Monday

August 31, 2015
Total # Posts: 83,675

**Physics**

Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 8.1 x 1028 kg and 1.7 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would...
*August 16, 2015*

**physics**

compare your average speed in the following cases. a. you walk 73.2 m at a speed of 1.2 m/s and then run 73.2 m at a speed of 3.1 m/s along a straight track. b. you walk 1 min. at a speed of 1.2 m/s and then run for 1 min. at 3.1 m/s along a straight track.
*August 16, 2015*

**math**

,where n is a real number.
*August 16, 2015*

**math**

Given z=cos*(delta)+j sin*(delta),show that z^n+1/(z^n)=2cos*n*(delta)
*August 16, 2015*

**Calculus **

As x goes to zero, what is the limit of (( 1/ x+2) -(1/2)) / x? I know the answer is -1/4, but I'm confused on how to get that answer. I think I have to multiply by the reciprocal.
*August 15, 2015*

**Afro**

I wants its solution
*August 15, 2015*

**calc**

A particle moves along the x-axis with velocity v(t) = t^2 − 1, with t measured in seconds and v(t) measured in feet per second. Find the total distance travelled by the particle from t = 0 to t = 2 seconds.
*August 13, 2015*

**Math**

Thanks. :)
*August 13, 2015*

**Math**

Bob works 1 1/2 hours per day and is payed $7 per hour. He works five days a week. How much money does he earn in 7 weeks? My answer is $367.50, am i correct?
*August 13, 2015*

**Math**

alright thanks!
*August 13, 2015*

**Math Probability **

An ant begins at the top of the pictured octahedron. If the ant takes two "steps", what is the probability it ends up at the bottom of the octahedron? Assume a "step" is a journey from one vertex to an adjacent vertex along an edge.
*August 13, 2015*

**Math Probability **

Mario, Yoshi, and Toadette play a game of "nonconformity": They each choose rock, paper, or scissors. If two of the three people choose the same symbol, and the third person chooses a different symbol, then the one who chose the different symbol wins. Otherwise, no ...
*August 13, 2015*

**math**

Write the number 1100 and two ways
*August 13, 2015*

**Physics**

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway? I'm not sure how to set up the problem.
*August 12, 2015*

**Physics**

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway? I'm not sure how to set up the problem.
*August 12, 2015*

**Math**

For every $4 Halle saves her brother saves $7 determine. Ratio
*August 12, 2015*

**math**

The difference between two numbers is 4 and their sum is -7. What is their product?
*August 12, 2015*

**Math**

Twice the sum of the digits of a positive, two-digit integer is 19 greater than the ones digit. Reversing the digits decreases the number by 18.
*August 12, 2015*

**Math**

If j / k = 32 and k = 3 / 2, what is the value of 1 / 2 j?
*August 12, 2015*

**life orientation**

assess the extent to which bad road use has a direct impact on the physical emotional social and economic aspects to the family the community and the country
*August 12, 2015*

**Math**

t + y = 15 t + y / 2 = 15 2 * t + y / 2 = 15 *2 t + y = 30 w + x = 15 w + x / 2 = 15 2 * w + x / 2 = 15 * 2 w + x = 30 t + y + w + x / 4 30 + 30 / 4 60 / 4 15
*August 12, 2015*

**Math**

The average (arithmetic means) of t and y is 15, and the average of w and x 15. What is the average of t, w, x, and y? (A) 7.5 (B) 15 (C) 22.5 (D) 30 (E) 60
*August 12, 2015*

**Math**

I'm sorry I figured out what I did wrong. (x - 2)^2 = 49 (x - 2) (x - 2) = 49 x^2 - 2x - 2x + 4 = 49 x^2 - 4x + 4 = 49 x^2 - 4x + 4 - 49 = 49 - 49 x^2 - 4x - 45 = 0 (x + 5) (x - 9) = 0 Solution is {-5} , {9}, Answer choice E
*August 12, 2015*

**Math**

If (x - 2)^2 = 49, then x could be (A) -9 (B) -7 (C) 2 (D) 5 (E) 9 (x - 2)^2 = 49 (x - 2) (x - 2) = 49 x^2 - 2x - 2x + 4 = 49 x^2 - 4x + 4 - 4 = 49 - 4 x^2 - 4x = 45 I am not sure what to do from here.
*August 12, 2015*

**algebra 1a**

X-200
*August 11, 2015*

**Maths**

Let ABC be a triangle. Locate the point O inside the triangle ABC such that for points L, M and N lying on its sides AB, BC and CA respectively, triangles BOL, COM and AON have the same area, where LO and BC, OM and AC, NO and AB must be parallel respectively.
*August 11, 2015*

**Math**

subtract them, just like you added: 4x + 10 - (-5x +20) The minus turns (-5x + 20) into the opposite, or 5x - 20 4x + 10 + 5x - 20 9x - 10
*August 11, 2015*

**DC/AC Electronics**

In a series RL circuit, the highest component voltage drop will be across the component with the _ resistance or reactance.
*August 11, 2015*

**need help**

thank you
*August 11, 2015*

**need help**

There are 205 students in the middle school. If 41 students are girls in 8th grade, what percent of the middle school do the girls in 8th grade represent?
*August 11, 2015*

**art**

A anger b excitement c sorrow d content
*August 11, 2015*

**art**

Thanks to the use of art, this artist was able to communicate the feeling of
*August 11, 2015*

**Chemistry**

if the rate of a certain reaction is 6M/hr at 273K, what would be the predicted rate at 278k with activation 30kj/mol
*August 11, 2015*

**ITT**

In the following diagram, a ray of light is incident on an air-glass boundary. The index of refraction of air is 1, and the index of refraction for the glass is 1.4. What is the angle of the reflected ray, and what is the angle of the refracted ray?
*August 11, 2015*

**physics **

a sled is moving up a slope that makes an angle θ of 5.00◦ with respect to the horizontal. The coefficient of kinetic friction between the sled and the snow is μk = 0.0500. What is the magnitude of the acceleration of the sled as it moves up the slope?
*August 11, 2015*

**physics**

The drawing shows a skateboarder moving at 6.87 m/s along a horizontal section of a track that is slanted upward by 51.9 ° above the horizontal at its end, which is 0.616 m above the ground. When she leaves the track, she follows the characteristic path of projectile ...
*August 11, 2015*

**physics**

A person is trying to judge whether a picture (mass = 1.64 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.700. What is the minimum ...
*August 11, 2015*

**Maths**

We have Rs.100/-.If we spend Rs.100/-and balance is Rs.102/-,show how is Rs.2/-extra
*August 10, 2015*

**Math**

Thank you Ms.Sue (:
*August 10, 2015*

**Math**

13 less than 30 as a numerical expression
*August 10, 2015*

**geometry**

Jason designed an arch made of wrought iron for the top of a mall entrance. The 11 segments between the two concentric circles are each 1.25 m long. Find the total length
*August 10, 2015*

**computer**

thank you
*August 10, 2015*

**Math**

How many even, three-digit positive integers have the property that two of the digits are equal, but not all three are equal?
*August 10, 2015*

**Math**

The distance s in feet that a body falls in t seconds is given by the formula s=16t^2. If a body has been falling for 5 seconds, how far will it fall during the 6th second
*August 10, 2015*

**Math**

A card is randomly drawn from a standard $52$-card deck. An ace of hearts wins the grand prize; any other ace or heart wins a small prize. What is the probability of winning a small prize? Express your answer as a common fraction. Assume that a grand prize winner does NOT ...
*August 10, 2015*

**Health**

lifestyle choices and health awareness affect your position on the health
*August 10, 2015*

**English**

what social and political developments predicted in 1984 by George Orwell seem to have come true i our present society? Please include any examples, thank you!
*August 10, 2015*

**Health**

Which of the following secondary sex characteristics develop during the teen years?
*August 10, 2015*

**Physics**

I= torque/angular accleration = 32Nm/25rad/s^2=1.28 kg/m^2
*August 10, 2015*

**physics**

a plane travelling at 200.0m/s braked to a stop in 6.2s. what was its acceleration?
*August 10, 2015*

**math**

Two cars leave Phoenix and travel in the same direction. One car travels 4/3 times as fast as the other. After 6 hours they are 90 miles apart. What are the rates of the cars?
*August 10, 2015*

**math**

A plane flies 540 miles for 2 hours in the direction of the wind. Then it turns around and flies 690 miles for 3 hours against the same wind. Find the speed of the plane in still air and the wind speed.
*August 10, 2015*

**math**

John and Allen are bicycle riders that are currently 30 miles apart on a certain trail. If they leave at the same time and travel in the same direction, John overtakes Allen in 6 hours. However, if they leave at the same time but travel toward each other, they meet in 1 hour. ...
*August 10, 2015*

**math**

Determine the number of pounds of nuts selling for $6 per pound and raisins selling for $3 per pound that should be combined to create 60 pounds of a trail mix selling for $5 per pound.
*August 10, 2015*

**math**

Determine the number of pounds of nuts selling for $6 per pound and raisins selling for $3 per pound that should be combined to create 60 pounds of a trail mix selling for $5 per pound.
*August 10, 2015*

**Physics**

If the distance between the Earth and the moon is around 380,000km, doesn't 4,678km (assuming it is from the Earth) seem a bit too small? Earth is a much larger body than the moon, so the point where the gravity of the moon and the gravity of the Earth equal each-other (ie...
*August 9, 2015*

**Physics**

i used both both masses and the distance to the moon
*August 9, 2015*

**Physics**

i got a similar answer how did you work it out?
*August 9, 2015*

**math**

i dont get the formula
*August 9, 2015*

**math**

If a^2=b/c, than c^2=
*August 9, 2015*

**Math**

the 3 smallest primes are 2,3,5. So, 2*3*5=30 is the smallest number divisible by 3 primes. But we want a 3-digit number 100 = 2^2 * 5 - nope only 2 primes 101 is prime - only one prime divisor 102 = 2*3*17 - we have a winner!
*August 9, 2015*

**Math**

Kathy spent 1/3 of her money. On a wallet and 1/4 of the remainder on abelt what fraction of her money did she spend on the belt what fraction as let after buying the belt and wallet
*August 9, 2015*

**math PLEASE HELP**

since M is the midpoint of AD, the altitude to M is half the altitude of ABCD. The triangles have the same bases as ABCD, so the sum of the two triangles is half the area of the trapezoid.
*August 9, 2015*

**Math**

What is the GREATEST number of pictures each 2.5-inches by 3.5-inches, that a photographer can print on an 8-inch by 10-inch piece of sensitized paper? Isn't the answer supposed to be 4, because once you cut it you cannot put it back together. Please tell me how i'm ...
*August 9, 2015*

**Math**

How many cubic yards of concrete are needed to make 1200 square concrete posts 9-inches by 9-inches by 6-feet?
*August 9, 2015*

**physics**

A 50.9-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.526 and 0.311, 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?
*August 9, 2015*

**physics**

A golfer hits a shot to a green that is elevated 2.70 m above the point where the ball is struck. The ball leaves the club at a speed of 19.0 m/s at an angle of 36.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
*August 8, 2015*

**Trig**

cos 13 pi = ?
*August 8, 2015*

**physics**

A 50.9-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.526 and 0.311, 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?
*August 8, 2015*

**math**

Not sure what you want to do with that. We can express y as a function x: ln(y+1)+ln8 = x + lnx ln (y+1)*8 = x + lnx (y+1)*8 = e^(x + lnx) 8(y+1) = e^lnx * e^x 8(y+1) = x e^x y+1 = 1/8 x e^x y = 1/8 x e^x - 1
*August 8, 2015*

**physics**

A swimmer, capable of swimming at a speed of 1.81 m/s in still water (i.e., the swimmer can swim with a speed of 1.81 m/s relative to the water), starts to swim directly across a 2.29-km-wide river. However, the current is 1.31 m/s, and it carries the swimmer downstream. (a) ...
*August 8, 2015*

**physics**

A golfer hits a shot to a green that is elevated 2.70 m above the point where the ball is struck. The ball leaves the club at a speed of 19.0 m/s at an angle of 36.0˚ above the horizontal. It rises to its maximum height and then falls down to the green. Ignoring air ...
*August 8, 2015*

**Microeconomics**

A firm currently uses 40,000 workers to produce 180,000 units per day. The daily wage per worker is $100, and the price of the firm’s output is $28. The cost other variable input is $500,000 per day. (Note assume that output is constant at the level of 180,000 units per ...
*August 8, 2015*

**sales**

are interested in buying a new car and Bob let's you borrow one of the new cars on his lot for a week to test drive. You decide you like the car and when you visit Bob to drop off the car, he hands you the following document and a pen: May 1, 201x I promise to pay to the ...
*August 8, 2015*

**math**

6 2/3 = 20/3, not 20/15 so, what you have is 20/3 + 19/35 = 100/15 + 19/15 = 119/15 = 7 14/15
*August 8, 2015*

**Math**

ln ((y-9)/7) = x + lnx (y-9)/7 = e^(x+lnx) = e^x * e^lnx = x e^x y-9 = 7x e^x y = 7xe^x + 9
*August 8, 2015*

**Medical Billing**

You're a coder who's reviewing the record of a 62-year-old woman who was admitted to the hospital with shortness of breath and minor chest pain. The doctor diagnosed the patient with Staphylococcus aureus pneumonia and you assigned a code of 482.41. Additionally, you ...
*August 8, 2015*

**Math**

generate random numbers from 1 to 6. (Roll a die) Roll the die 100 times or so and see what happens. Then analyze your results.
*August 8, 2015*

**Math**

peter is a-8 in 9 years, (a-8)+9 + a+9 = 76
*August 8, 2015*

**wits**

|C| = √(75^2=95^2) direction of C is θ where tanθ = 95/75
*August 8, 2015*

**wits**

Vector A has magnitude of 75 units and points in the positive x direction.vector C = A+B points points in the y direction and has magnitude of 95m.(a) sketch vector A; B & C. (b) Estimate the magnitude & direction of vector B. (c) verify your estimate in part (b) with ...
*August 8, 2015*

**Math**

see Laguerre polynomials
*August 8, 2015*

**Topology**

Let (X,d) be the discrete metric space and let S be a infinite subset of X. Create a proof that S is non-compact in X. Thanks.
*August 8, 2015*

**math**

since 2 is the only even prime, and the sum is odd, the other number must be 1983. If any two primes other than 2 are added, their sum is even, since they must both be odd.
*August 8, 2015*

**math**

the difference between two prime numbers is 1985 the larger of these prime numbers is what
*August 8, 2015*

**math**

How many different pairs of parallel edges are there on a rectangular solid?
*August 7, 2015*

**physics**

A pole of infinite length is planted vertically on the ground. A stone is placed at a distance of 'd1' meters from the pole towards the right. A bird is sitting on the ground exactly in the middle of the pole and stone. The bird flies away towards the right in such a ...
*August 7, 2015*

**Math**

In right triangle ABC above, segment DE is drawn from side AB to AC as shown, forming right triangle ADE. If BC is 24, AB is 12, and BD is 4, what is the length of DE? A.18 B.16 C.15 D.12 E.8
*August 7, 2015*

**Math**

Nope. Leap years have 366 days, which is 52 weeks plus 2 days.
*August 7, 2015*

**Scrambled Paragraph**

lol
*August 7, 2015*

**Maths**

An army cook used 500ml of oil in working for 6 soldiers. How many liters of oil would be required for 480 soldiers?
*August 7, 2015*

**Maths**

what do you want? The integral from 6.5 to 8? That would be 4-5-8 = -9
*August 7, 2015*

**economics**

Suppose you are a stock market analyst specializing in the stocks of theme parks, and you are examining Disneyland’s stock. The Wall Street Journal reports that tourism has slowed down in the United States. At Six Flags Magic Mountain in Valencia, California, a new Viper ...
*August 7, 2015*

**Physics **

a 50 g marble is released from a height 1 m above the floor. Calculate its momentum just before hitting the ground
*August 7, 2015*

**math**

The base of the triangle is 17. The other two sides are integers and one of the sides is twice as long as the other. What is the longest possible length of the side of the triangle.
*August 6, 2015*

**technology**

which of the following sentences is written in the active voice
*August 6, 2015*

**Languages Art **

Which f the following is not part of the rising action in "Raymond's run"
*August 6, 2015*

**chemistry**

Calculate the pH at the equivalence point in titrating 0.110 M solutions of each of the following with 8.0×10−2 MNaOH. Part A hydrobromic acid (HBr)
*August 6, 2015*

**math**

(tan^2x+1)cot2x=2-sec^2x
*August 6, 2015*