Friday

October 9, 2015
Total # Posts: 85,766

**world history**

2. There were similarities and differences between the American and French revolutions. Write a paragraph that compares and contrasts these two revolutions. Describe both how they were alike and how they were different.
*October 5, 2015*

**Algebra**

I get it! I thought I would have to use all the points
*October 5, 2015*

**Algebra**

I found three points of the equation x-2y=b which were (4, -2) (0,-4)(-4,-6) But the question further asks to convert the equation of the new line to standard form ax+by=c. I'm so confused. Can anyone please help?
*October 5, 2015*

**PHYSICS**

A 1420-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16930 N on the submarine, as well as a downward resistive force of 1030 N. What is the submarine's acceleration?
*October 5, 2015*

**PHYSICS**

Three forces act on a moving object. One force has a magnitude of 81.2 N and is directed due north. Another has a magnitude of 47.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with ...
*October 4, 2015*

**PHYSICS**

A 103-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is μk = 0.555. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.05 s, what is his initial speed?
*October 4, 2015*

**PHYSICS**

A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a) θ = 15o and (b) θ = 32o.
*October 4, 2015*

**PHYSICS**

A 50.5-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.624 and 0.364, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?
*October 4, 2015*

**Chemistry**

I'm having trouble understanding hybrid atomic orbitals. Could you please explain? Thanks
*October 4, 2015*

**PHYSICS**

Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 88 kg, and the mass of the woman is 58 kg. The woman pushes on the man with a force of 56 N due east. Determine the acceleration (magnitude ...
*October 4, 2015*

**PHYSICS**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
*October 4, 2015*

**History**

The core periphery model is not limited to a global scale Explain What does that mean
*October 4, 2015*

**Physics**

kiln
*October 4, 2015*

**Calculus**

Calculate the approximation. L4, f(x)=cos^2 x , [pi/6, pi/2]
*October 4, 2015*

**Pre-Calculus**

Not sure what to solve... I tried to solve it but i ended up proving that it worked. a. Find the equations of the tangents at C (-2,1) and D (1,2) on the circle x^2+y^2=5 b. Find the point of intersection of the tangents. ~What I did was find the slope and then B, within the ...
*October 4, 2015*

**Chemistry **

Calculate the amount of heat (calories) needed to raise the temp of 10.0g of water from 10.0 c to 75.0 c ??
*October 4, 2015*

**Biology**

Compare and contrast natural selection and artificial selection. All I can think of is that man controls what happens in artificial selection.
*October 4, 2015*

**Biology**

Evolution by artificial selection is a common way by which people breed plants and animals to have characteristics that we find desirable. Imagine that you are working in a lab where scientists are trying to breed a strain of apple that has much higher sugar content. How might...
*October 4, 2015*

**Pre-Calculus**

Oh wow, thank you so much I actually got that, just I didn't know how to continue on from there.. but yay now I know how to!!! Thank you so much, I really thought that equation was impossible. Thanks for making it clear, once again(:
*October 4, 2015*

**Pre-Calculus**

Venus orbits the sun in an approximately circular path. Venus is about 67 million miles from the sun. A comet is located 80 million miles north and 73 million miles west of the sun. The comet follows a straight-line path and exits Venus's orbit at the east most edge. a. ...
*October 4, 2015*

**Pre-Calculus**

Thank you!!! I understand how to do these kinds of problems again. Though I spent nearly 2 hours doing this, it feels all worth it to understand how to actually do it. :) Thank you once again!!!!!!
*October 4, 2015*

**Pre-Calculus**

The cup on the 9th hole of a golf course is located dead center in the middle of a circular green that is 70 ft in diameter. You ball is located 50 feet south, and 40 feet west of the cup. The ball follows a straight line path and exits the green at the right most edge. Assume...
*October 4, 2015*

**algebra**

A 28-inch board is to be cut into three pieces so that the second piece is twicetwice as long as the first piece and the third piece is 44 times as long as the first piece. If x represents the length of the first piece, find the lengths of all three pieces 1st ...
*October 4, 2015*

**factors**

Lucy has 40 bean plants, 32 tomato plants, and 16 pepper plants. she wants to put the plant in rows with only one type of plant in each row. All rows will have the same number of plants. How many plants can Lucy put in each row
*October 4, 2015*

**Econ**

Whenever an industry fails to achieve allocative efficiency by producing too little output, a shortage arises.
*October 4, 2015*

**math**

At a car rental agency, 0.34 of the cars are returned on time. A sample of 13 car rentals is studied. What is the probability that more than 3 of them are returned on time? Write only a number as your answer. Round to 2 decimal places ( for example: 0.24). Do not write as a ...
*October 4, 2015*

**math**

Types of bonds are divided into three categories: good risk, medium risk, and poor risk. Assume that of a total of 13,838 bonds, 7,035 are good risk, 1,388 are medium risk, and the rest are poor risk. One bond is chosen is chosen at random. what is the probability that the ...
*October 4, 2015*

**STAT**

The Probability that a randomly selected commuter listens to audiobooks during their commute is 0.49. Suppose that a sample of 10 commuters is selected, what is the probability that at most 3 of them listen to audiobooks? Write only a number as your answer. Round to 2 decimal ...
*October 4, 2015*

**physical**

Consider a compound microscope that has a minimum separation angle of 0.5 ¦Ìrad when it satisfies the ¡®just resolved¡¯ condition. When its objective lens with a circular aperture is immersed in oil whose refractive index is 1.53, determine ...
*October 4, 2015*

**science**

Two converging lenses are separated by 50 cm, and have focal lengths of f1 = 20 cm and f2 = 10 cm, as illustrated in Figure 2. An object is placed on the left of Lens 1. The final image formed by the two lenses is located at 26.0 cm to the right of Lens 1. (a) Determine the ...
*October 4, 2015*

**math**

Evaluate 2x+6y when x=-4/5 and y=1/3. Write your answer as a fraction or mixed number in simplest form.
*October 4, 2015*

**math**

Evaluate -x+4y when x=-4/5 and y=1/3. Write your answer as a fraction or mixed number in simplest form.
*October 4, 2015*

**Chemistry**

The world’s electrical demand is typically 1.4 x 10^13 W. If all the H2O(g)in the atmosphere suddenly condensed to liquid, and all the enthalpy of this process was captured and converted to electrical energy, for how long would this energy power the world? Assume the ...
*October 4, 2015*

**physics**

A w1 = 255 N bucket is lifted with an acceleration of a = 2.00 m/s2 by a w2 = 105 N uniform vertical chain. A.Find the tension in the top link of the chain. B.Find the tension in the middle link of the chain. C.Find the tension in the bottom link of the chain.
*October 3, 2015*

**college algebra math help**

Laura owns and operates Aunt Linda's Pecan Pies. She has learned that her profits, P(x), from the sale of x cases of pies, are given by P(x) = -x^2 + 14x + 51. a. The company will "break-even" when the profit is zero. How many cases of pies should Laura sell in ...
*October 3, 2015*

**Physics**

A large centrifuge is used to expose aspiring astronauts to accelerations similar to those experienced in rocket launches and atmospheric reentries. a) At what angular velocity is the centripetal acceleration 10 gs if the rider is 10.0 m from the center of rotation? (b) The ...
*October 3, 2015*

**Physics**

A 360 g model rocket is on a cart that is rolling to the right at a speed of 2.5 m/s. The rocket engine, when it is fired, exerts an 8.5 N thrust on the rocket. Your goal is to have the rocket pass through a small horizontal hoop that is 20 m above the launch point. At what ...
*October 3, 2015*

**statistics**

The number of hours per week that the television is turned on is determined for each family in a sample. The mean of the data is 30 hours and the median is 26.2 hours. Twenty-four of the families in the sample turned on the television for 15 hours or less for the week. The ...
*October 3, 2015*

**HELP HELP ap biology**

field of view for 1000x total magnification is it .2 micrometers? help!
*October 3, 2015*

**physics**

A metal ball is thrown vertically upwards from the top of a tower with an initial velocity of 20 metres per seconds. If the ball took a total of 6 seconds to reach ground level, determine the height of the tower.
*October 3, 2015*

**Integration need help also**

Integrate sinx^2.xdx???
*October 3, 2015*

**HELP! HELP ap world history**

i still dont get it
*October 2, 2015*

**HELP! HELP ap world history**

thuycydides posited that political situations recur in similar fashion and the study of history is therefore of great value in understanding the present. in reference to aiding in your developing a historical understanding of world history, what do you think this means? HELP
*October 2, 2015*

**Algebra 2**

Express the product of x+1 and x+8 in standard quadratic form.
*October 2, 2015*

**Language Arts**

Im gonna go with C thank you
*October 2, 2015*

**Language Arts**

ANN PETRY
*October 2, 2015*

**Language Arts**

Which of the following best describes the author’s purpose in “Harriet Tubman”? A. to explain how Tubman taught others to become Underground Railroad conductors B. to explain the path Tubman would take if she conducted the Underground Railroad today C. to ...
*October 2, 2015*

**Language Arts**

Ms.Sue can you help me with this please
*October 2, 2015*

**Language Arts**

Helppp
*October 2, 2015*

**Language Arts**

Since “Harriet Tubman” is in the narrative essay genre, which of the following would be most suitable to add at the end of the piece? A. a summary of the obstacles Harriet endured B. a flashback to Harriet in her childhood C. a scene of Harriet as an elderly woman D...
*October 2, 2015*

**Economics**

How do Positive and Normative Economics affect decision-making?
*October 2, 2015*

**Math OMG Please help**

A wooden access ramp is being built to reach a platform that sits 45 inches above the floor. The ramp drops 3 inches for every 31-inch run. -Write a linear equation that relates the height y of the ramp above the floor to the horizontal distance x from the platform. y=? -Find ...
*October 2, 2015*

**Math**

Earth is represented on a map of a portion of the solar system so that its surface is the circle with equation x squared + y squared + 8x + 6y - 3575=0. A weather satellite circles 0.4 unit above Earth with the center of its circular orbit at the center of Earth. Find the ...
*October 2, 2015*

**Math**

A truck rental company rents a moving truck for one day by charging $22 plus $0.09 per mile. Write a linear equation that relates the cost C, in dollars, of renting the truck to the number x of miles driven. What is the cost of renting the truck if the truck is ...
*October 2, 2015*

**MATH**

When a draftsman draws three lines that are to intersect at one point, the lines may not intersect as intended and subsequently will form an error triangle. If this error triangle is long and thin, one estimate for the location of the desired point is the ...
*October 2, 2015*

**Math**

safasfsafs
*October 2, 2015*

**Chemistry**

1.What is the major difference between the two-dimensional and three- dimensional models of ethane and methane? When might you choose to use a two-dimensional model rather than a three-dimensional model when representing one of the molecules?
*October 2, 2015*

**Mental & Emotional Health**

Shalee is correct
*October 2, 2015*

**Mental & Emotional Health**

What are the answers?
*October 2, 2015*

**MATH**

1 cm= 60 miles 2.6 cm= 60*2.6
*October 2, 2015*

**Math**

Javier rode his bike for a total of 41 minutes. Before lunch, he rode for 1 minute less than 5 times the number of minutes he rode after lunch. How many minutes did Javier ride before lunch?
*October 2, 2015*

**College Algebra **

find all zeros of the function 6x^3+43x^2+6x+7
*October 2, 2015*

**Math**

After leaving the runway, a plane's angle of ascent is 16° and its speed is 267 feet per second. How many minutes will it take for the airplane to climb to a height of 12,500 feet? Round answer to two decimal places. I know the answer is 2.83, but how?
*October 1, 2015*

**Chemistry**

Not sure what 9E3 means. 9000? And is my calculation of 8572.5 gms correct?
*October 1, 2015*

**Chemistry**

The density of water is 1gm/cm^3. Use the density and these dimensions to find the mass of the water in grams in a fish tank. Use the rules of significant figures and rounding to come up with the correct answer. 30 cm width * .075 meters length * 15 inches high I got 8572.5 ...
*October 1, 2015*

**AP Physics**

Question Part Points Submissions Used The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters ...
*October 1, 2015*

**SCI/220**

these relatives do not share the same genetic predisposition for heart disease
*October 1, 2015*

**SCI/220**

You have two relatives both 55 years old and both have always eaten a diet of primarily fast food. One of these relatives has severe heart disease and the other has low cholesterol levels and no sign of heart disease. What is the best explanation for this? these relatives have...
*October 1, 2015*

**Chemistry**

Determine the total grams of Potassium Iodate solution
*October 1, 2015*

**Physics**

n vs. v^2
*October 1, 2015*

**Physics**

897 kg
*October 1, 2015*

**physics **

A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. What force will the smaller magnet exert on the larger magnet?
*October 1, 2015*

**Anonymous**

1) An open sentence can be either true or false depending on what values are used. [Source: Mathisfun] 2) An equation can be made to predict what comes next in a sequence. Suppose y=2x. Y (the term in a sequence) is twice of each value of x we put (1,2,3). From this, we can ...
*October 1, 2015*

**Math**

annie has save $27 of her allowance. she needs $50 to register for a skateboard event this summer . Express the fraction of the registration fee that she has saved as a decimal.
*October 1, 2015*

**filling procedue**

tme wdk uladj jmjm
*October 1, 2015*

**Technology**

Using eireless phones to call people
*October 1, 2015*

**Technology**

Which of the following is an example of a recent development in technology
*October 1, 2015*

**math**

If you have 4,358 students at one school and another school has 3times that many students, how many students are there?
*October 1, 2015*

**Tech**

1-d 2-b 3-a
*October 1, 2015*

**Tech**

Are you serious? Awe, i'm sorry. Questions like these can be so idiotic! I would think these were all right!
*October 1, 2015*

**chemistry**

Oxidizing agents remove electrons. Reducing agents donate electrons. Cl takes away electrons from Ca as seen in the product.
*October 1, 2015*

**Physics**

Oh, I'm sorry. I didn't consider that it was 'sound' I'm working on it. What do I need to find first?
*October 1, 2015*

**Physics**

In air, the distance traveled by a sound wave is 140 meters during 400 vibrations. If the frequency of the tuning fork is 500 Hz, find the velocity of sound in air. Here's what I did: Wavelength= 140/400=0.35 So, velocity= 500*0.35= 175 m/s Am I right?
*October 1, 2015*

**Chemistry**

you are a public health officer in the water treatment facility for a city of 50,000 people . A concentration of 1.0 ppm of fluoride in the drinking water is sufficient for the purpose of helping to prevent tooth decay. The compund normally chosen for fluoridation is the same ...
*October 1, 2015*

**physics**

A superhero flies 172 m from the top of a tall building at an angle of 23 ◦ below the horizontal. What is the horizontal component of the superhero’s displacement? Answer in units of m.
*October 1, 2015*

**physics**

A truck travels up a hill with a 13◦ incline. The truck has a constant speed of 18 m/s. What is the horizontal component of the truck’s velocity? Answer in units of m/s
*October 1, 2015*

**physics**

While following the directions on a treasure map, a pirate walks 37.8 m north, then turns and walks 5.2 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m. 004 (part 2 of 2) 10.0 ...
*October 1, 2015*

**physics**

At what angle with the north would he have to walk? Answer in units of ◦ .
*October 1, 2015*

**physics**

While following the directions on a treasure map, a pirate walks 37.8 m north, then turns and walks 5.2 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m.
*October 1, 2015*

**chemistery**

a balloon contains 3.86 L of argon at a temperature of 45 Celsius, what would the volume at 80 celsius
*October 1, 2015*

**Math**

Which one is greater! 59.875 or 59.78 Which symbol? (>,<, or =)
*October 1, 2015*

**Math**

particles move at x=2sin(t), y=3cos(t),z=t at any t>0. What is the accelaration and jerk
*October 1, 2015*

**Math**

joe needs to construct a fence that is 75 yards long and 40 yards wide the arra also needs to be divided into 3 equal sections how many yards of fencing will be needed?
*October 1, 2015*

**sat**

A fence consist of sections built in a row. the figure above shows the first two sections of the fence. each section is identical and consists of two horizontal boards between consecutive vertical posts. each post cost $ 8 and each board coat $6. If the total cost of the ...
*September 30, 2015*

**Physic**

A Coast Guard ship is traveling at a constant velocity of 4.13 m/s, due east, relative to the water. On his radar screen the navigator detects an object that is moving at a constant velocity. The object is located at a distance of 3900 m with respect to the ship, in a ...
*September 30, 2015*

**Chemistry**

But it is saying the soecifc gravity of 25.0 mL of the liquid so the density changes. That's what threw me off... It wouldn't equal the density
*September 30, 2015*

**Chemistry **

Suppose the density of 100.0 mL of some liquid was found to be .78 g/mL . What would be the specific gravity of 25.0 mL of the liquid?
*September 30, 2015*

**Chemistry **

Mary was determining the density of a metal cylinder. When recording the diameter, she mistakenly recorded a number that was too small. Will her calculated value for density be too high or too low? Explain
*September 30, 2015*

**math for managers**

Cost analysis Te owner of a small construction busi-ness needs a new truck. He can buy a diesel truck for $38,000 and it will cost him $0.24 per mile to operate. He can buy a gas engine truck for $35,600 and it will cost him $0.30 per mile to operate. Find the number of miles ...
*September 30, 2015*

**Biology**

Synthesis means the process by which simple compounds are united to form more complex materials. Dehydration means loss of water. Explain why chemists refer to the joining of monosaccharide molecules to form disacchardies as dehydration synthesis reaction
*September 30, 2015*