y2-2x+6y+5=0

**Math**

Shawna thinks that 8 x 2 = 17. What number pattern shows that she is not correct?

**physics**

A car is moving along with a velocity of 88ft/sec and has a weight of 2000lbs. The engine suddenly stops. If the coefficient of frictgion between the car and road is .2.(a) Find the acceleration. (b) How long will it take to come to rest? (c) How far will it travel before it s...

**physics**

An object has a mass of 2kg and rests on a surface where the coefficient of friction is .2. (a) Find the acceleration of 10 m/sec squared (b) Assume Vi=0, how long does it take to travel 100m? (c) What is the velocity at this time?

**math**

620

**math**

how many pieces of ribbon each 4.5 cm long can be cut from alength of 4 and a half metres?

**physics**

What force must be exerted to prevent a truck weighing 15 tons from rolling down an inclined plane which makes an angle of 3 degrees with the horizontal.

**physics**

The rafters of a roof meet at an angle of 120 degrees. What force is exerted along the rafters by an object weighing 6000nt suspended from the peak?

**Physics**

Two forces act concurrently on a point P. One force is 60nt due east. The second force is 80nt due north. (a) Find the magnitude and direction of their resultant. (b) What is the magnitude and direction of the equilibriant?

**physics**

what is the coefficient of sliding friction between a 3.2kg sled and snow when the sled, carrying a 25kg boy, can be pulled with a force of 35nt?

**physics**

What is the force required to move a 22kg ccrate up an incline of 35 degrees, if the coefficient between the two surfaces is .30?

**physics**

A boy exerts a horizontal force of 2nt to pull his 2kg sled over the snow. If he gives someone a ride on his sled and he has to exert a 12nt force to pull the sled, how much does that person weigh and what is their mass?

**physics**

(a)If a crate slides down a 10 degree incline at uniform speed, what is the coefficient of friction between the crate and the incline?(b)What is the coeffiecient of friction using a 20 degree incline?(c)What is the coefficient of friction using an n degree incline?

**physics**

A box having a mass of 50kg is dragged across a horizontal floor by means of a rope tied on the front of it. The coefficient of friction between the box and the floor is .3. If the angle between the rope and the floor is 30 degrees, what force must be excerted on the rope to m...

**Human Physiology**

How do low plasma protein levels produce edema?

**Human Physiology**

What would be the effect of low blood protein levels on the colloidal pressure?

**Physics**

The period of revolution of a satellite is 90min. What is the altitude above the surface of the earth?

**Physics**

A car goes through a curve with a constant velocity of 60mph and experiances a centripital acceleration of 77.4 ft/secsquared. Find the radius of the curve.

**Physics**

The frequency of an electon orbiting a nyclear is 1000000000 cps and the radius is 5 * 10 to the -12m. Find the velocity of the electron.

**physics**

a satellite orbits the earth at an altitude of 5000 m above the surface of the earth. Assuming that acceleration due to gravity is still 9.8 m/s/s, find the time for 1 revolution.

**Physics**

If radius = 1.25 when i am swinging a bucket around and around what is the slowest possible speed i can go without it spilling?

**physics**

the period of revolution of a satellite is 90 min. Find the radius of the orbit assuming an acceleration of 9.8 m/s/s.

**physics**

a body is projected at an angle with the horizontal with an initial of 500 m/s. 4 seconds later it hits the ground. find theta and the horizontal range.

**physics**

If a bomber travels horizontally at a speed of 250 km/hr and at a height of 5000 m how far away (measured horizontally) from the target must a bomb be released?

**physics**

two tall buildings are 80 m apart. A ball is thrown at 100 m/sec from one building toward the other but at an angle of 37 degrees below the horizontal. Find the vertical distance through which the ball falls before it hits the other building.

**phisics**

A ball is thrown with a speed of 20 m/sec at an angle of 60 degrees below the horizontal from a bridge whisch is 30 m above the water. Where does the ball hit the water? How long is it in the air?

**chemistry**

1 liter of a 1 M lithium hydroxide solution is added to 1 liter of a 1 M barium chloride solution, and a precipitate forms. What ions are left in solution after the reaction is complete? What ions are left in solution after the reaction is complete?

**algebra**

Kayla wants to buy snack that weigh 1 kilogram How much she'll have to pay if she buy food in bulk. t=total price p=price per kilogram

**Math**

.2611

**Algebra**

what is the equivalent expression of g+x

**geography**

what makes a town a town a village a village and a city a city

**Science**

If the volume of 26.100 grams of chloroform has a density of 1.49 g per ml, then what is the mass? I got 18.125. Is this correct? My other question is, if the mass of an aspirin is 250 mg, then what is the mass in kg? I got, .00025. Is this correct? Thanks, Elise

**science**

If the volume of 26.100 grams of chloroform has a density of 1.49 g per ml, then what is the mass? I got 18.125. Is this correct? My other question is, if the mass of an aspirin is 250 mg, then what is the mass in kg? I got, .00025. Is this correct? Thanks, Elise

**science**

Is milk a homogenous mixture? Thanks-Elise

**Algebra**

How do you factor c^2+3c-1? Thanks for your help -Elise

**French**

Can anyone find a French dictionary online with spoken pronounciations, where you click, and a voice pronounces the word? Thanks ~Elise

**Math**

How do you do long division with polynomials? EX: x-2 divided by x^3 + x^2 +4x ???

**Algebra**

Below is a "complete the square problem" from a math help site on the internet. This is the original problem. 4x2 – 2x – 5 = 0 Move the loose number over to the other side. 4x2 – 2x = 5 Divide through by whatever is multiplied on the squared term. x^2-...

**algebra**

The square that I am supposed to complete is x^2+15x, and the answer is (x+15/2)^2. How does this answer account for the 15 separate from the 15^2? I am confuzzled. Same thing goes for x^2-7x the answer is (x-7/2)^2, but I don't see what happened to the original -7. Thanks...

**music**

I would suggest that you google these words together, for example "mozart prodigy" or "mozart chamber," etc. Find out what significance they play in Mozart's life, and then write a paragraph. You could organzize your paragraph in order of Mozart's a...

**music**

A search engine again would help you with this. Check your notes or textbooks from music class: these are pretty basic topics, so I'm sure your teacher would have given you some info on them. If not, just google it. This is not the kind of question people on jiskha will ex...

**Algebra**

How does 3x(4x+5)-5(4x+5) factor out to be (4x+5)(3x-5) ? This may be wrong, because I wrote this answer in my notes, but could some one please explain this to me? Also, do you have any tips on factoring? I understand the concept when I see an example(Usually), but I have a ve...

**Science**

What is part of the mantle that can bend like plastic?

**biology**

My teacher asked quite a few questions, but these are the ones with which I am having trouble...I have re-worded them somewhat for clarity. Can anyone please help me! Thank you! _____________________________________ Methotrexate is a cancer drug that inhibits the enzyme “...

**Business Economics**

I got a few answers but I don't know which one is correct. If the SMC = 80 - 0.1Q + 0.0001Q2, what would be the correct answer fo AVC? I'm still a bit confused.

**Business Economics**

How do you generate the average variable function (AVC) given the estimated marginal cost function (SMC)?

**American History**

How did the Navigation Acts help colonial development?

**english-creative writing**

I really want a list of strong words; nouns, adjectives, and verbs. For my creative writing class I really want strong, concrete words to place emphasis on the right spots in my writing. Thanks. P.S.I'm in high school so please keep that in mind when providing list!Thanks ...

**science**

what spacifc web site can we look on to do the theory orf evolution on darwin??? (:

**science**

were doing simple machines and on my paper it shows a door knob What simple machine is that ( lever,wedge etc.) And my sec que it also shows scissors what simple machine is that?

**Math**

Well y = to 15 right? 2(15-10)= 18?

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