# Posts by Joe

Total # Posts: 2,609

**physics**

A body is in equilibrum when three forces act on it.Two of the forces are F1 of magnitude 8Newtons acting due east and F2 which is 5Newtons acting 060. find the magnitude and direction of the third force.

**maths**

Two vectors P and Q of magnitudes 5 and 3 units respectively are inclined at an angle of 30 to each other.calculate the component of the resultant in the direction of Q.

**Chemitry**

Consider the neutralization reaction that takes place when hydrochloric acid reacts with aqueous calcium hydroxide Write a conversion factor that relates moles of hydrochloric to moles of calcium hydroxide for this reaction

**Chemistry**

Potassium chlorate, KCIO3, acts as an oxidizing agent in matches, explosives, flares, and fireworks. In the equation below, it is formed from the element chlorine and potassium hydroxide. 3 Cl2+ 6KOH=KCIO3+5KCL+3H2O Write a conversion factor that could be used to convert ...

**Chemistry**

In 1985 benitoite became the California "state gemstone." Found only in a tiny mine near Coalinga, California, it is a silicate of barium and titanium with trace impurities that cause a range of hues from colorless to blue to pink. Its general formula is BaTi(SiO3)3...

**Chemistry**

Normal glucose levels in the blood are from 70 to 110 mg glucose per 100mL of blood. If the level falls to low, there can be brain damage. If a person has a glucose level of 92 mg/ 100mL, what is the total mass of glucose in grams in 5.10 L of blood?

**Math**

Vector u has a magnitude of 5 units, and vector v has a magnitude of 4 units. Which of these values are possible for the magnitude of u + v? There is more than one answer... 1 9 11 13

**math**

My 3-digit number has a 4 in the hundreds place. It has a greater digit in the tens place than the ones place. The sum of the digits is 6. What is my number?

**history**

Thank you Anonymous you got me a 100%.

**brief calc**

Calculate the total area of the region described. Do not count area beneath the x-axis as negative.Bounded by the line y = 6x, the x-axis, and the lines x = 4 and x = 5

**Physics Help!**

.342m/s at 43 degrees to the right

**algebra**

94 * .06 = the first hour times that number by 4

**Algebra**

In a rectangular room 10 feet wide 40 feet long and 50 feet high there are four Windows each 30 inch by 48 inches what is the ratio of Windows Surface 2 floor area in this room?

**physics**

a 1000 kg truck traveling at a speed of 40m/s skids to a halt on wet concrete where µk = 0.60. how long are the skid marks? (Please explain all variables and equations I'm clueless in this subject) I keep trying to use the equation I found online: d= v^2/2ug but I do...

**Chemistry**

When 13.0 grams of acetylene, C2H2, is reacted, what mass of water, H2O, is produced?

**Science**

If a wave has a frequency of 10 Hertz, what does this mean? Thanks.

**Physics**

pressure is force per area in a high wind the increased pressure inside of a skyscraper can be up to 29 lbs/ft2. calculate the wind load in pounds on the windward side of a 150 ft wide, 850 ft tall building. How much is this in newtons?

**Algebra**

A person car uses 5gal. Of gas to travel 132 miles.He has 3 gal. Of gasoline in the car,and he wants to know how much more gasoline he will need to drive 300 miles.

**physics**

South Carolina WR Alshon Jeffery destroys the defense and makes the catch on the Hail Mary pass and dives into the endzone for the TD. (Intermediate Level) Assuming he ran at a constant velocity what is the minimum velocity Alshon would have had to run in order to make it to ...

**social studies**

what was significant about the role of the green mountain boys? select all that apply A}they assisted Washington and his troops in launching a surprise attack in Trenton B}They secured valuable supplies of gunpowder and cannons. C}They secured a key route into Canada D}They ...

**Communications**

I completed my assignment, but I need someone to check the answers, please. This is counting as a test and due tomorrow! Word bank: A. Interactional identity B. positive or solidarity face C. Master identity D. Personal identity E. Romantic self F. Third person G. Modernist ...

**Social Studies**

b and d

**physics**

if someone walks 1.5 km west then 2.5 km 30 degrees south of east then 1.5 km 40 degrees north of east. Starting at the same point, what would be the angle to get someone straight from the starting point to where the other person ended??

**Strategic Management**

1. Ryanair, Wal-Mart, Timex, Casio and Hyundai are all cited as examples of firms pursing cost leadership strategies, but these firms make substantial investments in advertising, which seems more likely to be associated with a product differentiation strategy. Are these firms ...

**math**

Tony invests $3900 in two different accounts. The first account paid 6 %, the second account paid 8 % in interest. At the end of the first year he had earned $280 in interest. How much was in each account?

**Organic Chemistry**

4-sec-butyl-3,5-dimethylheptane. Sources: It was on my homework.

**math**

B) A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4Kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...

**math**

A) Daily sales of petrol from the Nabua service station are normally distributed with Mean6300Landthe standard deviation 400L. (i) If a daily sale is selected at random, find the probability that it is less than 6200L. (ii) If petrol sales are sampled for 40 days, and the ...

**alg 2**

Two trains whose rates differ by six miles per hour start at the same time from stations that are 273 miles apart. They meet in three and a half hours. Find the rate of each train.

**Algebra**

Verify the solution by choosing the correct coordinate point whic states 3x-2y=2 5x-5y=10 Answer choices: (0,-1) (-4,-2) (-2,-4) (1,-5) Thanks for the help

**Social studies**

Is it province

**Social studies**

What is the basic independent unit of the world politics. A county B province C nation D organization****

**Math**

What is the basic independent unit of the world politics. A county B province C nation D organization****

**chemistry**

How many grams of nacl are required to completely neutralize 100 ml of 1M h2so4?

**Math**

When -24 + 7i is converted to the exponential form re^{i \theta}, what is cos(theta)?

**Math**

one person takes up about 2.5 square feet of space. use this value to estimate how many people can fit in an area that is 120 feet wide and 300 feet long.

**Math precalculus**

Let z and w be complex numbers such that |z| = |w| = 1 and zw does not equal -1. Prove that (z + w) / (zw + 1) is a real number. I have tried to rationalize the denominator and I got (z^2*w-z*w^2) / (zw)^2-1 but that got me nowhere. Can someone please help me!!!

**Math**

Never mind I got it

**Math**

Convert ( 4, -pi/6) from polar coordinates to rectangular coordinates. I got sqrt 12, -2 as my answer but it said this was wrong. I checked multiple times and I don't see where I messed up

**Math**

Whoops bad math:) Thanks!

**Math**

It says that -2/3 is wrong

**Math**

The graph of r = 7/ (3 cos(theta) + 2 sin(theta)) is a line. What is the slope of the line? How do you do this!!!

**Maths**

Prove That If the equation x^2+ax+b=0 and cx^2+2ax-3b=0 have a common root then b=5a^2(c-2)/(c+3)^2

**Math**

Please Help A body consists of a solid hemisphere of radius r joined to a right circular cone of base radius r and perpendicular height h. The plane surfaces of the cone and hemisphere coincide and both solids are made of the same material. Show that the centre of gravity of ...

**physics**

A girl sees her image in a shiny glass sphere tree ornament that has a diameter of 18 cm. The image is upright and is located 2.9 cm behind the surface of the ornament. How far from the ornament is the child located? The child is located cm in front of the ornament.

**physics**

A power transmission line is made of copper that is 1.8 cm in diameter. If the resistivity of copper is 1.725 10-8 Ω · m, find the resistance of 7 mi of the line.

**physics**

A copper wire that has a diameter of 2.9 mm carries a current of 39.0 A. Assuming that each copper atom contributes one free electron to the metal, find the drift velocity of the electrons in the wire. The molar mass of copper is 63.5 g/mol and the density of copper is 8.95 g/...

**Physics**

During a thunderstorm, a lightning bolt carries current between a cloud and the ground below. If a lightning bolt transports a total charge of 80 C in 0.001 s, what is the magnitude of the average current? A

**Physics**

A stone is dropped from the root of a building. A person in the building observes that the stone crosses his window that is 2 meters tall in a time of 0.2 second. How far is the roof from the top of the window?

**physics**

A cyclist is on a rolling stationary trainer pedaling such that his wheels are traveling at 30 km/h. He has an unfortunate incident and ends up falling over 90° on his side onto a large patch of ice. Given the cyclist and bicycle have an 4.5 kg*m^2, find the angular ...

**Math**

bob is a genius!!!

**physics**

A dolphin wants to swim directly back to its home bay, which is 0.800 km due west. It can swim at a speed of 3.58 m/s relative to the water, but a uniform water current flows with speed 2.95 m/s in the southeast direction.

**Math**

The heights of Japanese maple trees are normally distributed with a mean of 6 meters and a standard deviation of 0.2 meter. What percent of Japanese maple trees are between 5.5 meters and 6.7 meters tall?

**math**

-9?

**MATH FACTORING**

10x^2+615x+20125 FACTOR PLS

**Pre- algrebra**

2. D 3. B Combine like terms..

**Math**

What's nine minus three divided by a third plus one

**Math**

Same person i know the answer to the first part is 1260. I don't know how many teams will have Alex.

**Math**

In how many ways can a team of 5 players and a coach be chosen from 10 players and 5 coaches? How many of these teams will contain Alex, one of the player?

**Math**

In how many ways can a committee of 12 people, of which 5 must be in the 21−30 age group, 4 must be in the 31−40 age group and 3 must be in the 41−50 age group, be chosen if there are 6 people of each age group?

**Math**

In a card game player get at the start 2 green cards, 3 blue cards, 4 red cards, and 3 yellow cards. In how many ways can the player get cards at the start if this card game has 7 green, 7 blue, 10 red and 10 yellow cards?

**Math**

John has travel 630 miles. The car does 27miles per gallon. The car has a 9 gallon tank. How many times will he have to fill up.

**Bio- HELP?**

herbiovres

**business**

help.

**Exponential Modeling**

Suppose a tortoise is 2000 feet from the ocean. Each day the tortoise travels one-half of the remaining distance to the ocean. Use this information to: Compute the remaining distance to the ocean after 4 days of travel.

**Exponential Modeling**

Atmospheric pressure decreases by about 12% for every kilometer you climb. The pressure at sea level is about 1013 atmospheres. How many atmospheres of pressure will you feel at 8.848 km?

**Exponential Modeling**

A species of frog’s population grows 24% every year. Suppose 100 frogs are released into a pond. How many frogs will there be in 5 years?

**math**

The Davidson family wants to expand its rectangular patio, which currently measures 15 ft by 12 ft. They want to extend the length and width the same amount to increase the total area of the patio by 160 ft2. Which quadratic equation best models the situation? A = lw (15)(12...

**World History**

Can somebody check over my answers my answers are : B;C;B;A;D;C;A;B;D;C;A;B;B;B;C;D;A;A;B;C;… C;D;1. Trench warfare caused the immobilization of troops on the (1 point)Western Front.Middle Eastern desert.Eastern Front.mountains in Russia.2. After the war, Britain ruled ...

**Social Studies**

Actually I like C

**Social Studies**

The Northwest Ordinance established all of the following, except rules for territories to become states. denying slavery to new states formed from the territory. preventing new states from entering the United States. the right to education (------my choice

**Physics**

A geostationary satellite orbits the Earth in such a manner that it is always directly above the same point on the equator as the Earth rotates. Assuming that this orbit is circular, what is its radius? (The mass of the Earth is approximately 5.97 × 1024 kg and the ...

**chemistry**

how many protons and electrons are in 7.4 grams of hydrogen?

**Statistics**

If a normally distributed group of test scores have a mean of 76 and a standard deviation of 10. Find the probability that student will earn a grade between 65 and 85

**Math**

Let $f(x) = \dfrac{2-3x}{5-2x}$. For what value of $a$ is $f(a) = 3$? Thanks!

**Math**

Let f(x) = 2-3x/5-2x. For what value of a is f(a) = 3?

**Math**

210 litres divided by 2 then divided by 2.5l per minute =42

**Math**

Given the points (A) 0,0 (B) 4,3 (C) 2,9 what is the measure of angle ABC

**Math**

If a square is 8.4 feet on each side. How many square feet is it

**Chemistry**

In a 1.0× 10–2 M solution of CH3NH3Br(aq), identify the relative molar amounts of these species. H2O, OH-, CH3NH3+, CH3NH2, H3O+, Br-, HBr

**reading comprehension**

C. JIM IS PENNYS GRANDFATHER

**Physics**

A 40.0 ohm resistor, 20.0 ohm resistor, and a 10.0 ohm resistor are connected in series across a 220-V supply. Which resistor is the warmest? a. 40.0 ohm b. 20.0 ohm c. 10.0 ohm d. they are all the same

**Health**

Donut you lied i got a 47 i am ging to cry you got it wrong i should of stick with my ansers your no help:(

**Math**

An object is launched at 9.8 meters per second from a 73.5-meter tall platform. The object's height s (in meters) after t seconds is given by the equation s(t)= -4.9t(-4.9t) - 9.8t = 73.5. When does the object strike the ground? I can't figure out how to factor it ...

**Math**

A woman bought some 13 cent stamps and some 8 cent stamps at the posg office. She spent exactly 1 dollar. How many of each stamp could she have bought?

**Math**

If sales tax in a specific county is 6.5%, what is the total price paid on a purchase of $156.00.

**CHEMISTRY HELP**

assume that 13.5g of AL react with excess HCl according to the following balanced equation, at STP: 2Al(s) + 6HCl(aq) ---> 2AlCl3 + 3H2(g) how mang liters of H2 at STP are produced?

**Physics**

Thank you!

**Physics**

A circuit consists of a 10 ohm resistor in series with 3 identical batteries each with an emf = 1.0V and internal resistance of 5 ohms. a) find potential difference between the terminals b) potential difference across the 10 ohm resistor c) power dissipated in resistor

**Science**

Calculate the amount of heat required to completely convert 1kg of water at 0°C to the boiling point at 100°C?

**algebra or algebra1**

500.04

**algebra**

A hotel swimming pool measures 25 m by 9m. The hotel manager wants to put a 3m wide deck around the pool. Calculate the area of the deck

**Calculus**

Find the length of the entire perimeter of the region inside r=5sin(theta) but outside r=1. 1=5sin(theta) theta=arcsin(1/5) r'=5cos(theta) I tried the integral between arcsin(1/5) and pi-arcsin(1/5) of (((5sin(theta))^2+(5cos(theta))^2))^1/2 which gives me 13.694 Webworks...

**Algebra: Check Answer**

Okay, Thanks!

**Algebra: Check Answer**

one more: 3x^2 - 147 = 0 a) -47, 49 b) -7, 7 ~~MY ANSWER~~ c) -square root 7 , square root 7

**Algebra: Check Answer**

x^2 - 81 = 0 a) -square root 9 , square root 9 b) -81 , 81 c) -9 , 9 ~~ MY ANSWER ~~ d) no real solutions

**Trig.**

If TanTheta= -65/72 and the terminal side of theta lies in Quadrant II use a pythagorean identity to find sec theta.

**Physics**

A bullet of mass 3.9 g was fired at a stationary ball of lead. The head on impact moved the 10 kg ball at a velocity of .3703 m/s. If energy losses due to heat and internal energy are ignored. What was the speed of the bullet? a)370 b)950 c)549 d)975

**Physics**

A bullet of mass 3.9 g was fired at a stationary ball of lead. The head on impact moved the 10 kg ball at a velocity of .3703 m/s. If energy losses due to heat and internal energy are ignored. What was the speed of the bullet?