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October 20, 2014

Posts by Rachel


Total # Posts: 1,207

physics ...plzzzz help...
ya i m sorry ...i wrote the wrong expression by mistake
May 28, 2012

physics ...plzzzz help...
thank you ...so much..
May 28, 2012

physics ...plzzzz help...
1 ) If the mass of the Moon is 7.4 x 1022 kg and its radius is 1.74 x 106 m, compute the speed with which an object would have to be fired in order to sail away from it, completely overcoming the Moon’s  gravity  pull. 2 ) Show that if a satellite orbits very ...
May 28, 2012

Math
write the equation of the circle in standard form. find the center, radius, intercepts, and graph the circle. x^2+y^2-6x-8y+25=36
May 27, 2012

Physics
A particle travels counterclockwise around the origin at constant speed in a circular path that has a diameter of 2.50 m, going around twice per second. Point Q is on the path halfway between points P and R, which lie on the x axis and the y axis, respectively. State the ...
May 25, 2012

Physics
A particle travels counterclockwise around the origin at constant speed in a circular path that has a diameter of 2.50 m, going around twice per second. Point Q is on the path halfway between points P and R, which lie on the x axis and the y axis, respectively. State the ...
May 25, 2012

Geometry
Find the distance between the given points. (2, 7, −10) and (11, 4, 0)
May 24, 2012

Geometry
A gardener wants the three rosebushes in her garden to be watered by a rotating water sprinkler. The gardener draws a diagram of the garden using a grid in which each unit represents 1 ft. The rosebushes are at (1, 3), (5, 11), and (11, 4). She wants to position the sprinkler ...
May 20, 2012

Geometry
fallen*
May 15, 2012

Geometry
A dead tree was struck by lightning, causing it to fall over at a point 10 ft up from the base of the tree. If the fall treetop forms a 40 angle with the ground, about how tall was the tree originally?
May 15, 2012

Algebra 2
5+(-5/2)+(5/4) Sn=189 Find n for the given sum if the geometric series
May 7, 2012

Algebra 2
Write the series with summation notation 3+9+19+33+51+73 I'm not sure what the equation would be. Would this situation have two equations and if so how would that look like in summation notation
May 7, 2012

beginning spanish
yes or yo se historia
May 7, 2012

math
Solve the system by graphing. Where necessary, indicate when the system has no solution or infinitely many solutions. y = –2x – 4 –2y = 4x + 8
May 6, 2012

Geometry
A special lottery is to be held to select the student who will live in the only deluxe room in a dormitory. There are 100 seniors, 150 juniors, and 200 sophomores who applied. Each senior's name is placed in the lottery 3 times; each junior's name, 2 times; and each ...
May 3, 2012

SOCIAL STUDIES URGENT
1. reeds 2. eastern rain forest 3. suspension bridges
April 30, 2012

SOCIAL STUDIES PLZZ HELP
1. Brasilia 2. the indigenous way of life. 3. Salvador Just got 100% :)
April 30, 2012

Physics
please i need help with this question. Initailly at rest, a car (mass=1300kg) accelerates north from a set of traffic lights at a constant rate for 10s. 11s after starting to accelerate it crosses an intersection and is hit by a second car (mass=1224kg) heading west at 65k/h. ...
April 26, 2012

Accounting
What types of cost information are reported to support managerial purposes and decisions? Describe 2 major categories of purposes that are supported by cost information. Describe how cost information supports both of these categories. What is a cost object and how is it used ...
April 21, 2012

physics
Sam, whose mass is 82 {\rm kg}, takes off across level snow on his jet-powered skis. The skis have a thrust of 240 {\rm N} and a coefficient of kinetic friction on snow of 0.11. Unfortunately, the skis run out of fuel after only 15 {\rm s}.
March 27, 2012

physics
1.3 m/s^2 upward
March 25, 2012

Statistics
What does mu represent for this problem?
March 15, 2012

Statistics
A coffee company wants to make sure that there coffee is being served at the right temperature. If it is too hot, the customers could burn themselves. If it is too cold, the customers will be unsatisfied. The company has determined that they want the average coffee temperature...
March 15, 2012

physics
Square Root
March 15, 2012

english 11
so are any of these right????
March 14, 2012

Chemistry
how do I balance the following skeleton redox equation for a reaction occurring in acidic solution. HNO2 + MnO4- yield to Mn2+ + NO3-
March 12, 2012

physics
John Johnson set a world record for the "100.0" m run with a time of 9.86 s. If, after crossing the finish line, John walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0m?
March 12, 2012

physics
John Johnson set a world record for the "100.0" m run with a time of 9.86 s. If, after crossing the finish line, John walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0m?
March 12, 2012

trigonometry
If a planet has a semimajor axis of 2 AU (astronomical units) a) what would the semimajor axis of a superior planet be if the angle of greatest elongation for the inferior planet is 20 degrees as viewed from the superior planet? b) assuming a day on the superior planet is 30 ...
March 11, 2012

Chemistry
A base has a Kb of 2.5 x 10–11. Which of the following statements is true? This is a concentrated base. This base ionizes slightly in aqueous solution. This is a strong base. An aqueous solution of this base would be acidic.
March 9, 2012

physics
A hot-air balloon is rising upward with a constant speed of 2.50 m/s. When the balloon is 3.00 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground?
March 9, 2012

math
what is the prime factorization of 63?
March 6, 2012

Medical billing and coding
Thank you that helps a lot.
March 6, 2012

Medical billing and coding
compare and contrast contributory negligence with comparative negligence.
March 6, 2012

physics
thanks
March 3, 2012

physics
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do...
March 3, 2012

Math
Assume that the Earth is spherical and recall that latitudes range from 0° at the Equator to 90° N at the North Pole. Consider Dubuque, Iowa (42.50° N latitude), and Guatemala City (14.62° N latitude). The two cities lie on approximately the same longitude. Do ...
March 3, 2012

Finance
A firm has an opportunity to invest in a new device that will replace two of the firm’s older machines. The new device costs $570,000 and requires an additional outlay of $30,000 to cover installation and shipping. The new device will cause the firm to increase its net ...
February 29, 2012

Physics
A 1 kh pendulum os pulled sideways so that it is raised a vertical distance of 2 m above it's resting point. Find the max. Speed the pendulum reaches after being vertical
February 27, 2012

Math
2x+y=12 3x-y=13 Please help me solve the system of equation and show your work.
February 27, 2012

Math
Jillian must average at least 90 on two quiz scores before she can move to the next skill level. Jillian got a 92 on her first quiz. What scores could Jillian get on her second quiz in order to move to the next skill level? Please help me and show your work thanks
February 27, 2012

physics
A uniform ladder 10.0 m long is leaning against a frictionless wall at an angle of 60.0° above the horizontal. The weight of the ladder is 21.8 lb. A 57.8-lb boy climbs 4.38 m up the ladder. What is the magnitude of the frictional force exerted on the ladder by the floor?
February 26, 2012

Math
a+s=1970 8a+5s=12220 Please help me solve the system of equation and show your work thanks
February 25, 2012

physics
At 1:00 p.m. a car, traveling at a constant velocity of 86 km/h toward the west, is 22 km to the west of our school. How far from the school will it be at 3:30 p.m.? Answer in units of k
February 23, 2012

chemistry
How much HCL would be needed to neutralize 250mL of 6 M NaOH (HCL = 1.5 M)?
February 23, 2012

physics
A water balloon was dropped from a high window and struck its target 3.9 seconds later. If the balloon left the person's hand at -8.4 m/sec, what was its velocity on impact?
February 16, 2012

Physics
King Kong carries Fay Wray up the 321 m tall Empire State Building. At the top of the skyscraper, Fay Wray’s shoe is knocked off with an initial upwards velocity of 5.1 and falls towards the ground. With what final velocity will the shoe be moving when it hits the ground?
February 16, 2012

Physics
You are hiking out in California and come across an abandoned mine shaft. Wondering how deep the mine shaft is you toss a rock in and it takes 5.1 seconds before hitting the bottom. How deep is the mine shaft in meters?
February 16, 2012

Finite Math
Assume that you randomly select 8 cards from a deck of 52. What is the probability that all of the cards selected are hearts?
February 15, 2012

Geometry
Two sides of a rhombus form a 120º angle. The length of each side is 6 in. Explain how to find the area of the rhombus, and then calculate the area. Leave your answer in simplest radical form.
February 14, 2012

Geometry
Two sides of a rhombus form a 120º angle. The length of each side is 6 in. Explain how to find the area of the rhombus, and then calculate the area. Leave your answer in simplest radical form.
February 13, 2012

Geometry
The lengths of three sides of a triangle are given. Describe each triangle as acute. right. or obtuse. 5, 6,10.
February 12, 2012

geometry
The lengths of three sides of a triangle are given. Describe each triangle as acute. right. or obtuse. square root 5, 3, square root 14.
February 12, 2012

chemistry
how do i find polyatomic ions?
February 9, 2012

Chemistry
Why do metals tend to be malleable?
February 3, 2012

history
That answer is not correct.
February 2, 2012

physics
A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.9° with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.3 kg, and the coefficient of kinetic friction...
January 28, 2012

physics
The initial velocity of a 2.56 kg block sliding down a frictionless inclined plane is found to be 1.13 m/s. Then 1.08 s later, it has a velocity of 3.99 m/s.What is the angle of the plane with respect to the horizontal?
January 28, 2012

physics
Two blocks of mass m = 14.9 kg each are fastened to the ceiling of an elevator,The elevator accelerates upward at a = 1.62 m/s2. Find the tension in the bottom rope and the top of the rope.
January 28, 2012

physics
An elevator (cabin mass 540 kg) is designed for a maximum load of 3500 kg, and to reach a velocity of 4 m/s in 3 s. For this scenario, what is the tension the elevator rope has to withstand?
January 28, 2012

physics
A 3.24 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=11.8N at an angle theta=23.0degrees above the horizontal, as shown. What is the magnitude of the acceleration of the block when the force is applied? b.) What is the horizontal...
January 28, 2012

physics
A 3.24 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=11.8N at an angle theta=23.0degrees above the horizontal, as shown. What is the magnitude of the acceleration of the block when the force is applied?
January 28, 2012

physics
A professor drives off with his car (mass 840 kg), but forgot to take his coffee mug (mass 0.37 kg) off the roof. The coefficient of static friction between the mug and the roof is 0.7, and the coefficient of kinetic friction is 0.4. What is the maximum acceleration of the car...
January 28, 2012

physics
A professor drives off with his car (mass 840 kg), but forgot to take his coffee mug (mass 0.37 kg) off the roof. The coefficient of static friction between the mug and the roof is 0.7, and the coefficient of kinetic friction is 0.4. What is the maximum acceleration of the car...
January 28, 2012

physics
An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.65. If it comes to rest after 0.9 seconds, what was its initial velocity?
January 28, 2012

physics
An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.55. If its initial velocity is 4.1 m/s, how long does it take for the object to come to rest?
January 28, 2012

math
Factor the given expression. a) 6y^2 − 53y − 9 b) Set the expression equal to zero and solve for y. y= (smaller value) y= (larger value)
January 27, 2012

Honors Algebra 3-4
can the cubed root of 15x^2, over 3 be simplified any more. (original problem: cubed root of 5/3x) the directions were to rationalize the denominator of each expression. Thankss!!!!!
January 24, 2012

Algebra 1
Find the greatest common factor of 12x^2+18x-36
January 17, 2012

physics
At 1:00 p.m. a car, traveling at a constant velocity of 98 km/h toward the west, is 19 km to the west of our school. How far from the school will it be at 3:30
January 15, 2012

Chemistry
Determine the volumes of 1 M acetic acid and 1 M NaOH required to make a 200mL 0.1 M buffer with a pH of 5.5. (Assume the pKa of acetic acid is 4.76).
January 15, 2012

algebra
Including a 9% sales tax, an inn charges $127.53 per night. Find the inns nightly cost before tax is added
January 14, 2012

algebra
Club A offers a starter fee for $17 plus a monthly fee of $11. Club B offers a starter fee of $23 and a monthly fee of $14. How many months untill the prices will be the same?
January 14, 2012

math
f:(x)= x^2+5 find f(0)
January 12, 2012

trig
evaluate sin (11pi/6) to the nearest thousandth.
January 11, 2012

math
a+4(6a+2b^2)+(a^2-6b^2)
January 5, 2012

algebra 1
Maria sells paintings in an art gallery. She ears $375 each week plus a commission equal to 2.5% of her sales. This week her goal is to earn at least $500. What is the minimum amount of sales she must have this week to achieve her goal?
January 5, 2012

Physics
is it possible to solve without the initial temperature of the copper?
January 5, 2012

Physics
A 500 g glass beaker is in thermal equilibrium with 100 ml of 20 Degrees celsius water in it. If a 5 g sample of copper is placed into the water and the system is allowed to come into thermal equilibrium, what will the final temperature of the system be? (assuming no heat loss...
January 5, 2012

Chemistry
5 - got it
January 4, 2012

Chemistry
How would you make an irreversible isothermal expansion/compression cycle of a gas closer to a reversible one? 1. Increase the temperature 2. Decrease the number of steps during expansion and compression 3. Increase the difference between internal and external pressures 4. ...
January 4, 2012

algebra 1
Which expression is the greatest common factor of (125t^3 m^5+60t^4 m^4+85t^5 m^2)
January 4, 2012

Science
pressure=100N/20M/S
December 19, 2011

algebra 1
16
December 15, 2011

algebra 1
Evaluate: 2m^2-(n-p) when m=3, n=-2, p=-4
December 15, 2011

chemistry
Okay this makes sense thank you!
December 12, 2011

chemistry
What mass of barium sulphate can be produced when 100.0 mL of a 0.100 M solution of barium chloride is mixed with 100.0 mL of a 0.100 M solution of iron (III) sulphate? Please explain!
December 12, 2011

present annuity
What is the present value of an annuity that consists of 28 monthly payments of $260 at an interest rate of 8% per year, compounded monthly? (Round your answer to the nearest cent).
December 11, 2011

algebra 1
There are 16 coins in a piggy bank. The coins are all nickels and dimes. All together the total amount of money in the bank is $1.05. How many of each coin are there?
December 7, 2011

Geometry
Line AB (0,0) is perpendicular to line BN (3,4) in the diagram at the right. Angle B is a 90 degree angle. What are the coordinates of point N?
December 7, 2011

3rd grade math
No the answer is 36. Try plugging it into the problem. 36 divided by 2 is 18, which is 6 times 3. Then if you add (the opposite of subtracting) 3 groups of 3 (nine) from 3 multiplied by nine (27) you get 36
December 6, 2011

3rd grade math
Well first 3 x 6= 18 so multiplied by two to get your answer 18x2=36 to check use the second part of the problem: 3x9=27 36-27=9 subtract three groups of three (9) 9-9=0 so we have the correct answer
December 6, 2011

chemistry
Sorry, but how did you find the total volume of the solution?
December 6, 2011

chemistry
Thank you so much, I really appreciate your help!
December 6, 2011

chemistry
Aqueous silver nitrate reacts with aqeous potassium iodide in a double-replacement reaction to produce a precipitate of silver iodide. If 34.6 ml of 0.563 M silver nitrate are used with 148.4 ml of potassium iodide: a) What molarity of potassium iodide will be needed to ...
December 6, 2011

algebra 1
Is it right?
December 6, 2011

algebra 1
i actually wrote the second part wrong. Its supposed to be y=.8x+7.2 not 72. and when i solved it i got 10.4 for y and my x is 4.
December 6, 2011

algebra 1
Solve by substitution. y=.8x+72 20x+32y=48 How do you get y? i got the x part but i can't seem to get the y part.
December 6, 2011

Astronomy-HELP PLEASE!!!!!
Some quasars (quasi-stellar radio source) have the largest red shifts ever observed. If this phenomenon is due to cosmic expansion, what can you say about their distance? What can you say about the age of the quasar at the time the light we now see left the quasar compared to ...
December 5, 2011

ASTRONOMY-HELP PLEASE!!!!!
if count ibis is correct the answer would be 15400 accroding to another person you would get 15, 022.9 which is correct?
December 5, 2011

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