# Posts by angel

Total # Posts: 1,203

**Physics**

A charge +q is at the origin. A charge -2q is at x = 6.30 m on the +x axis. (a) For what finite value of x is the electric field zero? (b)or what finite values of x is the electric potential zero? (Note: Assume a reference level of potential V = 0 at r = ?.) Smallest value of ...

**Math**

Why did they remove my question about youtube? That's what i'm learning in school

**Geometry**

We can help if you post the ones you need help with

**Probability **

In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. A) what is the probability that the student majors in business ...

**Math**

unpaired

**Math 6A**

1. 6*0.05 = ? 2. CORRECT!

**Question!! **

I don't quite understand why we had to do 1.5/.054 ? Like what is the reasoning behind it? Why didn't we just do F=(q1q2)/r^2 where r would now be 0.054? and if we can't do this why is it wrong to do this? Really appreciate the help!

**Physics**

A +33.0 nC charge is placed at the origin of an xy-coordinate system, and a ?25.0 nC charge is placed at the point (1.500 m, ?0.0540 m). (a) Determine the magnitude and the direction of the force that the positive charge exerts on the negative charge. Use ijk notation for your...

**Math**

220 -(35*4) = ?

**math**

numbers of ways a person can travel from a to c via b, if there are 3 routes from a to b and 5 routes from b to c

**Statistics **

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

**Statistics **

A committe of 5 members will be chosen from a group of 10 teachers and 5 students. What is the probability that the committee will have A) all teachers? B) 3 teachers and 2 students? C) 3 or 4 teachers?

**math**

The square root of the product of 4 and a number is 26

**Calculus**

Thanks Steve for your explanation. The questions never gave how deep the water is, which was why I was a bit thrown off.

**Calculus **

water drips into an upside down cone, whose diameter at the base is 10 cm , and whose height is 15 cm. If the water is dripping int a rate of 2cm^3 per minute, how fast is the height rising.

**Math please help !!!!!!**

How many blocks 1 inch on each edge would it take to fill a shoe box that is 12 inches long , 6inches wide , and 5 inches high ?

**Physical Science A**

hallium-206 decays by beta emission to make the next element to the right in the periodic table (lead-206)

**linear algebra**

Find the scalar equation for the plane passing through the point P=(0, 2, ?1) and containing the line L defined by x = 2+t y = 4+t z = ?6+7t

**linear algebra**

Let L1 be the line passing through the point P1=(9, 0, 0) with direction vector ?d1=[3, 2, ?2]T, and let L2 be the line passing through the point P2=(?10, 8, 4) with direction vector ?d2=[3, 0, 2]T. Find the shortest distance d between these two lines, and find a point Q1 on ...

**Algebra**

1.What is the slope of the line that passes through the pair of points (3,8) and (9,5)? Options -2 2 1/2 -1/2 2.Write an equation in point-slope form for the line Through the given point with the given slope. (8,3);m=5 Options Y+3=5(x-8) Y+3=5x-8 Y-3=5(x-8) Y-3=5(x+5) I think ...

**math**

23

**Linear Algebra**

Let L be the line with parametric equations x = 2+3t y = 3?2t z = 2+t Find the shortest distance d from the point P0=(?5, 1, ?4) to L, and the point Q on L that is closest to P0. Use the square root symbol '?' where needed to give an exact value for your answer. d = _ ...

**Physics**

Are you saying that I was doing it right, then? I did (4*10^5)V/303 = 3*10^5(0.45*10^-4)/313 1320.13V = 0.043 V = 0.00003267177507 m^3

**Physics**

A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^?4 m^3. Estimate the original volume of the gas. I ...

**Physics**

Thank you! I realized my problem was that I didn't convert g/cm^3 to g/m^3 correctly

**Physics**

The density of copper is 8.96 g cm^?3 and its molar mass is 64 g mol^?1. The mass of an atom of copper is 1.1*10^-22 g Determine the number of copper atoms per cubic metre.

**Math**

Pradip and pam each have apple slices and orange slices. The ratio of apple slices to the total number of slices is 4 to 11. The ratio of the total number of slices to orange slices on Pam's plate is 13:6. Neither person has more than 20 total slices. Who has more slices? ...

**Science**

force of gravity proportional to distance squared so...

**Linear Algebra**

Given the following matrices A and B, find an invertible matrix U such that UA = B: A and B are 4x4 matrix and i have to find U. I was wondering how i would do this ie. the steps. if you could be as detailed as possible that would help me. I wanted to try and do it myself ...

**Physics**

A train slows down as it rounds a sharp horizontal turn, going from 86.0 km/h to 44.0 km/h in the 13.0 s that it takes to round the bend. The radius of the curve is 140 m. Compute the acceleration at the moment the train speed reaches 44.0 km/h. Assume the train continues to ...

**Linear Algebra**

Given the following vector X, find a non-zero square matrix A such that AX=0: X=[2 -5 3]^T Im not sure how i would find the sqare matrix a?

**Language**

Metufor

**Calculus **

Use the given graph of f to find a number ? such that if 0 < |x ? 3| < ? then |f(x) ? 2| < 0.5. since i cannot put up the graph ill put the coordinates (2.6,1.5) (3,2) (3.8,2.5) Please help im not sure how to solve this

**Physics/Math**

Prove cos^2 ? + cos?^2 ? + cos^2 ? = 1 . Thank You

**Physics**

I m doing an assignment and this is what is asks: (c) Find the sum of the squares of the cosines of the corresponding coordinate direction angles found above. (Measure the cosines of the corresponding coordinate direction angles from the x-y plane.) Im not quite sure what it ...

**chemistry**

Well Mg is in the second column on the periodic table mean it would have a +2 charge.

**History **

How did John Calhoun react to the Tariff of 1828? A. He used his power as Vice President to influence President Jackson to oppose the tariff. B. He led a charge to impose sticker regulations on the second bank of the United States. C. He devised a force bill allowing the ...

**science**

A coach tells his little league players that hitting a 0.275 batting average, within 7% percentage error, means that they had a really great season. Seven year old Tommy ended the season hitting a 0.258 batting average. According to his coach, did he have a great season?

**Math**

A rectangular garden plot 16 by 24 meters is to be bordered by a strip of uniform width x meter so as to double the area. Find x.

**Math**

*supposed I mean

**Math**

I dont know either. The problem was given by our teacher. And yes, it is supposes to be y subscript p. Thank you.

**HVAC**

Two HVAC/R technicians are discussing the tape used in HVAC/R repairs. Technician A says that cloth duct tape is preferred for use in attics. Technician B says that UL 181 tape is normally required for duct closing systems. Which one of the following statements is correct?

**Math**

Thanks! Neede that

**Math**

Simpilfy the radical expression by rationalzing the denoiminator? 3/sqrt15 a)sqrt45/15 b)sqrt15/5 c)5sqrt15*** d)sqrt3

**Math**

So am I right or wrong I suck at this

**Math**

My secon guess was C

**Math**

What are the solutions of the system? y=x^2+3x-4 y=2x+2 a) (-3,6) and (2,-4)** b) (-3,-4) and (2,6) c) (-3,-4) and (-2,-2) d) no solutions

**Science (soon if so) **

Thank's Student12!

**Science (soon if so)**

Over the years technology has gotten a) smaller**** b) heavier c) less complicated d) more expensive What is nanotechnology? a) Nanotechnology is engineering new elements by changing their atoms***** b)Nanotechnology is a way to lengthen radio waves and improve cell phone ...

**Pre- Algebra**

If you were to roll a fair number cube 120 times, how many times would you expect to roll a 4 based on theoretical probability

**geography**

Explain the effects of the poor service delivery. There must evidence that i actually investigate the poor service delivery physically where possible. Explanation must be with regard to social or Economic or Environmental problem

**Microbes and society **

In Chapter 9 of the Bible, in the book of Exodus, the sixth plague of Egypt is described in this way: “Then the Lord said to Moses and Aaron, ‘Take double handful soot from a furnace, and in the presence of Pharaoh, let Moses scatter it toward the sky. It will then ...

**Algebra **

Check my answer- Solve the system of equations algebraically. Show all of your steps. Y=x^2+2x Y=3x+20 My answer: X^2+2x+3x+20 X^2-x-20 (x-5),(x+4)=0 x=5, x=-4 y=35, y=8 Thank you!

**Maths**

the angles of of evolution of the top of a hill from the City centres of two towns on either side of the hill are observed to be 30Â° and 60Â° respectively. if the distance of hill of the top from the city centre of first is 9 kilometre find in kilometres ...

**Physics**

A 5g bullet is fired horizontally and hits an 8kg block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

**Physics**

A 5 gram bullet is fired horizontally and hits an 8 kilogram block of wood (initially at rest) which can move freely. The wood and the bullet move with a velocity of 0.50 m/s after impact. What is the initial velocity of the bullet?

**Math**

The pitch of a screw is the distance between its threads. With each complete rotation, the screw goes in or out a distance equal to its pitch. If the pitch of a screw is 1/17 inch, how far will it go into a piece of oak when it is turned 14 complete rotations clockwise?

**Math**

If a recipe calls for 4 eggs for 8 people how many eggs would it be for 32 people

**Math**

270

**4th grade math**

??????¿¿¿¿¿¿±±±±±

**Calculus-derivatives**

At what points on the graph of f(x)=6x^2+4x-9 is the slope of the tangent line -2?

**Chemistry **

1.38 mol HCl and 2.9 mol NaOH react accord- ing to the equation HCl + NaOH ?? NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol.

**Chemistry **

1.38 mol HCl and 2.9 mol NaOH react accord- ing to the equation HCl + NaOH ?? NaCl + H2O . If the limiting reactant is HCl, determine the amount of excess reactant that remains. Answer in units of mol.

**Math**

My numerator is 2 less than my denominator I am more than 1/2 what fraction can i be?

**calculus**

define f(x)={x+a if x>2 {-1 if x=2 {ax+b if x<2. How to determine the values of a and b for which f(x) is continuous in the set of real numbers.

**math geometry**

Find the area of the triangle defined by the coordinates (-3, -4), (-7, 0), and (-3, 4).

**science **

Numerical problem : The dimensions of a certain water tank are 8m x 6m x 4m. What is the pressure at the bottom of the tank, if the tank is half filled?

**Math**

If the coefficient of sliding friction for steel on ice is 0.05, what force is required to keep a man weighing 150 lbs moving at constant speed along ice?

**Dynamics**

A level fight bomber flying at 300 ft/s releases a bomb at an elevation of 6400 ft. Approximately how long before the bomb strikes the earth?

**Dynamics of rigid bodies**

a stone is thrown upward with a velocity of 40m/s.Determine the time of the stone when it is at a height of 10m and is moving downwards.

**Chemistry AP**

How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate?

**Science**

A lead calorimeter with mass of 150g contains 200g of water. The calorimeter and water are in thermal equilibrium at a specific temperature. Two metallic blocks are placed into the water. One is a 50.0g piece of aluminum heated at 90 degrees celcius. The other has a mass of ...

**math**

Put the following decimals and fractions in order from greastest to least: 0.15, 2/3, 3/5, 0.25, 1 1/8

**Analytical chemistry**

Calculate the expected concentrations of vitamin B6 and caffeine in the stock solution assuming exactly 0.0506 g of pyridoxine hydrochloride (vitamin B6) and 0.1253 g of caffeine are dissolved in a 100 mL volumetric flask.

**English**

One of the individuals in the selection I chose is Laetitia. She moved away from home to be with her boyfriend. Moving to anew place can make you feel sad and sometimes angry. But Laetitia is with the one she loves and that made up for feeling different in a different place.

**Mathematics**

This wasn't there before Sorry But I have a test and I urgently need help

**Mathematics**

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. plzzzzzzzzzzzzz helppppppppp on thisssss. On my previous question I even showed my work

**Math**

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. Since no one looked at my previous work.................

**Math**

Okay That's makes so much sense. Thank you so much

**Math**

The area of one of the faces of the cube below is x^2+2x+1 cm^2. Find an expression in mixed radical form for the length of the interior design. My Work: Step 1: a^2 + b^2 = c^2 =(x-1)(x-1) x-1 equals to all the sides of the cube Step 2: a^2 + b^2 = c^2 (x-1)^2 + (x-1)^2 = c^2...

**French!**

1-Les images animes(accute accent on the last "e") sont crees(accute accent on all the "e") par les freres Lumieres. 2-Le portrait peint est remplace(accute accent on the last "e") par laphotographie. 3-Les premieres vues aeriennes sont realisees(...

**French**

1- ... sont comuniques(Accute Accent on the last "e") 3-...sont soumises 5-...est lancee(A.A on the second to last "e") 7-...sont perdues 8-...sont seduits

**Business Law**

Can anyone please help? Covenants not to compete (noncompete agreements) are generally legal in most states as a matter of employment contract law as long as: Choose All that APPLY: a. they are not excessive in the amount of time they run b. the hired employee has insisted on ...

**Geometry**

In Parallelogram PARK, angle P = (7x) degree angle A = (3x - 20) degree angle K = (5y - 10) degree. What is x + y?

**math**

Show me how to make $0.60 in two ways,without using quarters or pennies

**Analytical chemistry**

Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

**MATH**

A dietician is planning a snack package of fruit and nuts. Each ounce of fruit will supply zero units of protein, 3 units of carbohydrates, and 2 unitss of fat, and will contain 20 calories. Each ounce of nuts will supply 2 units of protein, 11 ...

**6th grade math**

If someone can please help me i keep re reading my mathbook I need help i tried I'm unsure: Is there a relationship between area and perimeter? (My answer : yes they both are meadurements one reads the outside and one inside.) Does changing one mean the other one always ...

**algebra**

write an explicit formula for the nth term an for 17,20,23,26

**Math**

Find the quotientshapes to the nearest hundreth. 5.8 divided by 30.8 Is this correct so I round 5.8 to 6 and 30.8 to 31 ?

**6 grade math**

Find the area of the figure at right in at least two different ways. Explain how you get your answer with diagrams and remember to label them with the correct units. So the image is a 10cm by 15cm and smaller box attach to the side. Like an London shape . I think I should just...

**Algebra**

Find all points on the line x = 3 that are 8 units from the point (10,-10).

**Statistics**

Can anyone help me with this? Which of the following statements is true about a 99% confidence interval? a. The interval contains 99% of the population. b. The probability that the population mean is in the interval is 99%. c. The interval is wider than a 95% confidence ...

**English**

When summarizing the of a plot, one should notice the key ideas about how the conflict builds.

**English**

Which are features of myths? Check all that apply. supernatural gods or animals fantastic settings humorous elements that entertain the reader an attempt to explain the origin of the universe characters found in everyday life conflicts between worlds, beings, self, or natural ...

**Math graphs,dot,ven**

I did a bar graph I think it is easier than dot and ven diagram. Am I correct because ven diagram there are no similarities and dot is to long.the problem asks as follows. Display the data using a dot plot,bar graph or vennot diagram.decide which data displays best for ...

**Trigonometry**

find an equation of the line passing throug (2,6) and is inclined at an angle 60 degrees counterclockwise from the horizontal

**History**

Thanks guys this helped so much!

**analytical chemistry**

Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.

**analytical chemistry**

Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.