Wednesday

December 7, 2016
Total # Posts: 573

**statistics**

Scores on an English test are Normally distributed with a mean of 78% and a standard deviation of 4.5%. Find the Value of the first quartile.

*December 3, 2012*

**Physics**

Thank you Elena!

*November 26, 2012*

**Physics**

The grams for Aluminum are 2.0e2 and the temperature for Aluminum is 2.2e2. The grams for water is 5.0e2.

*November 26, 2012*

**Physics**

I'm sorry for Aluminum its 0.215 and for Copper its 0.0922

*November 26, 2012*

**Physics**

And the answer that I have is wrong

*November 26, 2012*

**Physics**

A 1.0 102 g piece of copper at a temperature of 460 K and a 2.0 102 g piece of aluminum at a temperature of 2.2 102 K are dropped into an insulated bucket containing 5.0 102 g of water at 280 K. What is the equilibrium temperature of the mixture? (Use the specific heats found ...

*November 26, 2012*

**Calculus II**

Does the series ln/n^2 converge using the L'Hoptial's rule also. I know you can use the integral test but I have also seen others using the L'Hopital's rule on a very similar funciton ln/n^3 to see that it does converge.

*November 16, 2012*

**Physics**

Two people are talking at a distance of 3.4 m from where you are, and you measure the sound intensity as 1.0 10-7 W/m2. Another student is 4.2 m away from the talkers. What sound intensity does the other student measure?

*November 13, 2012*

**Physics**

A 5-m-long string, fixed at both ends, has a mass of 9 g. If you want to set up a standing wave in this string having a frequency of 298 Hz and three antinodes, what tension should you put the string under? I got 0.009kg(a984.68m/s)^2/5=7090 N it still says its the wrong answer

*November 13, 2012*

**Physics**

Your saying g=9.06

*November 3, 2012*

**Physics**

For some reason its still saying its the wrong answer

*November 3, 2012*

**Physics**

It still says its the wrong answer. Let me calculate it again

*November 3, 2012*

**Physics**

Imagine you are an astronaut who has landed on another planet and wants to determine the free-fall acceleration on that planet. In one of the experiments you decide to conduct, you use a pendulum 0.47 m long and find that the period of oscillation for this pendulum is 1.43 s...

*November 3, 2012*

**Physics**

Imagine you are an astronaut who has landed on another planet and wants to determine the free-fall acceleration on that planet. In one of the experiments you decide to conduct, you use a pendulum 0.47 m long and find that the period of oscillation for this pendulum is 1.43 s. ...

*November 3, 2012*

**Calculus **

F(x) = x^5 ln x A) Find the interval on which f is increasing Find the interval on which f is decreasing B) Find the local minimum value of f C) find the inflection point (x,y) Find the interval in which f is concave up Find the interval in which f is concave down

*November 1, 2012*

**Science- physics**

A 10 kg lawnmower is pushed along by a force applied at a 20* angle to the horizontal. If the mower accelerates at 3.4 m/s what is this force?

*October 28, 2012*

**Statistics**

Suppose there are two defective items in a pool of five items. You want to test one item at a time until you identify the second defective item. Find following probabilities a. You need four tests. (i.e. The second defective item will be found at the fourth test.) b. You need ...

*October 21, 2012*

**physics**

all the following are true about water except that it: a has a very high specific heat capacity compared to ther substances. b. takes a long time to heat up. c. takes a short time to cool off. d. makes the earths climates milder.

*October 20, 2012*

**Math**

Each equal side of an isosceles triangle is 3 1/2 inches longer than the base. The perimeter of the triangle is 2 feet. Find the length of its base.

*October 15, 2012*

**PHYSICS!!**

A plane drops a hamper of medical supplies from a height of 4190 m during a practice run over the ocean. The plane’s horizontal veloc- ity was 111 m/s at the instant the hamper was dropped. What is the magnitude of the overall ve- locity of the hamper at the instant it ...

*October 4, 2012*

**Physics**

Pt. 1 Gas in a container is at a pressure of 2.3 atm and a volume of 6.1 m3. What is the work done on the gas if it expands at constant pressure to five times its initial volume? Answer in units of J My wrong answer: 56.12 Pt. 2: What is the work done on the gas if it is com- ...

*October 1, 2012*

**Physics**

Pt. 1 Gas in a container is at a pressure of 2.3 atm and a volume of 6.1 m3. What is the work done on the gas if it expands at constant pressure to five times its initial volume? Answer in units of J My wrong answer: 56.12 Pt. 2: What is the work done on the gas if it is com- ...

*October 1, 2012*

**Physics**

Suppose you throw a 0.058-kg ball with a speed of 11.0 m/s and at an angle of 31.5° above the horizontal from a building 12.3 m high. (a) What will be its kinetic energy when it hits the ground? (b) What will be its speed when it hits the ground?

*September 26, 2012*

**Physics**

A) Gravity pulls an area of wet soil and rock downward in a landslide B) An ... Many people know that the weight of an object varies on different planets, but did ... If the Earth's gravitational force causes a falling 74 kg student to accelerate .... the acceleration of ...

*September 23, 2012*

**physics**

A fire hose ejects a stream of water at an angle of 31.5 ° above the horizontal. The water leaves the nozzle with a speed of 24.3 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?

*September 19, 2012*

**spelling**

Foist

*September 17, 2012*

**math**

a recipe that will make 3 pie call for 7 cups of flour. write a proportion and solve it to find how many pies can be made with 28 cups of flour

*September 10, 2012*

**physics**

A hot-air balloon is rising upward with a constant speed of 3.06 m/s. When the balloon is 9.31 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?

*September 9, 2012*

**Ethis**

What is the historical and current impact of the biomedical issue in abortion?

*August 11, 2012*

**computer**

If int main() { int a=1; int *p; how do the following statements differ 1) p=&a; 2) *p=&a; 3) p=a; 4) printf("%d",p); 5) printf("%d",*p); and what does int **a mean

*July 8, 2012*

**physics**

The box decelerates at a rate of 3m/s and skids 24 meters becoming to a stop.How fast were you traveling when the box fell out.

*June 21, 2012*

**Chemistry**

The molar mass of Cl is 35.45 g/mol. What is the mass of the chloride atom in grams.?

*June 20, 2012*

**Physics - Center of Mass**

A baseball player uses a bat with mass mbat to hit a ball with mass mball. Right before he hits the ball, the bat's initial velocity is 36 m/s, and the ball's initial velocity is -20 m/s (the positive direction is along the positive x-axis). The bat and ball undergo a ...

*June 16, 2012*

**math**

Describe how you can use a number line to order the fractions 3/7, 5/7 and 1/7 from least to greatest.

*June 4, 2012*

**MATH**

You have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8 marbles in each sack?

*May 29, 2012*

**physics**

what is the mass of a playset that is moved with 580n of force for 11 seconds at 1.5 m/s?

*April 24, 2012*

**math**

There are 25 books in a bookcase. The books in the bookcase are all math, science, and history books. Seven of the books are math books. There are 4 fewer science books than history books. How many science books are in the bookcase?

*April 17, 2012*

**english**

Good job!

*March 29, 2012*

**physics**

NEW ZEALAND

*March 25, 2012*

**MATH**

THANK YOU I HAD A HARD TIME UNDERSTANDING

*March 13, 2012*

**MATH**

NUMERICAL EXPRESSION- 12 TIMES AS LONG AS 2 IN.

*March 13, 2012*

**math**

Adrian said that any 2 digit number with 2 identical,digits is divisible by 11. Do you agree? Explain.

*March 12, 2012*

**business**

Is anyone currently in intro to bus. need a study partner?

*March 7, 2012*

**physics **

regards bungee jumping How accurately must the weight of the jumper be known?

*March 7, 2012*

**Physics**

A pole-vaulter of mass 60.2 kg vaults to a height of 6.1 m before dropping to thick padding placed below to cushion her fall. (a) Find the speed with which she lands. (b) If the padding brings her to a stop in a time of 0.52 s, what is the average force on her body due to the ...

*March 4, 2012*

**Physics**

A man with a mass of 60 kg skis down a frictionless hill that is h = 2.2 m high. At the bottom of the hill the terrain levels out. As the man reaches the horizontal section, he grabs a 20-kg backpack and skis off a 2.0-m-high ledge. At what horizontal distance from the edge of...

*March 4, 2012*

**math**

Explain another way to help you find the product of 8x6 without repeated addition.

*February 8, 2012*

**english**

Select the sentence that is punctuated correctly. The neighbors’ new dog is small, quiet, and shy. The neighbors’ new dog is small quiet and shy. The neighbors’ new dog is, small, quiet and shy.

*February 2, 2012*

**Math**

On tuesday you all took the science and then your social studies final exams. What is the probability of you passing your social studies final exam given that you know that you passed your science final exam first ? The probability of you passing both is 50% and the ...

*January 6, 2012*

**Math**

thanks

*December 25, 2011*

**Math**

thats a negative 43.4% WHY?

*December 25, 2011*

**Math**

THe population of Anytown in 1960 was 1,576,230. In 1990 the population was 892,560. Find the percent change. AM REALLY CONFUSED PLEASE HElp

*December 25, 2011*

**MAth**

yea you had to round

*December 25, 2011*

**MAth**

so the first number would be 25.50 then 2nd would be 27.50

*December 25, 2011*

**chemistry**

Isotopes (select one or more): are chemicals that react only with protons. for an element have the same chemical properties. are atoms of an element that differ in the number of protons. are atoms of an element that differ in the number of neutrons. for an element are equal in...

*December 12, 2011*

**Question**

The scores on a test are normally distributed with a mean of 140 and a standard deviation of 28, what is the score that is one standard deviation above the mean?

*December 9, 2011*

**Physics**

Force of gravity=(Gm1m2)/(r squared) m1g=(Gm1m2)/(r squared) g=(Gm2)/(r squared) m2=Krypton's mass=7.1x10^23 kg r= Krypton's radius=3.3x10^6m G=6.6726x10^-11 (N x m^2)/kg^2 Plug in the numbers. You should get 28.265875m/s^2

*December 1, 2011*

**basic english**

B. is Correct

*November 16, 2011*

**physic**

Average Speed 1. In the 2008 Summer Olympics, Usain Bolt won the 100-m race in 9.69 s. What was his average speed? 2. Light from the sun reaches Earth in 8.3 min. The speed of light is 3.0108 m/s. How far is Earth from the sun? 3. In Major League Baseball, the distance between...

*November 3, 2011*

**sci prt 2 **

1. The Bugatti Veyron can go from zero to 60 mph in 2.5 seconds. (a) How many meters does it travel during the 2.5-s period? (b) What is the Bugatti¡¦s rate of acceleration? 2. A bullet traveling 220 m/s strikes a tree and penetrates 4.33 cm before stopping. (a) ...

*November 3, 2011*

**sci**

1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s penny gun straight...

*November 3, 2011*

**sci**

1. A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall from a height of 320 meter (1,050 feet). (a) How long will it take to fall? (b) How fast is it going when it hits the ground? 2. Aim the Mythbuster’s penny gun straight...

*November 3, 2011*

**science!**

1. A plane accelerated from a speed of 2.0 m/s at the rate of 3.0 m/s2 over a distance of 530 m. What is its speed after traveling this distance? 2. A jet plane must achieve a velocity of 71 m/s for takeoff. From rest and with a 1,000 m long runway, what must the acceleration ...

*November 3, 2011*

**Science **

At an accident scene, 276-m long skid marks are found on the road. If the car that made these skid marks can decelerate at –9.8 m/s2, how fast was the car going before braking?

*November 3, 2011*

**algebra**

ratio 3 to 5 mixed 20 oz?

*October 25, 2011*

**physics**

An apple falls off a tree branch located 35 meters off the ground. How many seconds does it take to hit the ground?

*October 12, 2011*

**physics**

A person with a mass of 77.5 kilograms is pushed on a sled across the frictionless surface of a frozen pond with a constant horizontal force of 14.8 Newtons. What is their acceleration?

*October 12, 2011*

**physics**

The force of gravity between two people is 4.9 x 10-13 Newtons. Person 1 has a mass of 61.3 kilograms, and person 2 has a mass of 93.5 kilograms. The value of G is 6.67 x 10-11 m3/s2 kg. How far apart are they from each other?

*October 12, 2011*

**physics**

a dike in Holland springs a leak through a hole of area 1cm squared at a depth of 2m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? can he do it?

*October 12, 2011*

**physics**

Hey Lijia. I'm well aware that you most likely will never see this, but you're a moron.

*October 9, 2011*

**Physics**

Thanks so much! I should have thought of the pythagorean therom, but why x^2=70^2-55^2 rather than x^2+(-55^2)=70^2?

*September 20, 2011*

**Physics**

You are given a vector in the xy plane that has a magnitude of 70.0 units and a y component of -55.0 units. What are the two possibilites for its x component? Please explain, thanks! :)

*September 20, 2011*

**physics**

using the kinematic equation: displacement=initial velocity*time+ .5(acceleration*time^2) delta x= 0*7.8+.5(2.3*7.8^2) delta x= .5(2.3*7.8^2) delta x= .5(2.3*60.84) delta x= 69.966 m with sig figs your answer would be 70 m hope this helps!

*September 20, 2011*

**Statistics**

consider a football team whom the numbers on active players' jersey are 29,41, 50, 58, 79,..., 10 (listed in alphabetical order of the players' names) Does it make sense to calculate the mean of those numbers? why or why not?

*September 10, 2011*

**American History**

what factors led to the failure of Republicans to secure rights for freedmen in the South in the years between 1865 and 1877

*August 26, 2011*

**math**

if i bought a car for $18,500 and price was 35% off what was original price and how do I do the math

*August 17, 2011*

**math**

if i bought a car for $18,500 and price was 35% off what was original price and how do I do the math

*August 17, 2011*

**math**

The distance from the center of a round table top to the edge of the table top is 4 ft. What is the area of the table top?

*August 12, 2011*

**informal logic**

Since Jessica’s participation in local politics increased significantly after she joined her school’s political science club, it is clear that her involvement in that club led her to take an interest in politics. The argument above is flawed because

*August 9, 2011*

**Mathematics**

The standard deviation of given population is 4.5 with a mean of 60 and the refit population has a standard deviation of 5.2 with a mean of 75. Calculate the coefficient of variation for both populations and comment on the results.

*July 22, 2011*

**Mathematics**

A card is selected at random from an ordinary pack of 52 playing cards.state the probability the card is a club.

*July 22, 2011*

**Chemistry**

A sample of glucose, C6H12O6, contains 1.300x10exponent21 atoms of carbon. How many atoms of Hydrogen does it contain? How many molecules of glucose does it contain?

*June 15, 2011*

**Algebra**

The following logistic function describes the percent of the population of a city that will purchase the local newspaper. P(t)=(65)/(1+34e^(-0.223 t)) "t" is the number of days since the newspaper is first launched. When will the newspaper reach 60% of the population

*June 13, 2011*

**IT Fundmentals of Programming w/ Algoriths & Logic**

How would I write an object-oriented pseudocode for a system that allows a user to enter their name into a text box? When they press the Go button a message will be displayed in a label that says “Hello” and their name.

*June 11, 2011*

**Math please help please help**

Out of 42 kids in a class twice as many failed Ela as math,4 failed both. If 7 failed neither, find how many failed each subject. Please help and show work it would be great thanks i really need help thanks

*June 6, 2011*

**chemistry **

What is the molarity of hcl is 35 ml is neutralized. By 500 ml of M NaOH?

*May 23, 2011*

**math**

y=(-3/4)x-2

*May 1, 2011*

**science**

A solution of HNO3 has a pH of 4.5, What is the molarity of HNo3?

*April 26, 2011*

**Math**

During the first part of a trip, a canoeist travels 33 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip? The speed on the first ...

*April 21, 2011*

**Statistics**

The computed t was -.926 with df of 24 for p>.o5. what may you say about the null hypothesis?

*April 20, 2011*

**space**

How much is 2000 kg in outer space?

*April 19, 2011*

**Math**

Rhombus RHOM with acute angle H

*April 18, 2011*

**Math**

kkkkk

*April 18, 2011*

**Education **

Describe the difference between word-level skill and text-level skill attainment for ELL students. Then, describe specific things teachers can do to increase ELL students' text-level skills.

*April 4, 2011*

**Education **

Compare and contrast the teaching of comprehension strategies to ELL students and to native English speakers.

*April 4, 2011*

**Education**

What are some words of wisdom to think about when teaching ELLs?

*April 4, 2011*

**Education**

How do you modify a lesson to teach ELLs?

*April 4, 2011*

**Education**

How is an ELL's level of language proficiency determined? How do you modify your assessments to evaluate ELLs understanding of content?

*April 4, 2011*

**spanish**

help me translate please!! i tried it myself but it was a mess! :( My name is Isabella and I am 14 years old. I live with my parents and two brothers in the outskirts of Newport. My school is a few miles away from where I live, I go to school by coach but I used to go to ...

*March 12, 2011*