# Posts by Rachel

Total # Posts: 1,537

**science**

Three very small spheres of mass 3.00 kg, 5.00 kg, and 3.00 kg are located on a straight line in space away from everything else. The first one is at a point between the other two, 13.0 cm to the right of the second and 24.0 cm to the left of the third. Compute the net ...

**help please :)**

its not b either

**math**

find the area between the curve y= 1 divided by (1=3x)^2

**calculus**

the area under the curve y= square root of 9-x^2 with coordinates x=-3 and 3 , find the volume rotated aroudn the x-axis

**Physics**

A 25 N book sits on a table. What is the magnitude of the normal force the table exerts on the book?

**chemistry**

If you use 1 gram of salacylic acid and 3ml of acetic anhydride & 3 drops of phosphoric acid and 1 ml of water after boiling = 0.55 g of aspirin. What is the % yield?

**Geometry**

The equation (x + 6)^2 + (y + 4)^2 = 36 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals.

**physics ...plzzzz help...**

ya i m sorry ...i wrote the wrong expression by mistake

**physics ...plzzzz help...**

thank you ...so much..

**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 ...

**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

**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 ...

**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 ...

**Geometry**

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

**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 ...

**trig**

62.83 radians/sec

**Geometry**

fallen*

**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?

**Algebra 2**

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

**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

**beginning spanish**

yes or yo se historia

**algebra**

7% of 64

**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

**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 ...

**SOCIAL STUDIES PLZZ HELP**

1. Brasilia 2. the indigenous way of life. 3. Salvador Just got 100% :)

**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. ...

**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 ...

**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}.

**physics**

1.3 m/s^2 upward

**biology**

C

**Converting Polar Equations to Cartesian Equations**

r2 = 6rcos(θ) + 7rsin(θ)

**Statistics**

What does mu represent for this problem?

**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...

**physics**

Square Root

**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

**Chemistry**

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

**English 11**

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

**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?

**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?

**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 ...

**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.

**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?

**math**

what is the prime factorization of 63?

**Medical billing and coding**

Thank you that helps a lot.

**Medical billing and coding**

compare and contrast contributory negligence with comparative negligence.

**physics**

thanks

**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...

**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 ...

**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 ...

**physics**

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

**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

**Math**

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

**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

**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?

**Math**

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

**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

**chemistry**

How much HCL would be needed to neutralize 250mL of 6 M NaOH (HCL = 1.5 M)?

**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?

**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?

**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?

**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?

**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.

**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.

**Geometry**

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

**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.

**chemistry**

how do i find polyatomic ions?

**Chemistry**

Why do metals tend to be malleable?

**history**

That answer is not correct.

**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...

**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?

**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.

**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?

**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...

**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?

**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...

**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...

**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?

**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?

**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)

**math**

27,907,200

**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!!!!!

**Algebra 1**

Find the greatest common factor of 12x^2+18x-36

**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

**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).

**algebra**

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

**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?

**math**

f:(x)= x^2+5 find f(0)

**trig**

evaluate sin (11pi/6) to the nearest thousandth.

**math**

a+4(6a+2b^2)+(a^2-6b^2)

**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?

**Physics**

is it possible to solve without the initial temperature of the copper?

**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...

**Chemistry**

5 - got it

**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. ...

**algebra 1**

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

**Science**

pressure=100N/20M/S

**algebra 1**

16

**algebra 1**

Evaluate: 2m^2-(n-p) when m=3, n=-2, p=-4

**chemistry**

Okay this makes sense thank you!

**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!