Friday

December 2, 2016
Total # Posts: 1,501

**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*

**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*

**Chemistry**

C2H6 --> 2CH3 at a temperature where the half-life is 21 minutes. If the initial concentration is 8.0 mM, what would the concentration be after 46.0 minutes? How long would it take to convert 95% of C2H6 at this temperature?

*December 2, 2011*

**calculus**

Maximimum profit: you operate a tour service that offers the following rates: (1) $200 per person if 50 people (the minimum number to book the tour) go on the tour. (2) for each additional person, up to the maximum of 80 people total, everyones charge is reduced by $2. it ...

*November 27, 2011*

**algebra 1**

solve by substitution. 0.5x+0.25y=36 y+18=16x

*November 21, 2011*

**Chemistry**

how many moles of lead (II) sulfate will be produced when 500 grams of magnesium sulfate is allowedto react with lead (II) nitrate?

*November 20, 2011*

**government**

why was amendment 17 significant and how were the state governments represented before this amendment?

*November 20, 2011*

**speech**

This might be a hard question to answer but I need an example for my speech for speech class. My speech is a persuasive on why you should foster an animal. I am talking about the benfits and how learning responsibility is a benefit. I know there are organizations out there ...

*November 20, 2011*

**Another Question **

the friday after thanksgiving so this year its the 25th

*November 19, 2011*

**Another Question **

are you talking about 8th grade in school? No school just gives out awards. You can sometimes get awards if you participate in sports such as track, softball, etc.

*November 19, 2011*

**Another Question **

Each grade gets tougher as you go allow. For me 8th grade was not that bad. The grades that you get in 8th grade do not go towards your high school gpa unless you are taking a high school credit course. But, even so, you still want to try your best! If you are in 8th grade or...

*November 19, 2011*

**Question **

I website I like is student questions . com

*November 19, 2011*

**Chemistry**

In an organic chemistry lab, why is the organic layer usually the upper layer in the separatory funnel while the aqueous layer is usually the bottom layer?

*November 16, 2011*

**Chem**

So, for the rate of formation of C, would it be 2.5E-5 x (5/4)?

*November 14, 2011*

**Chem**

Consider the following reaction: 6A + 2B 5C + 4D Determine the following rates at a time when the rate of consumption of B is 2.5E-05 M/s. a) rate of consumption of A M/s b) rate of formation of C M/s c) rate of formation of D M/s d) rate of reaction M/s

*November 14, 2011*

**algebra 1**

write an equation for the line that is perpendicular to the given line and that passes through the given point. (6,4);y=3x-2

*November 14, 2011*

**algebra**

Suppose that Jane borrows 7800 dollars from a bank on April 24 at an annual rate of 7 percent simple interest. How much does she owe on August 14 of the same year?

*November 14, 2011*

**reading**

whay would a leaf be a good rug for a lady bug

*November 10, 2011*

**Chemistry**

In the experiment shown below, you add some salt to water. A = All of the solid dissolves (no solid at the bottom). B = You add more water and the solid stays dissolved. Select all of the following that are true about solutions A and B. The same number of ions are dissolved in...

*November 10, 2011*

**Trig**

Im having serious issues with verifying Trig. identities. Please help! Here is an example: (tanX-secX)^2= 1-sinX/1+sinX

*November 7, 2011*

**calculus**

water in a paper conical filter drips into a cup. let x denote the height of the water in the cup. if 10 in^3 of water are poured into the filter, find the relationship between dy/dt and dx/dt so the paper filter is 4 inches tall whith a radius of 2 inches. x is the height of ...

*November 6, 2011*

**calculus**

a billboard 20ft tall is located on top of a building with its lower edge 60 ft above the level of a viewers eye. how far from a point directly below the sign should a viewer stand to maximize the angle (theta) between the lines of sight of the top and bottom of the billboard...

*November 6, 2011*

**Chem**

The coordination compound has five stereoisomers (geometric plus optical isomers). Select all that apply... A:NH4[Pt(NH3)Cl3] B: tris(ethylenediamine)cobalt(III) sulfate C: tetraaquadichloronickel(IV) chloride D: [Co(NH3)2(en)Cl2]Cl E: [Co(en)2Cl2]Br F: sodium hexacyanoferrate...

*November 4, 2011*

**physics**

a laser beam with wavelength 632.8nm is incident normal to the plane of a diffraction grating with a slit separation d=2000nm. if the diffraction pattern is viewed on a screen 1m from the grating, find the distance separating the first, second, and third maxima in the pattern.

*October 30, 2011*