Monday

July 28, 2014

July 28, 2014

Total # Posts: 649

**Math**

A model airplane is shot up from a platform 1 foot above the ground with an initial upward velocity of 56 feet per second. The height of the airplane above ground after t seconds is given by the equation h=-16t^+56t+1, where h is the height of the airplane in feet and t is the...

**Math**

Solve the following quadratic-linear system of equations. y=-x^2-x-6 y=2x-2 A. (3, 6) and (–1, 2) B. (4, 6) and (–1, –4) C. (3, –6) and (2, 4) D. (–4, 3)

**science**

Calculate the volume of a graduated cyclinder that has a radius of 10 mm and a height of 120 mm.

**Math**

A spinner numbered 1-10 is spun. what is the probability of spinning a multiple of 3 and a multiple of 2?

**physics**

a car traveling at 43m/s decelerates at a rate of 7.1 m/s squared. how long did it take the car to stop? what distance did the car travel while stopping?

**Health**

As mixed-doubles teammates in tennis, Kara and Tran are trying to devise their best strategy against an opponent that has two excellent servers but his physical fitness level is not as good as Kara and Trans. How can Kara and Tran use their superior cardiovascular endurance to...

**physics**

A spring of force constant 655 N/m is used to launch a 5.25 kg mass from the edge of a frictionless table that is 1.20 m above the floor. How far horizontally away from the table will the mass land if the spring was compressed 42.0 cm before launching?

**Chemistry**

how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...

**Health**

The coach noticed that Caleb really started to kick the soccer ball with great amount of power after the kicking drills. Caleb adjusted the power of his soccer kick by increasing the speed of his kicking leg prior to and upon contact with the ball starting his kick from a two ...

**Physics**

A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto th...

**science**

if 4 cars were going 100m the entire time what happens to speed,velocity and accelerationas one car completes one full lap

**science**

What is the acceleration of a 7kg rocjet if a force of 68.6 kg m/s/s (N) is used to move it away from the earth

**science**

NOT RIGHT!!! 2 is C

**American History **

What three rivers did Lewis and Clark use to get to the Pacific Coast?

**Atomic Model/Science**

I dislike Chemistry :O Anyway I do know this: For an atom, the number of natural occurring protons should have the same number of electrons. So your atom should have 92 electrons given if it's not an (ion or man made isotope).

**Science**

Let: Star = Sun Planets = Earth It's much simpler to understand the question with what we know. Now to answer your question: The gravity of the Sun keeps the earth in it's orbit. This is also true as the Moon orbits the Earth because of the pull of Earth's gravity,...

**Honor's English**

Thank you :-).

**Honor's English**

Which of the following describes the underlined phrase in the sentence below? The local softball team won the championship (against all odds). A) prepositional B) participial C) gerund D) infinitive Process of elimination: It cannot be C since a gerund needs to have -ing at th...

**alegbra **

Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually? My answer is $20,559.34, however, the module says its incorrect.

**Math**

Sam starts from point A at 8:00am and hikes up a mountain path. He arrives at the top, (point B) at 4:00pm. He camps there for the night and the following morning he starts his descent at 9:00am. He travels faster since he goes downhill and arrives at the bottom (point A) at 3...

**Math**

If the measurement from the outer edge of the first board to the outer edge of the last board is 144 inches, then there would be 14 spaces between the boards, each measuring 3/8 inch. (14x3/8)+(15x9 1/4)= 144. Now if this section is in the middle of the boardwalk, there would ...

**math**

(15x1000)/60=250

**science**

For BOD5 test 1) Why water samples needed dilution? 2)How to check the test accuracy? 3)Under what conditions, the water sample needs "seed"? anyone can help?please.

**science**

How to eliminate chloride interference up to the COD test?

**Statistics**

I have two coins: a quarter and a nickel. The quarter has a bias of 1/4 for heads, and the nickel has a bias of 2/3 for heads. I flip each coin 10 times. What is the probability that I observe exactly five heads total? Some explanation of the solution would be appreciated.

**Physics**

i caught you

**algebra**

Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually?

**High School Geometry**

I am have a hard time understanding how A and B can be No, but C can be Yes on this problem i.imgur (dot)com/rpJQDf3.png I thought that since AD is not perpendicular to the plane m then no lines shooting off of D onto the plane could be perpendicular.

**math**

Oh thanks Ms.Sue! :)

**math**

If a car traveled 168 miles in 3.5 hours, what was the average rate of speed?

**math**

Thanks Ms.Sue.... you're awesome!

**Physics**

A 3.00-g bullet (c = 0.0305 cal/g . C° = 128 J / kg . C°) moving at 180 m/s enters a bag of sand and stops. By what amount does the temperature of the bullet change if 80% its KE becomes thermal energy that is transferred to the bullet? Thank ´s fir your help!

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is your percentile?

**Statistics**

Dear Lee, Please confirm these answers to this question. your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is y...

**Statistics**

a. 69 b. 40th percentile

**Statistics**

a. 69 b. 40th percentile

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test:<br /> 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70<br /> a.find the 90th percentile<br /> b. your score was 59, what is your percentile?<b...

**chemistry**

5.34g of salt of formula M2SO4 (M is a metal)were dissolved in water. The sulfate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulfate (BaSO4) were obtained. a)How many moles of sulfate ion were precipitated as barium sulfate? b)How many ...

**Chemistry**

What is the purpose of adding 100 mL of distilled water to a beaker containing metal nitrate solution?

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?

**Physics**

Three sources of sound are distributed along a line, as shown in the figure. v is the speed of sound. Source A is at rest, and it emits sound waves with a frequency of 480 Hz. Source B is traveling at v/5 to the right, and it emits sound waves with a frequency of 960 Hz. Sourc...

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?

**maths simultaneous equations**

3x + 5y = 1 4x + 7y = 2

**Chemistry**

Determine the theoretical and percent yield of hydrogen gas if 80.5 g water undergoes electrolysis to produce hydrogen and oxygen and 2.81 g hydrogen is collected. theoretical yield

**Math**

Value of $100.00 earning 8% compounding interest rate annually at the end of 10 years.

**math**

what percent of 30 is 40?

**physics**

Marks: 1 A car merges onto the highway from rest in 10 seconds. The final speed of the car is 60 mph. Estimate the acceleration of the car.

**Physics**

An trapdoor is 0.91 m square, has a mass of 11 kg, and is hinged along one side with a latch on the opposite side. If the center of mass is located 0.1 m toward the hinged side from the center, what are the magnitudes of the forces on the latch and the hinge from the door?

**Chemistry **

What is the pH of a solution that is 0.0100 M in HCN and 0.0200 M in NaCN?

**Math**

If Ethan ate 4 times as many cookies as Daniel who at 2 times as many as Courtney how many cookies did Ethan eat if Courtney ate 2.

**english**

I really need 6 thick (hard) questions for Act 4 scene 1-3 "King Lear" by Shakespeare PLEASE THANK YOU

**LA**

just tell me please

**LA**

d?

**LA**

is it A?

**LA**

can you help witch one is it?

**LA**

Which description best captures Abraham Lincoln's approach to slavery before he signed the Emancipation Proclamation? A;Lincoln was himself pro-slavery, but thought that states should have the right to choose whether or not slavery was legal. B;Lincoln was indifferent on t...

**LA**

thanks

**LA**

is it A please tell me

**LA**

i think its A or D

**LA**

10. How did the 1860 election contribute to the breakup of the Union? A;by electing a president many believed would not protect Southern rights B;by electing a pro-slavery president whom the North would not tolerate C;by allowing freed slaves to vote D;by electing a president ...

**physical science**

The orbital velocity of an earth satellite in an orbit 400 mi above the earth?

**Chem**

What will be the temperature of a 3.5 gram sample of carbon dioxide gas in a 2.5 liter container at .955 atm

**Physics**

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object. The heavier object will move .8 m down, the lighter will mov...

**Physics**

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and p...

**physics**

but how do you find the initial height?

**physics**

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object.

**chemistry**

What is the percent by volume (% v/v) of a solution made by mixing 12 ml of ethanol (C2H5OH) with 48 ml of water? b) Assuming the density of ethanol is 0.789g/ml, what is the molarity of this solution?

**trig**

cos è = 0.9659 A = ? H = 20

**Biomechanics**

.4040

**math**

The ratio of mystery books to the number of science fiction books is 4:3. The number of sci-fi books to the number of biographies is 4:5. If there are 48 sci-fi books what is the total number of books

**chemistry**

TO HAC SOLUTION (02M 100ml) we add NaOH (0.12M 80ml) what is the ph (answer: 4.71)

**consumer math**

idk how to do it

**Physics**

By what amount will a 178 m long concrete slab on the Mackinac Bridge contract when going from +39C to -35C? The linear expansion coefficient is 10-5 per C.

**problem solving**

You purchased 18 karat gold chain that weights 15 grams. How much gold did you purchase in grams? In carats? (1 carat=0/2 grams)

**problem solving**

Okay I was dividing by 3 instead of 9. Got it now, thanks.

**problem solving**

You need to put a carpet in a rectangular room that measures 13 feet by 22 feet as a cost of $19.50 per square yard. Assuming that you can buy precisely the amount of carpet you need, how much will the carpet for the room cost? Demonstrate step-by-step solution. I got $1,858.9...

**problem solving**

Okay got it. Thank you..

**problem solving**

You wouldn't multiply that answer by 60 ? 36/45 is .8

**problem solving**

Suppose your car gets 36 miles per gallon of gasoline, and you are driving 45 miles per hour. Using unit analysis, find the number of hours it takes to use 1 gallon of gas. I got 48 minutes but I'm not sure.

**problem solving**

Thanks, got it!

**problem solving**

Suppose that two current exchange rates are US $1= 117.9 Japanese yen and 1 Cuban Peso= $.0476. What is the value of 1 peso in Japanese yen?

**problem solving**

Okay I got it now

**problem solving**

I got two different answers from those two different solutions

**problem solving**

Assuming that you breathe once in every 12 seconds, how many breaths do you take in 4 weeks? You must show the use of units.

**problem solving**

Bathtub consumes more water, by 10.88 ft^3

**problem solving**

Suppose water flows from a shower at a rate of 0.38 cubic feet per minute. Do you use more water by taking a 14-minute shower or by filling a bathtub with 0.6 cub yards of water, and by how much? Demonstrate strep-by-step solution.

**physics**

Linc, the 65kg lifeguard, slides down a water slide that is inclined at an angle of 35 degrees to the horizontal, into the community swimming pool. If the coefficient of friction of the slide is 0.050, what is Linc's rate of acceleration as he slides down? -Draw the free b...

**american government**

2. In federalism, the national government (Points : 1)

**ratio and rate**

I think you're missing the point here, Ms. Sue. Math problems do not always have to be scientifically accurate, at least in cases like these.

**Math**

if josh gives Emily 7 apples, she will have 5 times as many apples as Josh. If Emily gives Josh 7 apples, they will have the same number of apples. How many apples does each currently have?

**Math**

You are correct.

**AP U.S. History**

How did the government under the constitution guarantee that people on the frontier would be loyal to it? What was the impact on Native Americans?

**AP U.S. History**

How did the French Revolution highlight the differences between the Federalists and the Republicans?

**AP U.S. History**

What diplomatic problems did the french revolution and the war that followed pose for the united states? How did Washington and Congress deal with this problem?

**Physics**

A small 0.469-kg object moves on a frictionless horizontal table in a circular path of radius 1.42 m. The angular speed is 6.31 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone under...

**physics**

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 68.5-kg man just before contact with the ground has a speed of 5.59 m/s. (a) In a stiff-legged lan...

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