# Posts by Rachel

Total # Posts: 1,527

**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*

**trig**

62.83 radians/sec

*May 16, 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*

**algebra**

7% of 64

*May 6, 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 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*

**Converting Polar Equations to Cartesian Equations**

r2 = 6rcos(θ) + 7rsin(θ)

*March 20, 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**

D D B A D B Got 6/6 These are right for CA students.

*March 14, 2012*

**english 11**

so are any of these right????

*March 14, 2012*

**Math**

A mechanic charges $35 an hour plus parts to ±x a car. If the parts cost $90 and it took 5 hours to do the job, what is the total cost of the repair

*March 13, 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*

**English 11**

THESE ARE CORRECT FOR CA D,A,A,C!

*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) COM = (maxa + mbxb)/(ma + mb)

*February 27, 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*

**math**

27,907,200

*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*