Sunday

May 24, 2015

May 24, 2015

Total # Posts: 924

**Physics**

An open train car, with a mass of 2150 kg, coasts along a horizontal track at the speed 2.29 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.67 s at the rate of 441 kg/s. What is the car's speed after the loading is ...
*November 19, 2012*

**Physics**

A 70.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the 0.430 kg ball precisely at the peak of his jump, when he is 19.2 inches off the ground. He hits the ground 1.61 inches away from where he leapt. If the ball ...
*November 19, 2012*

**Physics**

During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 148-g baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 10.1 m/s, shatters the glass as it passes through, and leaves the window ...
*November 19, 2012*

**Physics**

An unfortunate astronaut loses his grip during a spacewalk and finds himself floating away from the space station, carrying only a rope and a bag of tools. First he tries to throw a rope to his fellow astronaut, but the rope is too short. In a last ditch effort, the astronaut ...
*November 19, 2012*

**Physics. Please please help!**

Shouldn't the answer be 1.62*10^4V? Unless i'm putting the numbers in wrong. Please help
*November 14, 2012*

**Physics. Please please help!**

A charge Q = +4.5 uC is located at the origin and is fixed so that it cannot move. A small object with mass m = 2.0 g and charge q = +8.0 uC is released from rest at point A on the x-axis at x = 2.0 cm. The small object moves without friction along the x-axis under the ...
*November 14, 2012*

**calculus**

A five feet piece of wire is cut into two pieces. One Piece is bent into a square and the other is bent into an equilateral triangle. Where should the wire be cut so that the total area enclosed by both is minimum.
*November 14, 2012*

**Physics**

"You will measure the tension T, the mass m, and the length L of your spring. In terms of these variables, what is the expected frequency of the fundamental standing wave?" I found the fundamental frequency to be: f = 1/2L * sqrt(T/m/L)?
*October 31, 2012*

**Math**

write an algebraic expression then evaluate, given n=2 5 less than the quotient of -10 and a number is the answer (-10 / 2) - 5 = 0
*October 30, 2012*

**Physics**

"A slinky that satisfies v = sqrt(T/_mu) is stretched 12m. The mass of the slinky is 0.8kg. The tension on the slinky is 4N. What is the expected wave speed?" To get mu, I divided the mass by the length then plugged that into the equal and solved for v but I'm ...
*October 30, 2012*

**math**

260 divided by 10=26 does (260 divided by 10)x5=26x5
*October 29, 2012*

**calculus (math)**

Simplify exactly log_2 1/16
*October 27, 2012*

**math**

how could you use the product of 108 and 4 to find the product of 324 and 4?
*October 24, 2012*

**math**

an airplaine has an altitude of 20,000 feet. it climbs another 5,000 feet to avoid a storm. What integer expresses the position of the airplane compared to ground level?
*October 24, 2012*

**math**

-4 - (-8) = I got 4 is this correct -2 - (-6) = Again I got 4 is this also correct
*October 23, 2012*

**PHYSICS H**

suppose an elephant and a feather fall from a skyscraper. in the presence of air resistance, the elephant would fall faster because...list all that apply. a) acceleration of gravity is greatest for the elephant b) elephant experiences a smaller air resis. force c) the greater ...
*October 23, 2012*

**Physics**

Why is it necessary to collimate the light source before using the prism to disperse the light? A. If white light enters the prism with different angles, some of the blue light will exit the prism with the same angle as the orange light. B. If white light enters the prism with...
*October 22, 2012*

**math**

A spiiner was spun 16 times. The results are shown in the table below. yellow = 5 white = 4 red = 0 blue = 2 green = 2 orange = 3 whch colors' experimental probability matches its theoretical probability a. yellow, green and orange b. white, red and orange c. yellow, blue ...
*October 21, 2012*

**engineering**

A string is fit snugly around the circumference of a spherical hot air balloon. More hot air is added (probably by a prominent scientist’s lecture) and it now takes an additional 12.4 feet of string to fit around the circumference. What is the increase in diameter?
*October 17, 2012*

**Math. Have answer, please show work**

In a tracer method the potassium isotope 42K is used for labelling. The half life of 42K is 12.5 hours. If No is original number of atoms, how many hours will it take until only (1/1024) No Atoms remain? The answer is 125 hours but I do not know how to get this. Please help!
*October 13, 2012*

**math. solve for t**

im getting 104 hours but the correct answer is 125 hours?
*October 13, 2012*

**math. solve for t**

1/1024=42*0.5^(t/12.5) Solve for t. Please show work. Much appreciated!
*October 13, 2012*

**Math**

u-2√u=3. what is u?
*October 13, 2012*

**Chemistry**

The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1.000 g glucose is combusted in a bomb calorimeter. If the calorimeter contains 875 g H2O and the bomb has a heat capacity of 457 J/C, what is the temperature increase of the bomb calorimeter? the specific heat...
*October 11, 2012*

**Chemistry**

The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1.000 g glucose is combusted in a bomb calorimeter. If the calorimeter contains 875 g H2O and the bomb has a heat capacity of 457 J/C, what is the temperature increase of the bomb calorimeter? the specific heat...
*October 11, 2012*

**Chemistry**

The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1.000 g glucose is combusted in a bomb calorimeter. If the calorimeter contains 875 g H2O and the bomb has a heat capacity of 457 J/C, what is the temperature increase of the bomb calorimeter? the specific heat...
*October 11, 2012*

**logic**

The sentence "P → Q" is read as
*October 7, 2012*

**CHEMISTRY! HELP!**

I have a hard time getting this someone help me? Astronauts often use the unit light year to express intergalactic distances. If light travels 3.00 x .10^10 cm/s and one year is defined as 365 days, how many kilometers does light travel in one year?
*October 6, 2012*

**Math**

Explain in words, how you would solve: 3(n-8) = 12 + 2n
*October 4, 2012*

**physics/math**

If you are driving 116 km/h along a straight road and you look to the side for 3.0 s, how far do you travel during this inattentive period?
*October 1, 2012*

**Math. due tomorrow**

A female moth lays nearly 150 eggs. In on year there may live up to five generations. Each larva eats about 20mg of wool. Assume that 2/3 of the eggs die and that 50% of the remaining moths are females. Estimate the amount of wool that may be destroyed b the descendants of one...
*October 1, 2012*

**Reading**

Is the book KICKOFF! by Tiki & Ronde Barber with Paul Mantell Fiction or non-fiction?
*September 24, 2012*

**math**

we got 119 3/20 for the perimeter
*September 20, 2012*

**math**

the dims are of the poster and then he adds 4 1/2 inch
*September 20, 2012*

**math**

a poster reproduces the Mona Lisa in the original size, but adds a 4 1/2 inch border around each side. What is the perimeter of this poster if the length is 30 3/10" and width is 20 7/8"?
*September 20, 2012*

**math**

anoter poster reproduces the Mona Lisa in the original size, but adds a 4 1/2 inch border around each side. What is the perimeter of this poster if the length is 30 3/10" and width is 20 7/8"?
*September 20, 2012*

**Physics**

(a) 114.147 m (b) 778.4605 m
*September 18, 2012*

**Math**

In 45 seconds. 9,18,27,36.45 15,30,45
*September 18, 2012*

**math**

I thought I needed to do 9/10 x 7/1 which is 63/10 = 6 3/10
*September 18, 2012*

**math**

thank you
*September 18, 2012*

**math**

when planting trees in a forest, the US Forest Service recommends giving each seedling about 1/200 acre on which to grow. About hw many seedling should be planted in 1/3 of an acre? How would I show my work on this? would it be 1/3 x 200/1 = ?
*September 18, 2012*

**math**

Thank you!
*September 17, 2012*

**math**

still stuck on this one please help Marissa plans to use 50 sheet of aper for a scrapbook. How much thicker will the scrapbook be if she uses heavyweight (which is 2/5 in for 100 sheets) instead of lightweight paper (which is 3/10 in for 100 sheets)?
*September 17, 2012*

**math**

I do understand that, but if he uses 1/4 of the paper for the english section and 1/3 of the paper of the other 3/4 for the math section. How would I show this.
*September 17, 2012*

**math**

Eddie buys 100 sheets of heavyweight paper to make a notebook. He places 1/4 of the sheets in a section for English and 1/3 of the reamining sheets in a section for math. Which section is thicker if the 100 sheets of heavyweight paper is 2/5 in per 100 sheets?
*September 17, 2012*

**Business Management-Principles of Management**

Can anyone post the correct answers base on their grades
*September 14, 2012*

**math**

Juan's class has 10 girls and 15 boys. the ratio fo girl to boys in Steven's class is the same as the ratio of girl to boys in Juan's class.How many girls are in Steven's class. Picture/diagram of my composed solution. We know that the ratio is 1:1.5 with a ...
*September 12, 2012*

**math word problem**

Weds to Thurs
*September 10, 2012*

**Biology**

How are radioisotopes used to make biochemical reactions?
*September 8, 2012*

**math**

Two trains are traveling the same direction, train a is going 60 mph and train b is going 70 mph, after one hour how long will it take train a to reach the point train b was at the hour marker.
*September 2, 2012*

**math**

unit rate for 30 miles on 1.5 gal not sure how to write it
*August 29, 2012*

**math**

what is the unit rate $16 for 32 photos is it 16/32= .50/1
*August 29, 2012*

**math**

list all prime numbers under 20 and the find GCF for 62 and 80 using factoriztion. is the answer 2 x 2 =4
*August 15, 2012*

**math**

list all prime under 20. then find the GCF for 64 and 80 use prime factorization.
*August 15, 2012*

**Chemistry**

They did the right work but the answer is 40 grams. That is what it says in the book.
*August 10, 2012*

**math**

Ms Sue when you said 25 in the overlapping section of math and english did mean math and history/
*August 6, 2012*

**math**

need to make a venn diagram using 3 circles. A survey on subject being taken by 250 students at a certain college revealed the following info: 1. 90 were taking math 2. 145 were taking history 3. 88 were taking english 4. 25 were taking math and history 5. 38 were taking ...
*August 6, 2012*

**Math**

If I have cards numbered 1 through 40 and I randomly draw 3 then replace them, shuffle them and draw three again what are the odds of drawing one of the numbers more than once
*July 31, 2012*

**physics**

A vertically hanging spring has a mass of 50 N hanging from it. Under these conditions, the spring stretches 10 cm. The spring is then placed on a horizontal table and stretched 20 cm. What force is required in the second scenario?
*July 18, 2012*

**Principles of Management - Strategic Management**

1.d,2.b,3.c,4.a,5.a,6.c,7.a,8.d,9.b,10.b,11.c,12.b,13.c,14.a,15.b,16.b,17.d,18.c,19.d,20.b I did miss one but not sure which one it was.
*July 10, 2012*

**us history grade 7**

what are the pros and cons of the fur trade?
*June 21, 2012*

**Physics**

"A person is playing a small flute 10.75 cm long, open at one end and closed at the other, near a taut string having a fundamental frequency of 600.0 Hz. If the speed of sound is 344.0 m / s, for which harmonics of the flute will the string resonate? In each case, which ...
*June 4, 2012*

**Physics**

Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 60.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses. What focal ...
*May 29, 2012*

**Physics**

Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 60.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses. What focal ...
*May 28, 2012*

**Physics**

Ordinary glasses are worn in front of the eye and usually 2.00 cm in front of the eyeball. A certain person can see distant objects well, but his near point is 60.0 cm from his eyes instead of the usual 25.0 cm. Suppose that this person needs ordinary glasses. What focal ...
*May 28, 2012*

**English**

Bssmyale
*May 22, 2012*

**math**

Compute 9(sub)C(sub)6
*May 17, 2012*

**Physics**

The range away from the stage doesn't matter?
*May 4, 2012*

**Physics**

oh sorry the diameter is 8.4mm and the question is asking for the How much energy is transferred to her eardrums each second ?
*May 4, 2012*

**Physics**

A fan at a rock concert is 45.0 m from the stage, and at this point the sound intensity level is 108 dB. Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate . Typically, the diameter of this membrane is about 8.40 m in humans I solved for ...
*May 4, 2012*

**social 10 COULD SOMEONE PLEASE HELP ME!**

Historical Globalization & IMPERIALISM I HAVE POSTED ABOUT 8 QUESTIONS THAT I REALLY NEED THE ANSWERS TO, I HAVE SAT HEAR ALL WEEKEND AND JUST DON'T GET THEM I HAVE JUST GOT MYSELF SO CONFUSED SO COULD YOU PLEASE HELP ME, I'M SO TIRED AND FED UP! THANK YOU SO MUCH (I ...
*April 16, 2012*

**social 10**

could you please help me with 6 differents of imperialism in Canada and imperialism in India?
*April 16, 2012*

**social 10**

What major way did the new imperialism of the late 1800s to early 1900s differ from the imperialism of the previous few ceenturies? PLEASE HELP ME!
*April 16, 2012*

**social 10 **

what would be a good statement to describe the differences between globalization & imperialism? PLEASE HELP!
*April 16, 2012*

**social 10 **

(forms of imperialism) What are 3 ways that the new imperialism led to World War 1? PLEASE HELP!
*April 16, 2012*

**social 10**

Why is the "new imperialism" called the first era of globalization? PLEASE HELP!
*April 16, 2012*

**social grade 10**

Historical Globalization & imperialism PLEASE HELP! Did imperialism lead to a better life for European immigrants to Canada?
*April 16, 2012*

**social 10**

historical globalization & imperialism PLEASE HELP! Did imperialism lead to a better life for Canada's indigenous people?
*April 16, 2012*

**social 10 **

Historical Globalization & imperialism Should the Europeans have tried to change the beliefs of thr people in their colonies during imperialist times? could you please give me some reasons. Please help
*April 16, 2012*

**social 10**

Historical globalization & imperialism If my ancestors were not indigenous Canadians what 3 motives for imperialism would make them immigrate to Canada? please help
*April 16, 2012*

**historical globalization $ imperialism grade 10**

what does eurocentric attitude means?
*April 16, 2012*

**history grade 10**

Could you please help with should the Europeans have tried to change the beliefs of the people in their colonies durind imperialist times,what do you think the reasons would be?
*April 15, 2012*

**history grade 10 **

Could you please help explain if imperialism lead to a better life for Canada's indigenous people?
*April 15, 2012*

**history grade 10**

Could you help explain if imperialism lead to a better life for immigrants to Canada?
*April 15, 2012*

**history grade 10**

slavery before 1844, how were the slaves treated, did they have any right?
*April 15, 2012*

**social**

should the Europeans have tried to change the beliefs of the people in their colonies during imperialist times? WHY?
*April 15, 2012*

**social**

In two different pictures 'Christopher receiving gifts' and 'Columbus taking possession of the new country' What are the similarities? What are the differences?
*April 15, 2012*

**social studies**

slavery before 1844 was there any rights or rules for slaves or their familys. could they just beat them all the time?
*April 15, 2012*

**math**

how did you get this answer
*April 12, 2012*

**math**

3 9/20 = write as a decimal number
*April 12, 2012*

**math**

Solve and simplify (3+9i)-(12-5i) 8+6i/7-5i
*April 9, 2012*

**math**

Which X|Y X|Y 1|~1 2|6 Y is 8 less than 8 timesX Y is 8 less than 7 times X Which
*March 6, 2012*

**math**

Solve the system x^2+y^2-4x+2y=20 4x +3y =5
*March 1, 2012*

**Physics**

A circular loop of wire with radius 0.0450 m and resistance 0.154 R is in a region of spatially uniform magnetic. The magnetic field is directed out of the plane. The magnetic field has an initial value of 7.89 T and is decreasing at a rate of -0.630 T/s. What is the rate at ...
*February 29, 2012*

**Chemistry**

It requires 17.9 mL of 0.120 M KOH to titrate 78.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.
*February 27, 2012*

**Chemistry**

Calculate the OH - concentration present in water under the following conditions. Enter your answer in scientific notation. A)[H3O+] = 9.4 x 10-10 M B)[H3O+] = 5.5 x 10-3 M C)[H3O+] = 6.2 x 10-12 M
*February 27, 2012*

**chemistry**

A 11.0% (w/v) solution of ethyl alcohol is diluted from 51.0 mL to 230.0 mL. What is the new weight/volume percent?
*February 21, 2012*

**Chemistry**

Consider the following reaction. 2KClO3(s) ¨ 2KCl(s) + 3O2(g) A)How many grams of KCl are produced from the complete reaction of 10.9 mol of KClO3? B)How many grams of KCl are produced from the complete reaction of 86.2 g of KClO3?
*February 14, 2012*

**math**

how do you calculate the unite price of the two items showing long division
*February 13, 2012*