Thursday
December 8, 2016

Posts by Courtney

Total # Posts: 776

Physics
An astronaut throws a ball with mass m to the right with speed v. It strikes the wall of the space station and rebounds, moving left with a speed V/2. What was the magnitude of the impulse of the ball caused by the collision?
November 10, 2016

Math
A box contains some white balls and some blue balls. There are 5 more blue balls than white balls. One ball is removed at random and not replaced. A second ball is then removed at random. The probability that the balls are different colours is 52/105. Find the probability that...
November 10, 2016

Math
How is it 0.8? What is the working out?
November 10, 2016

Math
A box contains some red balls and some blue balls. There are four more blue balls than red balls. A ball is removed at random, replaced and a second ball randomly removed. The probability that the two balls are different colours is 21/50. How many balls of each colour are in ...
November 10, 2016

Science
A screwdriver with the one similar shaft in a 4 cm handle is used to tighten a screw the mechanical advantage is
October 22, 2016

College algebra
2.8
October 20, 2016

SOCIAL STUDIES 1 QUESTION PLZ HELP ASAP
How did European affect Africa during the 18 hundreds how did Africa Africans respond in the 1900 Plzzzzzz help I swear I have read my text read a link about but I still don't understand plz help!!!!!#
October 6, 2016

Language art
Consider the main characters from " The Stolen Day and the night the bed fell in a paragraph discuss which character learns the most and which one learns the least. PLZ ANSWER ASAP and yes I have read both stories
October 6, 2016

SOCIAL STUDIES
I understand that part but I don't understand what's written look plz can u just tell me I have been working really hard plz I'm not lie in just help me or can you help me on my language art question
October 6, 2016

SOCIAL STUDIES
What? I didn't understand
October 6, 2016

SOCIAL STUDIES
Idk I just read it and nothing Pl ms.sue help
October 6, 2016

SOCIAL STUDIES
Oooooooh ok thank you ok ok last one how did the European affect Africa during the 1800s how did the Africans respond in the 1900s plz help I'm so sorry for the bother but plz help
October 6, 2016

SOCIAL STUDIES
OK thank you so much can you also answer this one. what role do women play in the economy of West and central Africa. I swear I already read my text and I got nothing
October 6, 2016

SOCIAL STUDIES
In what areas of North Africa do the majority of the people live and why? I know that they live by the Nile river but why is what don't know plz help I have been doing everything only come here if it's important plz help thank you
October 6, 2016

Physical Science
You drop a water balloon off of a tree branch, and you time the drop time at Δt = 0.8 sec, from the instant you drop it to the instant it impacts the sidewalk. What is the height of the tree branch?
September 5, 2016

Chemistry
If the density of carbon is 3.51 g/cm3, and you have a small diamond (pure carbon) that has a mass of 0.0270 grams, what is the volume?
September 4, 2016

geometry
SM=3x−4, and RN=9x−20. Find the value of x. A. 16 B. 4 C. 12 D. 8
July 26, 2016

geometry
Two sides of a triangle have lengths 4 and 7. Which of the following can NOT be the length of the third side? A. 4 B. 7 C. 11 D. 5
July 26, 2016

geometry
The lengths of two sides of an isosceles triangle are 8 and 10. The length of the third side could be? A. either 8 or 10 B. 6, only C. 8, only D. 10, only
July 26, 2016

Economics
Suppose you are a producer of friendship bracelets. How would the following events affect your/the market's willingness and ability supply friendships bracelets? Match the event on the left to the proper determinant on the right. 1. The price of friendship bracelets ...
July 21, 2016

Math
You have tow ropes one 14inches the other 23 inches if you if you need three feet of rope what do you do use RDW to solve
April 10, 2016

English
Sadly yes that's how cruel the world is
April 10, 2016

Calculus
Find the equation of the line tangent to the curve y=(x^2+3)^1/2 that is perpendicular to the line 2x-y+7=0
March 12, 2016

Trig
Use the Law of Cosines to determine the indicated angle θ. (Assume a = 17, b = 10, and c = 20. Round your answer to one decimal place.)
March 2, 2016

English
The MLA format for citing an entire website includes A. an article title. B. source from which you found the website. C. electronic publication information. D. author's apparent credibility.
March 1, 2016

English
Which type of Internet resource would be the most reliable in providing accurate information? A. A general reference site such as Encyclopedia B. An email you received from your instructor C. An email listserv D. An online newsgroup dedicated to your topic
March 1, 2016

English
It's necessary to use a/an _______ when a quotation is introduced by a verb. A. quotation mark B. comma C. ellipse D. colon
March 1, 2016

geometry
A 25 meter ladder is leaned against a tall building. If the ladder makes a 30 degree angle with the ground, how high up on the building (in meters) does the ladder fall?
February 24, 2016

Physics
Suppose at one point along the Nile River a ferryboat must travel straight across a 1.29-mile stretch from west to east. At this location, the river flows from south to north with a speed of 2.58 m/s. The ferryboat has a motor that can move the boat forward at a constant speed...
February 4, 2016

READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!
Thanks guys!!
January 25, 2016

READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!
what about 2?
January 25, 2016

READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!
On #1 I meant to put A.
January 25, 2016

READING ASAP ASAP PLEASE HELP ME!!!!!!!!!!!!!!!!!!
CAN YOU CHECK IF I"M CORRECT? *=My answer. Which is the best example of the use of rhyme? A.the beat of the drum B.Fresh green grass C. A wild little girl* D.The kindness of strangers 2. What is the best example of a simile? A.Mary's shout rattled the window. B. Her ...
January 25, 2016

geography
thanks you!
January 22, 2016

geography
Who invented T.V's Phones, and computers?
January 22, 2016

SCIENCE ASAP HELP PLEASE
So is the answer D???
January 21, 2016

SCIENCE ASAP HELP PLEASE
which of the following features make earth and venus similar to each other ? A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****
January 21, 2016

Physical Education
never mind I got it
January 19, 2016

Physical Education
Mandy wants to win the local youth tennis tournament next fall. Her coach has said that her serve is powerful enough, but she suggests Mandy train with a jump rope to improve her ability to cover more ground on the court when she’s playing. Why would her coach suggest ...
January 19, 2016

MATH NEED HELP ASAP!!!!!
Ok Ok... take it easy
January 15, 2016

MATH NEED HELP ASAP!!!!!
So I'm wrong
January 15, 2016

MATH NEED HELP ASAP!!!!!
so am i correct?
January 15, 2016

MATH NEED HELP ASAP!!!!!
I think B
January 15, 2016

MATH NEED HELP ASAP!!!!!
Henry's current age is 10 times Justin's current age. in 6 years,Henry's age will be 4 times Justin's age. Which system of equations can be used to calculate H Henry's current age J Justin's current age? A. J=10h j+6=4(H+6) B.J=H+6 J+4=H+10 C.H=10J H+6=...
January 15, 2016

Math ASAP ASAP!!!!!
yayaayay thanks Damon :)
January 15, 2016

Math ASAP ASAP!!!!!
Ms.Sue
January 15, 2016

Math ASAP ASAP!!!!!
IS the answer 400?
January 15, 2016

Math ASAP ASAP!!!!!
Ok But what number do i have to add
January 15, 2016

Math ASAP ASAP!!!!!
Earl earns a weekly salary of $150 plus 20% of amount of his sales for the week. Last week he earned $230. The equation below can be used to find "s" the amount of his sales in dollars last week 230=150+0.2s What was the amount of Earl's sales last week? A.$180 B...
January 15, 2016

Math/Physics
Lil decides to estimate the height of the Empire State Building. She measures the angle θ of elevation of the spire atop the building as 19°. After walking x = 9.10 ✕ 102 ft closer to the building, she finds the angle to be 23.8°. Use Lil's data to ...
January 13, 2016

Chemistry
Your question is very broad, because there are many types and techniques available. advantages: small sample size fast differentiates isotopes can be combined with GC and LC to run mixtures, or can be run in tandem for proteins etc. disadvantages: doesn't directly give ...
December 29, 2015

Science
aaaa OK SO Is it A?
December 26, 2015

Science
How can volcanic eruptions change the surface of the earth? by creating large deposits of coal by creating new islands and land by lowering land levels several feet by decreasing the level of the ocean I think its C
December 26, 2015

Happy Christmas and Merry New Year!!
MERRY CHRISTMAS
December 22, 2015

math
Ok So how do you solve 32b+55
December 22, 2015

Reading
Sorry about that lol merry Christmas Mr.Reed :D
December 21, 2015

Reading
ohhhhh gotcha ya thanks :)
December 21, 2015

Reading
Jonny Tremain by Ester Forbes
December 21, 2015

Reading
Describe Johnny’s relationships with Cilla, Lavinia Lyte, and Dove now that Johnny is living with Rab and his family. What do these relationships reveal about Johnny and his personal growth?
December 21, 2015

math
how do you solve 3x+11
December 21, 2015

P.E
Thanks guys :)
December 21, 2015

P.E
Which of the following does not describe why many people with eating disorders do not see help because they_____. A. are embarrassed b.deny there is a problem C. find comfort in food D are ashamed of their behaviors I don't now if its C or D but My personal think its D Ms....
December 21, 2015

Physics
A golf ball is dropped from rest from a height of 8.30 m. It hits the pavement, then bounces back up, rising just 5.00 m before falling back down again. A boy then catches the ball when it is 1.10 m above the pavement. Ignoring air resistance, calculate the total amount of ...
December 16, 2015

Physics
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.04 m/s. The car is a distance d away. The bear is 28.8 m behind the tourist and running at 7.26 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
December 16, 2015

Phsics
A car is traveling along a straight road at a velocity of +38.8 m/s when its engine cuts out. For the next 2.01 seconds, the car slows down, and its average acceleration is . For the next 6.36 seconds, the car slows down further, and its average acceleration is . The velocity ...
December 16, 2015

English
In the story "Why, You Reckon," how old would you say the characters are?
November 9, 2015

math
1.5<n and n<2
November 8, 2015

Social Studies
Lol so true and @ddjmike is100% right thanks sooooo much lifesaver literally ~xoxo Courtney
October 21, 2015

College Chemistry
the acid dissociation constant for acetic acid is 1.85x10^-5. Calculate the pH at the equivalent point and the pH at one-half the equivalence point for the titration of 25.00 mL of 0.100 M acetic acid with 0.100 M NaOH?
October 18, 2015

algebra 2
Find the slope of the line passing through the points (3, -1) and (0, 8)
October 1, 2015

Physics
A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.44 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.
September 29, 2015

Physics
A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.50 s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340 m/s.
September 28, 2015

Biomechanics
A cyclist is pedaling on his bicycle. If they travelled 18.1 km in 1.0 hours and the diameter of his wheel is 69.3 cm, what was the cyclist's average angular velocity in revolutions per minute (rpm)?
September 28, 2015

physics
2 forces pull horizontally on a heavy box. force b is directed 20 west of north and pulls twice as hard as force a. the resultant of these two pulls is 400N directly northward. using vector components to show two possible solutions to this problem: a. what are the two possible...
August 21, 2015

Physics
are water waves at the beach with a velocity of 1.75m/s and a wavelength of 3.213 and frequency of 1/1.84Hz considered fast?
August 19, 2015

Pharmacy Tech Math
Rx: Insulin 75 units/250ml over 3.5hrs. The IV administered motion set delivers 30gtts/ml. What is the flow rate in gtts/min?
June 27, 2015

math
Brian has a bag that contains 14 red marbles and 12 yellow marbles. He selects a marble at random, and then, without replacing the first one, selects another marble at random. What is the probability that Brian selects a red marble and then a yellow marble? Round your answer ...
June 17, 2015

calculus
A box with a square base is to be constructed with a surface area of 726 square centimeters. 1. Draw a diagram of the box. Label the diagram appropriately with variables. 2. Write an objective equation and a constraint equation (label each one as objective or constraint). 3. ...
April 8, 2015

Statistics
Find the margin of error for a 95% confidence interval for estimating the population mean when the sample standard deviation equals 100, with a sample size of (i) 400, (ii) 1600. What is the effect of the sample size? (b) Find the margin of error for estimating the population ...
April 5, 2015

Chemistry
In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 72.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C. Assuming the solution has a heat capacity of 4.18 J/°C&...
February 19, 2015

Organic Chemistry
Gas Chromatography: The internal standard technique is used. A volatile component which does not interfere with the GC analysis (i.e. it gives a separate peak) is added to the sample which is then analyzed. For example, 10.0 mg of D was added to 50.0 mg of the mixture of A, B...
February 15, 2015

math
Tickets to a concert cost $12 for kids and $15 for adults. A total of 300 tickets were sold and total receipts were $4140. How many were adult tickets and how many kids?
February 4, 2015

PHYSICS
A ball is shot upwards with an initial speed of 31 m/s. While it is in the air it experiences a constant downwards acceleration of 10 m/s2. Find its velocity 1, 2, 3, and 4 seconds after being released.
February 4, 2015

history help
12. __________ and _________ first attracted settlers to the West.
November 18, 2014

Genetics
Sorry, one codon is composed of three nucleotides that code for one amino acid. Therefore, a protein of 375 amino acids would have a coding region on the mRNA strand with 375*3 nucleotides.
November 16, 2014

Genetics
I'm sorry, MULTIPLIED by 3
November 16, 2014

Genetics
One codon is composed of three amino acids, so the coding region would be 375 divided by 3. Your welcome:)
November 16, 2014

Physics
For the situation: "A moving crate slides to a halt on a rough surface" Does temperature increase, decrease, or not change? Are work and heat positive, negative, or zero? Does thermal energy increase, decrease, or not change? My answer key says temperature increases...
November 16, 2014

Physics
An 8.46 kg block drops straight down from a height of 0.90 m, striking a platform spring having a force constant of 9.90 102 N/m. Find the maximum compression of the spring
November 11, 2014

PHYSICS
Why does air pressure decrease with increasing altitude? (SELECT ALL THAT APPLY) The weight of the air above is smaller The weight of the air below is smaller Less air above pushes down There is more air below to push up more strongly Cold air is less dense Hot air rises
October 29, 2014

PHYSICS
Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75X 10^3 kg/m^3 at the bottom of a 12.5 m deep lake
October 29, 2014

Physics
Why does air pressure decrease with increasing altitude? a) The weight of the air above is smaller b) The weight of the air below is smaller c) Less air above pushes down d) There is more air below to push up more strongly e) Colder air is less dense f)Hot air rises
October 28, 2014

Physics
In a huge oil tanker, salt water has flooded an oil tank to a depth of h2 = 4.50 m. On top of the water is a layer of oil h1 = 7.55 m deep, as in the cross-sectional view of the tank as shown in the figure. The oil has a density of 0.700 g/cm3. Find the pressure at the bottom...
October 28, 2014

Physics
Calculate the pressure on the top lid of a chest buried under 4.30 meters of mud with density 1.75 103 kg/m3 at the bottom of a 12.5-m-deep lake
October 28, 2014

BIOLOGY
Which of the following is/are true about where electrons end up? The last molecule of the ETC in the mitochondrian donates electrons to water and releases oxygen The last molecule of the ETC in the mitochondrion donates electrons to oxygen and makes water NADH and FADH2 ...
October 22, 2014

BIOLOGY
Fermentation: (Select all that are true) Uses pyruvate to accept electrons Uses pyruvate to donate electrons Regenerates NADH Regenerates NAD+ Directly makes ATP Allows glycolysis to continue in the cytoplasm making ATP Allows oxidative phosphorylation to continue int he ...
October 22, 2014

Physics
How would you set this up? A 250-N sphere 0.20 m in radius rolls without slipping 6.0 m down a ramp that is inclined at 28° with the horizontal. What is the angular speed of the sphere at the bottom of the slope if it starts from rest?
October 21, 2014

Chemistry
2NaN(3) > 2 Na +3N(2) What mass of sodium azide must be reacted to inflate and air bag to 70.0 L at STP?
October 19, 2014

Physics
A 55-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 29 m/s. If the ball is in contact with the player's head for 16 ms, what is the average acceleration of the ball? (Note that the force of gravity may be...
October 3, 2014

Physics
A 2.87 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s collides with and sticks to a 1.96 kg object initially moving in the negative y-direction with a velocity of -2.55 m/s. Find the final components of velocity of the composite object. (...
October 2, 2014

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