Saturday

December 20, 2014

December 20, 2014

Number of results: 21,286

**Physics please help!!**

A 86.0 kg diver falls from rest into a swimming pool from a height of 6.30 m. It takes 1.86 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.
*February 11, 2011 by Megan*

**Chemistry**

In the manufacturing of computer chips, cylinders of silicon are cut into thin wafers that are 2.80 inches in diameter and have a mass of 2.00g of silicon. How thick (mm) is each wafer if silicon has a density of 2.33g/cm^3? (The volume of a cylinder is V=(pi)r^{2}h.)
*September 5, 2011 by Jennifer*

**Physics**

A 86.0 kg diver falls from rest into a swimming pool from a height of 6.3 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.
*December 6, 2011 by Bob*

**physics**

A 95.9-kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is ìk = 0.554. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.63 s, what is his initial speed?
*July 8, 2013 by tcc*

**economics**

Calculate the mid-point elasticity of demand. Please review chapter 6 before taking this assignment. Question: The online bookseller wants to increase its total revenue by offering 10% discount on every book it sells.Its custmers are divided in 2 groups Group A and group B ...
*February 12, 2010 by april *

**economics**

Calculate the mid-point elasticity of demand. Please review chapter 6 before taking this assignment. Question: The online bookseller wants to increase its total revenue by offering 10% discount on every book it sells.Its custmers are divided in 2 groups Group A and group B ...
*February 12, 2010 by april *

**physics**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...
*September 6, 2010 by Jack*

**chemistry**

A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g. What is the density of concentrated sulfuric acid? (Assume water has a density of 1.00 g/cm3 at the ...
*September 6, 2010 by Jack*

**psy**

I think that possibly Donnie will have a bigger risk of being persuaded into peer pressures. In what I have seen it seems the more quiet individuals will give into peer pressure more easily then ones that are outgoing and outspoken. The majority of the time you will see the ...
*April 26, 2009 by shantel*

**psy**

I think that possibly Donnie will have a bigger risk of being persuaded into peer pressures. In what I have seen it seems the more quiet individuals will give into peer pressure more easily then ones that are outgoing and outspoken. The majority of the time you will see the ...
*April 26, 2009 by shantel*

**psy**

I think that possibly Donnie will have a bigger risk of being persuaded into peer pressures. In what I have seen it seems the more quiet individuals will give into peer pressure more easily then ones that are outgoing and outspoken. The majority of the time you will see the ...
*April 26, 2009 by shantel*

**Physics**

A ball is shot from the ground into the air. At a height of 0.1m, the velocity is observed to be v=7.7i + 6.4j in meters per second (i horizontal, j upward). What is the direction of the ball's velociry just before it hits the ground?
*September 30, 2007 by Kristen*

**Business law**

I am trying to understand what it means to be "incompetent" in Law. How is one judged as such?You can't tell by just looking at someone if wheteher they are incompetent or not to enter into a contract? I am really confused.
*February 25, 2008 by Mike*

**physics sound**

1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
*April 17, 2008 by Chris Adison*

**AED**

What are the fundamental differences between Western philosophies and Eastern ways of knowing? How does each culture generally view the world and education? How can you incorporate seemingly different ways of knowing into your curriculum?
*August 3, 2008 by Carol*

**Pre-Calculus**

I am in Honors Pre-Calculus and am having a hard time understanding my teacher. I feel so stupid. Does anyone have any suggestions on a website that might give me some insight into what I am doing wrong? Thanks!
*October 7, 2008 by Jill*

**english**

Can someone explain thoroughly what EFL learners get from the task where they have ti put new words into context?Can someone explain this stategy?And also another strategie - using linguistic clues
*December 21, 2008 by lily*

**history**

computers came into widespread use in the 1950s mainly because they became a. safer and easier to clean b. slower and easier to use c. smaller and faster d. larger and more powerful i dont know?
*April 19, 2009 by history*

**Research Writing Com 220**

Were going into week 7 I don not know how to do a rough draft of research paper but I'm going to write about Domestic Violence and Homelessness I'm nedding to see sample of how to do this. I need help Thanks
*May 18, 2009 by Canda*

**9th. algebra**

how can I figure out the formula. example. I need to transform the following equation y = x2 + 4 - 8 into vertex form and then I need to state the coordinates of the vertex of the parabola. I forgot how to arrive at the answer
*May 29, 2009 by sc*

**Maths**

I have already asked this question but I have to use my calculator to solve x^2 + 8x + 5 = 0 Someone gave me a link to a quadratic formula solver but when I enter it into my calculator I nvever get the right answer.
*September 17, 2009 by Remy*

**Chemistry II**

Calculate the enthalpy change in kilojoules when 54.7g of MgCO3 decomposes according to the following equation: MgCO3 (s) into MgO (s) + CO2 (g) My delta H answer was 100.6 KJ but the real answer is 76.1 KJ. Can someone please help?
*November 29, 2009 by Mandy*

**crt-205**

We gradually came to realize that equal protection really had to say that we can't discriminate in school attendance, and then beyond school attendance into many other fields. Is this a rhetorical device?
*March 12, 2010 by sam*

**dynamics of catering**

john is a caterer who encourages his staff to make suggestion on work procedures and frequently incorporates their thoughts into his management program. what kind of management style does john exhibit?
*March 13, 2010 by mona*

**PHYSICS**

A ball of mass m at rest at the coordinate origin exploded into three equal pieces. At a certain instant, one piece is on the x-axis at x=40cm, and another is at x=20cm, y= -60 cm. Where is the third piece at that instant.
*April 8, 2010 by Student*

**physics**

A jet airliner moving at 500 mph due east moves into a region where the wind is blowing at 120 mph in a direction north . What is the new velocity and direction of the aircraft?
*June 10, 2010 by brandon*

**Mathematics: Pre-cal**

Consider a rectangular bathtub whose base is 12 ft^2. At what rate is water pouring into the tub if the water level rises at a rate of 0.9 ft/min? Please show steps. (I want to know how)
*June 29, 2010 by Rebecca*

**physics**

the mathematical relationship between velocity (v) and time (t) for a coin tossed up into the air after it leaves the thrower¡¦s hand at t = 0 with a velocity of +15.0 m/s. Assume that the positive direction is upward and the acceleration of the coin is ƒ{9.8 m/s2.
*October 15, 2010 by abe *

**AP physics**

A 66 kg diver steps off a 13 m tower and drops, from rest, straight down into the water. If he comes to rest 4.4 m beneath the surface, determine the average resistance force exerted on him by the water.
*November 10, 2010 by kaitlyn*

**physics help**

A 8.6 kg board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 186 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.
*November 15, 2010 by jason*

**Physics**

1)A car misses a turn and sinks into a shallow lake to a depth of 11.4 m. If the area of the car door is 0.56 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101 kPa.
*November 22, 2010 by Jamine*

**geometry**

a cone is designed to fit perfectly into a cylinderical container given the volume of the cone is 100 cm3 and the curved surface area of the cylinder is 150 cm2, what is the height of the container?
*December 14, 2010 by james j*

**math**

forty-nine days is how many weeks? what are the factors of 12? forty books were put into eight equal stacks how many books were in each stck? how many years are in five centuries? what is the seventh mutiple of 6 then subtract 12 what is the differcecne?
*December 15, 2010 by jojo*

**Pre-calc**

Find the effective rate of interest for 5.25% compounded quarterly. I don't know how to solve this. Would I use this equation A=Pe^(rt) But still I don't know because even if I put the given info into the equation I still need P and A
*January 12, 2011 by Amy*

**physics**

A 84 kg diver steps off a 10 m tower and drops from rest straight down into the water. If he comes to rest 4.7 m beneath the surface, determine the average resistance force exerted on him by the water.
*February 26, 2011 by floyd*

**Math**

A car tire has a diameter of 3 feet and is revolving at a rate of 45 rpm. At t = 0, a certain point is at height 0. What is the height of the point above the ground after 45 seconds? Can you lead me into the right direction?
*August 10, 2011 by Dara*

**Personal Finance**

◦What is Social Security? Discuss how it fits into your retirement plan. There are concerns that Social Security may have trouble paying full benefits in the future. Why does this matter to you now?
*September 1, 2011 by Her*

**Computer Science**

Use the Infix to Prefix algorithm shown in class to translate the following arithmetic expressions into the fully parenthesized "prefix notation" of Scheme expressions. (11 - (((27 / 18) / 131) + 927)) v + w - x + y - z v + w - (x + y - z)
*September 7, 2011 by erika*

**uphysics**

Some planetary scientists have suggested that the planet Mars has an electric field somewhat similar to that of the earth, producing a net electric flux of 3.57×1016 into the planet's surface.
*September 7, 2011 by Anonymous*

**chemistry**

A foundry releases 6.0 tons of gas into the atmosphere every day. The gas mixture contains 2.5% sulfur dioxide (SO2) by wieght. How many pounds of SO2 are released in one week?
*September 30, 2011 by Joe*

**chemistry**

A diesel engine's piston compresses 16 cm3 of fuel-air mixture into 1 cm3. The pressure changes from 1 atmosphere to 48 atmospheres. If the initial temperature of the gas was 305 K, what was the final temperature?
*November 2, 2011 by Nikoli*

**Physics**

A copper calorimetric cup with a mass of 100g contains 96g of water at 13 C. If 70g of a substance at 84 C is dropped into the cup, the temperature increases to 20 C. Find the specific heat capacity of the substance
*December 8, 2011 by Dorrito*

**physics**

In a head-on collision, a car stops in 0.11 s from a speed of 23 m/s. The driver has a mass of 87 kg , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
*January 13, 2012 by Malik*

**Chemistry**

When sodium Metal is dropped into water, all the metal reacts in the equation shown below. What mass of hydrogen is liberated from a 46.0 gram piece of sodium? 2Na(s)+2H2O(I) > 2NaOH(aq)+H2(g)
*January 13, 2012 by Franklin*

**Chemistry**

A sample of steam with a mass of .550 g and at a temperature of 1 degrees C condenses into an insulated container holding 4.40 g of water at 5.0 degrees C. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?
*January 24, 2012 by Becca*

**College Physics**

A 1.00 g lead bullet at 28.0°C is fired at a speed of 230 m/s into a large block of ice at 0°C, in which it becomes embedded. What quantity of ice melts? Can someone walk me through this step by step?
*January 30, 2012 by Anand*

**macroeconmoics**

Your parents put $500 into an account paying 7 percent interest for you when you were ten. Ten years later they tell you that you can take the money out of the account. What is the balance to the nearest penny?
*February 4, 2012 by Anonymous*

**english immigration**

I need help explaining experiences english immigrants had while travelling to the united states in the 1920s. Also, how they gained entrance into the counrty and experiences at Ellis Island
*March 7, 2012 by Anonymous*

**math**

Paul's dresser has 10 loose socks that can make 5 different pairs. If Paul reaches into the drawer and randomly picks 2, socks what is the probability that they match? A1/2 B1/5 C1/10 D1/45 P.s Please explain how u worked it out :) thanks:p
*April 15, 2012 by sk8r Grl *

**Physics**

In a head-on collision, a car stops in 0.14{\rm s} from a speed of 24{\rm m}/{\rm s} . The driver has a mass of 67{\rm kg} , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
*October 5, 2012 by Amanda*

**PHYSICS**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 10.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision?
*October 31, 2012 by KIEN*

**Physics**

Dry ice is frozen carbon dioxide. If you have 1.4kg of dry ice, what volume will it occupy if you heat it enough to turn it into a gas at a temperature of 20 degrees Celsius? (answer is in m^3)
*December 4, 2012 by Anonymous*

**chemistry**

Carbonic acid, H2CO3, decomposes into water and a gas. Write the molecular equation for this decomposition. Remember to include the states of the reactants and products. Carbonic acid is an aqueous solution.
*January 9, 2013 by thad*

**maths**

Rudransh has a piece of cardboard in shape of a quadrilateral. He cuts it into two triangles such that angles formed at the vertices are bisected. He wants to find out whether the two triangles are congruent or not
*January 10, 2013 by Anonymous*

**maths-triangles**

how can we obtain the areas of the irregular polygans or irregular shapes or just any closed curve...?? if we know the perimeter of that shape than do v need to divide it into any kind of simpler shape like triangle
*March 5, 2013 by anoynomous*

**Math- Partial Fractions**

Decompose the following into partial fractions after factoring the denominator as much as possible. Please show some work so I can understand how you did it. 1)x^2/((x-1)(x^2+5x+4)) 2)(3x^3-5x^2+12x+4)/(x^4-16) 3)1/(x^2 (x+1)^2 ) 4)(x+1)/((x^2+1) 〖(x-1)〗^2
*April 4, 2013 by Chris*

**Please help! Taking exam Monday! Anatomy & Physiol**

Nutrients move out of the blood and into the body cells through which blood vessels? A. arteries B. veins C. capillaries D. lymphatic vessels
*May 16, 2013 by Linda*

**math**

Mrs. Roberts organized her class into four equal sized teams. Boys make 3/4 of each of the teams. If there are 2 girls on each team, how many students are there in the whole class? Please answer and explain.
*May 23, 2013 by Anonymous*

**math**

Let A=(0,0), B=(2,4), C=(17,4) and D=(15,0). Then ABCD is a parallelogram. A line through the point (0,−1) divides the parallelogram into two regions of equal area. The slope of this line can be written as a/b where a and b are positive coprime integers. Find a+b.
*June 24, 2013 by anonymous*

**math**

Let A=(0,0), B=(2,4), C=(17,4) and D=(15,0). Then ABCD is a parallelogram. A line through the point (0,−1) divides the parallelogram into two regions of equal area. The slope of this line can be written as a/b where a and b are positive coprime integers. Find a+b.
*June 25, 2013 by anonymous*

**physics**

A 7g bullet going at 300m/s hits and embeds itself into a 3.456kg block held on a frictionless table by a spring with k = 40N/m. Find the speed of the block and bullet after collision.
*November 8, 2013 by valerie*

**math/ algebra 1**

can someone please help me explain how they got this answer and can someone please show me the steps into solving this question? Q: Four more than the quotient of a number and three is at least nine.
*November 10, 2013 by ellie*

**MATH - Standard Form**

Mohammed copied this problem into his notebook. (3.4x10^5)(3.8x10^-9) A. Use the associative and commutative properties to rearrange the factors. B. Find the product and write it in standard form.
*November 20, 2013 by andra *

**maths**

the boys of a school can be arranged in 12, 15, 18 equal rows and also into a solid square. what is the least number of boys that the school can have? (hint: find the lcm) anwer is 900 explain
*December 1, 2013 by tanzil*

**physics 2**

if 120 g of hot water at 85 degree celsius is poured into an insulated cup containing 200 g of ice at 0 degree celsius. how many grams of liquid will there be when the system reaches thermal equilibrium?
*January 19, 2014 by phase change*

**Physics**

A 5.00-g bullet is fired into a 500-g block of wood suspended as a ballistic pendulum. the combined mass swings up to a height of 8.00 cm. What was the magnitude of the momentum of the combined mass immediately after the collision?
*March 19, 2014 by Jake*

**Social Studies**

Make a "what if" statement about how history may have changed in America if Zenger had not gone into the newspaper business. What if history tells us we do not have the right to free expression?
*April 7, 2014 by Anonymous*

**Basic Physics**

Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 41m above that pipe.
*August 25, 2014 by Ashley*

**algebra**

Jeremy has 4 1/2 cups of iced tea. He wants to divide the tea into 3/4 cup servings. use the model to find the number of servings he can make. Please help answer question. thanks would it be 9/2 multiplied by 4/3
*September 29, 2014 by Liz*

**Physics**

a point 22 caliber rifle fires a 1.8 gram bullet at a 400m/s into a block of wood. If the bullet penetrates to a depht of 10cm find the desaceleration of the bullet. The force exerheted on the bullet, and the time.
*November 5, 2014 by Guelmy*

**physics**

Daneil is bouncing on a trampoline. After a certain bounce he leaves the ground traveling at a speed of 2.54 m/s. How far into the air does he go? I need helllpppp I'm so bad a physics, I need to know what formula to use..
*November 6, 2014 by Ana*

**physics**

If the average gauge pressure in the vein is 14400 Pa, what must be the minimum height of the bag in order to infuse glucose into the vein? Assume that the specific gravity of the solution is 1.05. The acceleration of gravity is 9.8 m/s
*November 6, 2014 by andre*

**math**

Translate the following statement into an algebraic equation. Let x represent the number. 9 more than 10 times a number is 5 times that same number.
*May 7, 2007 by veronica*

**english/l.a**

Can someone give me some persuasuve essay topics? Persuasive essay- a essay that persuades someone into thinking your opinion.
*April 28, 2008 by Smart Kid*

**algebra**

a cable is cut into 2 pieces. One piece is twice as long as the other piece. Find the length of each piece of cable
*January 24, 2010 by brooke*

**chemistry **

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?
*October 29, 2010 by caroline*

**chemistry **

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 26.5 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?
*October 31, 2010 by Emily *

**Chemistry**

A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 27.1 g of water in a calorimeter, the temperature of the water increased from 25.00°C to 30.00°C. What is the specific heat of the metal?
*June 7, 2011 by Lance*

**Physical Science**

When you do 100 J of work on the handle of a bicycle pump, the pump does 40 J of work pushing the air into the tire. What is the efficiency of the pump?
*November 3, 2012 by Leah*

**Algebra 1**

Using the point-slope form of a line, y-4= -2(x+3) identify the slope. b. Transform this given equation into slope-intercept form.
*January 16, 2013 by Haylie*

**math**

Juan buys 18 meter of wire. He cuts the wire into pieces of 3 meters long.how many pieces of wire dose he cut?
*October 22, 2013 by Desmond*

**Physics**

a 5 kg crate falls from a height of 2.0 m into an industrial spring scale. When the crate comes to rest the compression of the spring is 24 cm. what is the spring constant?
*April 4, 2014 by Valerie*

**Science**

During the process of photosynthesis, solar energy is converted into: a. chemical energy. b. heat energy. c. thermal energy. d. mechanical energy. e. nuclear energy. a
*February 26, 2007 by Dave*

**computer education**

screen savers are used to protect the screen from having an image burned into the screen? true or false ,i think its true
*August 20, 2008 by M*

**Algebra**

When using -b/2a with functions, should I ignore the negative, figure out b/2a and then put a negative around it? Or should I turn 2a into -2a? Or should I go -b/-2(-a)? Thanks for clearing this up!!!
*November 8, 2009 by Erin*

**algebra**

A 30ft. cable is cut into 2 pieces. One piece is twice as long as the other piece. Find th length of each piece of the cable.
*January 24, 2010 by brooke*

**Math**

David carried 29 pounds of kitty litter in bags into the basement. There were 4 pound bags and 7 pound bags. How many of each size bag did he carry?
*October 20, 2010 by I. Ranson*

**windows xp command line**

create a batch subdirectory on the homework disk and any batch files frome the root directory into the batch subdirectory
*November 10, 2010 by divyesh*

**Chemistry Kb question need to clarify something**

the pKb for methylamine is 3.36, what is the Kb for methylamine? pKa+pKb= 14.00 Kb= 10^-pKb = 4.4x10^-4 is the answer but HOW?? what is punched into the calculator to get 4.4 x 10^-4??
*December 16, 2010 by Lori*

**problem solving**

theotis has to load a truck with tv sets. the cargo area of the truck is a rectangular prism that measures 1 1/2 ft. by 1 2/3 ft. by 1 1/3 ft...how many sets can be loaded into the truck?
*January 11, 2011 by casillas*

**chemistry**

A samples with a mass of 35 grams and a temperature of 97.3 degree c is placed into 75.0 g of water at 19.7 degree c. The final temperature is 22.3 degree c, what is the specific heat of the sample?
*January 25, 2011 by Linda*

**physics**

Raft is 4.2m wide and 6.4m long. when horse is loaded onto raft, the raft sinks 3 cm deeper into the water. Find the weight of the horse.
*November 30, 2011 by oopu*

**Math**

I need help Angle B = 90 degree - 28 degree 34' Angle B = 61.43333333... how do I convert decimal answer into degree minute second? please helpa and thank you
*January 13, 2012 by NeedHelp*

**maths**

Simon had 5/6kg of nuts. He repacked them into containers containing 1/3kg of nuts each. How many containers did he fill? How many nuts were left over?
*January 19, 2012 by urgently need an answer now pls*

**physics**

A 0.75 kg mass of copper changes temperature from 145.0 C to 46.0 C. How much heat was exchanged in Joules? Did the heat flow into the copper or out of the copper?
*January 26, 2012 by mario*

**Physics**

If it takes an average force of 5.4 N to push a 4.8-g dart 5.4 cm into a dart gun, assuming the barrel is frictionless, how fast will the dart exit the gun?
*June 2, 2012 by James*

**math**

j has a bag of 23 pieces of fruit the bag has 10 banana chips. what is the probability that j will choose a banana chip when he reaches into the bag? how to solve this problem
*November 27, 2012 by genesis*

**math**

solve the problem A drug is injected into a patient and the concentration of the drug is monitored. The drug's concentration, C(t), in milligrams after t hours is modeled by C(t) = (7t)/2t^2+4.
*April 7, 2013 by sara*

**computer**

You type in the value 56.4235 into the active cell. You then click Percentage Style Button. What will the cell show when completed? A 56.4235% B.56.4235% C.56.42% D.56%
*June 19, 2013 by TB*

**Trigonometry**

Given the equation 2cos^2x+sinx-1=0 1. Explain why this equation cannot be factored. 2. Use a trigonometric identity to change the equation into one that can be factored.
*November 24, 2013 by Jessy*

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