Saturday

January 31, 2015

January 31, 2015

Total # Posts: 2,141

**physics**

A particle, starting from point A in the drawing at a height h0 = 3.2 m, is projected down the curved runway. Upon leaving the runway at point B, the particle is traveling straight upward and reaches a height hf = 4.1 m above the floor before falling back down. Ignoring ...
*December 8, 2011*

**Algebra**

What is the correct significant figures of 14.2 • 8.5 Options: 121 120 100 120.7 also can you explain why the one you picked is correct? Thank you!
*December 6, 2011*

**math equation**

the y intercept is when x=0. so it is y=2. to graph it is easier to find also the x intercept (y=0) and then graph.
*December 3, 2011*

**physics**

A circular disk of mass 0.2 kg and radius 24 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.7 kg and the same radius, rotating freely at 3.4 rad/s. Find the new angular velocity of the combination.
*December 3, 2011*

**math 4th grade**

writing a sequence for the rule a-4=b
*November 29, 2011*

**Mechanics**

At t = 0 s a flywheel is rotating at 30 rpm. A motor gives it a constant acceleration of 0.9 rad/s^2 until it reaches 70 rpm. The motor is then disconnected. How many revolutions are completed at t = 20 s?
*November 28, 2011*

**math**

87=.23x +26 87-26=.23x 61=.23x 265.22=x
*November 27, 2011*

**physics help please**

an air puck of mass m1= 0.25 kg is tied to a string and allowed to revolve in a circle of radius R=1.0m on a frictionless horizontal table . the other end of the string passes through a hole in the center of a table and a mass of m2=1.0kg is tied to it. the suspended mass ...
*November 27, 2011*

**Math**

Because of the Earth’s curvature, a person can see a limited distance to the horizon. The higher the location of the person, the farther the person can see. The distance D in miles to the horizon can be estimated by D(h)=1.22√h, where h is the height of the person ...
*November 25, 2011*

**Math**

I am sorry you feel that way we are all working together in the same class. Thanks anyway.
*November 25, 2011*

**Math**

Find the variation constant in which y varies inversely as x, and the following condition exists. Y=30 when x=1/6 K=
*November 25, 2011*

**Math**

The electrical resistance of a wire is directly proportional to its length. If a 3-foot long wire has a resistance of 1 ohm(s), find the resistance of a 9-foot long wire. What is the resistance?
*November 25, 2011*

**business**

Identify a sacco organization involved in online business
*November 22, 2011*

**Algebra II**

The maximum safe load of a rectangle beam varies jointly as its width and the square of its depth and inversely as the length of the beam. If a beam 8.00 in. wide, 11.5 in. Deep, and 16.0 ft long can safely support 15.000 lb, find the safe load for a beam 6.50 in. Wide, 13.4 ...
*November 21, 2011*

**Algebra II**

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?
*November 21, 2011*

**Algebra II**

If y varies jointly as w and x, and y is 483 when x is 742 and w is 383, find y when x is 274 and w is 756.
*November 21, 2011*

**math**

according to a recent survey 38% of americans get six hours or less of sleep each night. if 75 people are selected to participate in a sleep survey, find the probability that 30 or more of them get six hours of sleep each night
*November 20, 2011*

**physics emergerncyy!**

A particle of mass m1 = 2.5 kg moving along the x axis collides with a particle of mass m2 = 4.7 kg initially at rest. The incoming particle is deflected in the direction 24 degrees above the x axis, whereas the target particle moves off at 14 m/s at 39 degrees below the x ...
*November 19, 2011*

**chemistry**

what is a double replacement precipitation reaction and limiting reactants
*November 17, 2011*

**emergency physics**

A 15 g bullet strikes and embeds in a 2.8 kg block suspended at the end of a 1 m string. After the collision the string rises to a maximum angle of 20 degrees to the vertical. what is the speed of bullet?
*November 16, 2011*

**science**

how many atoms are in a mole?
*November 16, 2011*

**math**

how would you write this word problem as an equation? When the gas gauge on her car was on the 3/8 mark, Karen pumped 15 gal. of gas into the tank in order to fill it. How many gal. of gas does the tank in Karen's car hold?
*November 16, 2011*

**physics emegency!**

so the 7.5 is irrelevant ?
*November 14, 2011*

**physics emegency!**

A 16 kg object with a velocity 7.5 m/s explodes into two equal fragments. One flies off with a velocity 2.5i -2.5j m/s. What is the velocity of the other fragment in vector notation?
*November 14, 2011*

**Calculus**

Let f(x)=3x^5+5x^3+15x+15. Use Rolle's Theorem to show that f(x) has exactly one root.
*November 13, 2011*

**physics**

A 1.5-kg cart is pulled with a force of 7.3 N at an angle of 40° above the horizontal. If a kinetic friction force of 3.2 N acts against the motion, the cart’s acceleration along the horizontal surface will be
*November 12, 2011*

**Chemistry**

the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.55 years?
*November 11, 2011*

**statistics**

A shipping company received an order of 1645 packages. The manager needs to determin the mean weight of the packages. (A) How many randomly selected packages would be need to weight to estimate with a 95% confidence, the mean weight within +/-1.5 pounds if prior studies ...
*November 11, 2011*

**Statistics**

Ticket sales for opening night of a movie have a mean of $2100 with a standard deviation of $450. Assume these ticket sales follow a normal distribution. If a movie is selected randomly, what is the probability that opening night ticket sales are more than $1620?
*November 9, 2011*

**algebra3**

Why isn't the absolute value inequality (x^2-1)</=8 set up as -8<x^2-1<8 yielding -7<x^2<9 so +/-sqrt-7<x<+/-sqrt9 so +/-isqrt7<x<+/-3?
*November 8, 2011*

**Math **

Find the mystery number. Three less than the quotient of the number and five is negative fifty-two.
*November 8, 2011*

**Statistics**

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample means. Assume that ...
*November 8, 2011*

**physics**

A child lifts a 5.0-newton toy to a height of 0.50 meters. How much work is done on the toy?
*November 8, 2011*

**Algebra 3**

Isn't the problem set up as -8<x^2-1<8 so -7<x^2<9 so +/-sqrt-7<x<+/-sqrt9 because it is an absolute problem? /
*November 8, 2011*

**Algebra 3**

Absolute Value (x^2-1)<8, I keep coming up with +/- isqrt7< x < +/- 3 but its wrong.
*November 8, 2011*

**Physics**

Two identical boats travel through still water at 3 m/s. They start from the same point, one travels parallel (and antiparallel) to the current and the other travels perpinducular. It takes one boat twice as long as the other. How fast is the current in the river flowing.
*November 7, 2011*

**PHYSICS HELP**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 6, 2011*

**PHYSICS HELP**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 6, 2011*

**physics**

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is hung on it. C) how ...
*November 6, 2011*

**Algebra 3**

Trying to solve this rational inequality but can't figure how to factor the numerator. ((3x-2x^2)/(4-x^2))<((3+x)/(2-x))
*November 6, 2011*

**MGT 437**

Which one of the following is not a project risk? a)Political Risk b) Department Risk c) Technical Risk d) Schedule Risk e) Production Risk
*November 5, 2011*

**PHYSICS**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 3, 2011*

**Math**

Steve bought 300 shares stock for x dollars per share in 2008. This year he sold the stock for y dollars per share where y<x.He lost on the transaction. is wife Lisa used the formula (y-x)/x to compare the percent of loss. Steve said Lisa was incorrect because she didn'...
*November 3, 2011*

**math**

a phone company wants to create some new area codes. each area code will be 3 numbers . using the digits 1,5,and 7 only once in each code, how many codes can the phone company create?
*November 3, 2011*

**Chem**

In a coffee cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) -----------------> AgCl (s) The two solutions were initially at 22.60 °C, and the final temperature is 23.40 °C. Calculate...
*November 2, 2011*

**physicss help!**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 2, 2011*

**physics**

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with the spring unextended...
*November 2, 2011*

**probability**

carlos shoots a free throw in basketball, what are the chances of making a basket?
*October 31, 2011*

**Math**

a=35 s=50
*October 30, 2011*

**help! physics**

it doesnt work can u help me?
*October 29, 2011*

**help! physics**

A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How do you find the ...
*October 29, 2011*

**physics**

ive been trying that but it doesnt work. for the force i get 4.96 and i find the work with that and its always wrong.
*October 29, 2011*

**physics**

A 1.7 kg block is moved at constant speed over a surface for which the coefficient of kinetic friction is 0.27. The displacement is 2 m. It is pushed by a force directed at 25 degrees below the horizontal. Find the work done on the block by: the force. How do you find the force?
*October 29, 2011*

**alberga**

60*6 DUH!
*October 29, 2011*

**biology**

what is the promoter sequence for transcription? in regards to nucleotides
*October 28, 2011*

**biology**

list two types of active transport that use specific protein recognition
*October 28, 2011*

**math**

5.06 and 5.94
*October 25, 2011*

**comm 100**

if you use literal analogies
*October 25, 2011*

**algebra**

The volume of a pyramid with a rectangular base is V= 1/3 x LWH Find W if V = 500, L = 15, and H = 4.
*October 24, 2011*

**physics**

there is a massless rope that is pulled over a frictionless pulley that is suspended high above the ground one end of the rope is tied to a heavy block with a mass of 483 kg the free end is climbed by a person with a mass of 102 kg who starts from rest. If during the time of ...
*October 22, 2011*

**physics**

At a track-and-field meet, the best long jump is measured as 8.00 m. The jumper took off at an angle of 46° to the horizontal. (a) What was the jumper’s initial speed? (Neglect air resistance.) 1 m/s (b) If there were another meet on the Moon and the same jumper could...
*October 20, 2011*

**Physics**

A car starts from rest and accelerates unifomly at 3m/s^2. A second car starts from rest 6 seconds later at the same point and accelerates uniformly at 5m/s^2. How long does it take the second car to over take the first car?
*October 20, 2011*

**chemistry**

S is Positive
*October 18, 2011*

**Chemistry**

What mass of NaCl is needed to precipitate all the silver ions from 20.0 mL of 0.100 M AgNO3 solution?
*October 13, 2011*

**geometry**

in the diagram below of triangle abc, de is a midsegment of triangle abc, de=7, ab=10, and bc=13.find the perimeter
*October 13, 2011*

**Science**

how much heat is required to change 5 grams of iron to 10c
*October 13, 2011*

**physics**

Mars has a mass of about 6.8 × 1023 kg, and its moon Phobos has a mass of about 9.5 × 1015 kg. If the magnitude of the gravitational force between the two bodies is 4.66 × 1015 N, how far apart are Mars and Phobos?
*October 11, 2011*

**Math (Translate each sentance into a equation)**

the product of Mike's age and 4 is 52
*October 11, 2011*

**CIS 115**

Can someone post an actual answer to this question either with paint or visual logic please?
*October 8, 2011*

**trig**

evaluate the expression below at t=4 p=$400 and r=-9% round youre answer 2 decimal place
*October 7, 2011*

**ochem**

at room temperature is caffeine soluble in water or dichloromethane
*October 6, 2011*

**Calculus**

If f(x)=[(x−1)/(1+5x)], there are two points on the graph of y=f(x) at which the tangent lines are parallel to the line x−2y=2. Type in the x values of these points. Type the smaller number first, then the larger number.
*October 4, 2011*

**science**

Tight junctions prevent the movement of the extracellular matrix between cells. A) True B) False Which one is it please :)
*October 2, 2011*

**science**

Tight junctions prevent the movement of the extracellular matrix between cells. A) True B) False Which one is it please :)
*October 2, 2011*

**calculus**

Piecewise f(x) = { (x^2, x<=2) (mx + b, x>2) I am not sure what the graph would look like for the 2nd function. Any tips on drawing functions like this would be of great help.
*October 2, 2011*

**Statistics**

what is the answer
*October 1, 2011*

**chemistry**

A foundry releases 6.0 tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO2) by wieght. How many pounds of SO2 are released in one week?
*September 30, 2011*

**Physics**

A 1596 kg car traveling at 24.91 m/s skids to a halt. What is the change in the combined thermal energy of the car and the road surface?
*September 29, 2011*

**Physics**

A 1596 kg car traveling at 24.91 m/s skids to a halt. What is the change in the combined thermal energy of the car and the road surface?
*September 28, 2011*

**Physics**

A 50 g ice cube can slide without friction up and down a 32° slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10.16 cm. The spring constant is 22 N/m. When the ice cube is released, what distance will it travel up the slope...
*September 28, 2011*

**Physics**

A 50 g ice cube can slide without friction up and down a 32° slope. The ice cube is pressed against a spring at the bottom of the slope, compressing the spring 10.16 cm. The spring constant is 22 N/m. When the ice cube is released, what distance will it travel up the slope...
*September 28, 2011*

**math**

i need the right answer
*September 28, 2011*

**math**

what is 2+2 equal to?
*September 28, 2011*

**Math 124**

There are several ways you might think you could enter numbers in WebAssign, that would not be interpreted as numbers. N.B. There may be hints in RED!!! You cannot have commas in numbers. You cannot have a space in a number. You cannot substitute the letter O for zero or the ...
*September 28, 2011*

**physics**

Use kinematics to find the time it will take the rock to fall to the ground. (delta)x = V(initial)(time) + .5at^2 (delta)x = 0 + .5(-9.8)t^2 First term drops out because initial velocity is zero. Acceleration is that due to gravity. Negative sign is because it is accelerating ...
*September 25, 2011*

**AP Physics**

By Snell's law, n(incident)sin(theta(incident)) = n(refracted)sin(theta(refracted)) or n(1)sin(theta(1)) = n(2)sin(theta(2)) Solving for theta(2) sin(theta(2)) = [n(1)sin(theta(1))]/n(2) Theta(2) = arcsin [n(1)sin(theta(1))]/n(2) Theta(2) = arcsin ((1)(sin(33.5))/1.33 or ...
*September 25, 2011*

**physics**

some massive butt mud
*September 21, 2011*

**math**

john's high score on the asteroid game was 326,700. mike's high score was 418,200. rebecca just plated the game and her high score was halfway between john's and mike's. what was rebecca's score?
*September 20, 2011*

**Spanish-another question please**

Thank you for all your help
*September 20, 2011*

**Spanish-another question please**

1.If I had a picture of a family having fun in the snow-I'm not sure how to say that-- a.La familia divertirse en la nieve b.La familia se divertir en la nieve c.La familia diviertese en la nieve d.La familia se divierte en la nieve I think it is (a) 2. If a muchacho is ...
*September 20, 2011*

**Spanish**

Could you please check these -thank you 1.How do you say I am going to wake up early I think it is "Yo me voy a despertar temprano" 2. What is another way of saying "Voy a secarme el pelo. Is it "Me voy a secar el pello.
*September 20, 2011*

**PHYSICS**

a=3.14 rads
*September 19, 2011*

**Physics**

The acceleration due to gravity on the moon is about one sixth its value on earth. If a baseball reaches a height of 62 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m
*September 17, 2011*

**algebra**

you rent a car for $55.00 a day. .20 cents a mile , and you pay $80.00 at the end of the day. how many miles did you drive
*September 15, 2011*

**statistics**

You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.8. With water it will die with probability 0.4. You are 87 % certain the neighbor will remember to water the plant. You come back from the vacation and the...
*September 14, 2011*

**Physics**

A ball is thrown straight up and rises to a maximum height of 24 m above the ground. At what height is the speed of the ball equal to half of its initial value? Assume that the ball starts at a height of 1.9 m above the ground.
*September 13, 2011*

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