Friday
October 9, 2015

# Posts by Anonymous

Total # Posts: 85,754

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

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
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

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
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
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

math
I dont know
September 30, 2015

math
Kim has a balance of -20.59 in her account. Her bank requires a minimum balance of 40.00 How much does kim need to deposit in order to have a 40.00 balance
September 30, 2015

Physics
A "swing" ride at a carnival consists of chairs that are swung in a circle by 17.4 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 291 kg. (a) Determine the tension in the cable attached to ...
September 30, 2015

Multivariable calculus
Find dy/dx x=te^t y=t+sint
September 30, 2015

Physics
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train ...
September 30, 2015

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