Saturday

May 28, 2016
Total # Posts: 185

**Physics**

The useful power output of Bryan Allen, who flew a human-powered airplane across the English Channel on June 12th, 1979, was about 350 W. The propellor of the airplane was driven by the pilot's legs, using a bicycle-tyoed mechanism. Using the efficiency for legs (20%), ...
*April 5, 2011*

**physics**

"By means of a rope, whose mass is negligible, two blocks (mass: 11kg and 44 kg) are suspended over a pulley. The pulley can be treated as a uniform solid cylindrical disk. The downward acceleration of the 44 kg block is observed to be exactly one half the acceleration ...
*April 3, 2011*

**physics**

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up the incline and ...
*April 3, 2011*

**Physics**

"A 1220-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Find a) the magnitude of the tension in the cable and b) the magnitude of the horizontal and vertical ...
*April 3, 2011*

**Physics**

"A small 0.5 kg object moves on a frictionless horizontal table in a circular path of radius 1 meter. The angular speed is 6.28 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone ...
*April 3, 2011*

**physics**

"A small 0.5 kg object moves on a frictionless horizontal table in a circular path of radius 1 meter. The angular speed is 6.28 rad/s. The object is attached to a string of negligible mass that passes through a small hole in the table at the center of the circle. Someone...
*April 1, 2011*

**physics**

"A 1220-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A 1960-N crate hangs from the far end of the beam. Find a) the magnitude of the tension in the cable and b) the magnitude of the horizontal and vertical ...
*April 1, 2011*

**physics**

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up the incline and...
*April 1, 2011*

**physics**

"By means of a rope, whose mass is negligible, two blocks (mass: 11kg and 44 kg) are suspended over a pulley. The pulley can be treated as a uniform solid cylindrical disk. The downward acceleration of the 44 kg block is observed to be exactly one half the acceleration ...
*April 1, 2011*

**physics**

Since there are no non-conservative forces involved in this scenario, you can use the principle of the conservation of momentum. Set up the momentum of the baseball player equal to the momentum of the baseball: (75kg)(vB)=(0.145kg)(40m/s). The velocity of the baseball player ...
*March 31, 2011*

**separatio of variables**

solve the initial value problem by separation of variables dy/dx=6x^2y and y(0)=4
*March 19, 2011*

**separation of variables**

solve the initial value problem by separation of variables dy/dx=x2/y given y=-5 when x=3
*March 19, 2011*

**geometry**

What does it mean when the scale factor of the actual object to its model is less than one?
*February 6, 2011*

**diameter**

if the sum of the diameters of two circles is 28 inches one circle has a diameter that is 8 inches longer than the diameter of the other what are the diameters of the two circles
*January 24, 2011*

**math**

Explain why arcsin 3 is undefined.
*January 21, 2011*

**chemistry**

Is this a buffer system? NH3/(NH4)2SO4? It is formed by mixing NH3 (weak base) and a strong acid (H2SO4), but according to my worksheet it is not a buffer system. Why is this so? Isnt it a buffer as long as it consists of a weak base and its salt of a strong acid? Please do ...
*January 13, 2011*

**science**

how does movement differs among Bacteria, grasshoppers, fish, bear
*August 17, 2010*

**chemistry**

1) DETERMINE pH of each of the following 2-component solutions. 0.08M RbOH & 0.130M NaHCO3
*July 18, 2010*

**chemistry**

Suppose a fuel-cell generator was used to produce electricity for a house. If each H2 molecule produces 2e- , how many kilograms of hydrogen would be required to generate the electricity needed for a typical house? Assume the home uses about 850 kWh of electricity per month, ...
*July 11, 2010*

**physics**

carts of a roller coaster are travelling 5m/s over the top of the first hill. If there is no energy loss due to friction and the hill is 50m high,what speed will the carts have at the bottom
*July 1, 2010*

**physics**

carts of a roller coaster are travelling 5m/s over the top of the first hill. If there is no energy loss due to friction and the hill is 50m high,what speed will the carts have at the bottom
*July 1, 2010*

**chemistry**

How much limestone (CaCO3) in kilograms would be required to completely neutralize a lake with a volume of 5.2 x 10^9L . The lake contains 5.0 x 10^-3 moles of H2SO4 per liter?
*June 28, 2010*

**chemistry**

How much limestone (CaCO3) in kilograms would be required to completely neutralize a 5.2 x 109 --L lake containing 5.0 x 10 -3 of H2 SO4 per liter?
*June 28, 2010*

**Math: Is my answer correct?**

it is a
*May 2, 2010*

**math**

what is a mode
*May 2, 2010*

**science**

yes
*May 2, 2010*

**art**

omg
*May 2, 2010*

**CHEM**

41.7 g KBr
*March 22, 2010*

**9th grade**

I need a good thesis statement for a research paper about agriculture as a career.
*February 15, 2010*

**Grammer**

Yes, and the sentence is exactly as written. I'm just supposed to chose. That is why it is confusing.
*November 16, 2009*

**Grammer**

Money might be sewn into a woman's or women's coat linings. Worry haunted the refugee children's or childrens' eyes
*November 16, 2009*

**Grammer**

What is the possessive form of democracy in the following sentence. Would democracy followers win the struggle. Is it democracies'
*November 16, 2009*

**calculus**

find the derivative (1+x)(2+x)....(10+x)
*November 13, 2009*

**math**

Use your Sci Calculator
*October 28, 2009*

**Pre-Algebra**

Can you type the full question to give us the depreciation rate???
*October 27, 2009*

**eng**

Education has helped my life improve as I am now able to understand and form abstract ideas.
*October 27, 2009*

**social studies**

Search for General Robert Lee -
*October 27, 2009*

**Managerial Accounting**

Depending on the business decision. First I would compare income versus outgoing costs verus any surplus - Then I would use that to make my decision to say buy a business item or expand, downsize etc
*October 27, 2009*

**college**

It's a structural alteration of the active site of a protein, rendering it incapable of functioning. Depending on the protein molecule concerned and the circumstances surrounding the denaturation, it can be either temporary or permanent. Common causes of denaturation are ...
*October 27, 2009*

**economics**

A- in the first scenario the 16gb would drop in price. b- In the second the price would remian the same to fool consumers into believing that they are getting a bargain. Typical Business Practise
*October 27, 2009*

**statistics**

2:1
*October 27, 2009*

**college**

25:52
*October 27, 2009*

**spanish**

to correct the indicated fields
*October 26, 2009*

**Pre-Calc (ugent!!!)**

haha is this a last minute calendar problem by any chance? because it's october tomorrow and i have have this problem too! lets hope somebody answers soon...
*September 30, 2009*

**math (challenging)**

If R is the remainder when each of the numbers 1059, 1417, and 2312 is divided by D, where D is an integer greater than 1, compute the value of D-R
*September 30, 2009*

**9th grade geometry**

Y=7
*September 15, 2009*

**algebra**

Think of it as multiplying the fraction by a whole number. One third three times is 1. The order in which you look at multiplication does not matter, the results are the same. 3x(1/3)=1 and (1/3)x3=1
*September 1, 2009*

**chemistry**

in column chromatography in general do polar or nopolar elute first
*September 1, 2009*

**Math/Science**

I'm working on a worksheet, measuring in metric units. The task is to change each measurement to the given unit. For example, 84m 15cm to Centimeters. How do I come up with the answer. Thank You Seth 7th Grade
*August 26, 2009*

**chemistry**

In which one of the following processes is ΔH = ΔE? a. 2HI(g) → H2(g) + I2(g) at atmospheric pressure. b. Two moles of ammonia gas are cooled from 325°C to 300°C at 1.2 atm. c. H2O(l) → H2O(g) at 100°C at atmospheric pressure. d. CaCO3(s) &#...
*August 15, 2009*

**calculus**

n(x)=x^5+xe^x, find the real zeroes using newton-raphson methodology.
*August 2, 2009*

**Math**

you guys suck!
*June 13, 2009*

**physics**

Your hard drive can spin up to 7500 rpm from rest in 5 s. If your hard drive's mass is 40 g and its radius is 2.5 in, what is the force applied to the drive if the force is applied at a point 0.25 in from the center? Assume the drive is a solid, uniform disk with I = (1/2)...
*May 2, 2009*

**physics**

A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 m^3 of water and the surface area of the bottom of the container is 5.00 m^(2 ). The height of the lower part of the container is 2.50m and the neck ...
*April 21, 2009*

**physics**

A student opens a 12.0 kg door If the door is 2.00 m in height and 1.00 m wide what is the moment of inertia of the door about its hinges. The equation for moment of inertia about the hinges is I =1/3 mr^2 should i use the the width or the height as my r i think it should be ...
*April 19, 2009*

**PC Basics**

1-B 2-C 3-A 4-B 5-A 6-B 7-A 8-C 9-C 10-C 11-B 12- 13-D 14-C 15-C 16-A 17-D 18-B 19-C 20-B
*March 24, 2009*

**Estimating rounding(Math)**

88.99 roundes to 90.00 and 9.69 roundes to 100.00 10.00
*March 23, 2009*

**5th grade math**

an someone help me learn an easy way to remember metric conversions?? thanks, Seth
*March 23, 2009*

**physics**

A 9.3 kg firework is launched straight up and at its maximum height 45 m it explodes into three parts. Part A (0.5 kg) moves straight down and lands 0.29 seconds after the explosion. Part B (1 kg) moves horizontally to the right and lands 10 meters from Part A. Part C moves to...
*December 22, 2008*

**physics**

A 9.3 kg firework is launched straight up and at its maximum height 45 m it explodes into three parts. Part A (0.5 kg) moves straight down and lands 0.29 seconds after the explosion. Part B (1 kg) moves horizontally to the right and lands 10 meters from Part A. Part C moves to...
*December 22, 2008*

**physics**

A 9.3 kg firework is launched straight up and at its maximum height 45 m it explodes into three parts. Part A (0.5 kg) moves straight down and lands 0.29 seconds after the explosion. Part B (1 kg) moves horizontally to the right and lands 10 meters from Part A. Part C moves to...
*December 21, 2008*

**MATH**

NORALIE USES 22 GAL OF GAS TO GO 682 MILES. WHAT ARE THE 2 UNIT RATES SHE MIGHT COMPARE & COMPUTE THEM I KNOW ONE IS MILES PER GALLON BUT WHAT IS THE OTHER UNIT RATE? LITERS PER KILOMETER? PLEASE HELP
*November 20, 2008*

**algebra**

(3x^2 - 5x - 6) + (5x^2 +4x + 4) Is says you have to simplify this.. How would you do that? Multiply them together?
*November 19, 2008*

**Pre-Algebra**

-t = -t -6 0=-6 Thats the answer and you put no answer. That's just how some are.
*November 19, 2008*

**algebra**

No it ended up looking wierd when I submited, sorry.Here is the real question (3.2 x 10^5) (2 x 10^-3) -------------------------- (2 x 10^-5)
*November 19, 2008*

**algebra**

(3.2 x 10^5) (2 x 10^-3) ------------------------- (2 x 10^-3) I got 1.6 x 10^5 like this, (3.2 x 10^5) (2 x 10^-3) ------------ x ----------- (2 x 10^-5) (2 x 10^-5) (3.2 x 10^5) (2 x 10^-3) ------------ x (2 x 10^-5) (3.2 x 10^5) ------------ > 3.2 10^5 (2 x 10^10...
*November 19, 2008*

**World History**

What is the ter for the political philosophy followed by Hilter and Mussolini that emphasized importance of the nation or of an ethic group and the supreme authority of the leader over that of the individual?
*April 13, 2008*

**World History**

What was the German form of this type of philosophy that was shaped by Hitler's fanatical ideas about German nationalism and racial superiority known as? The Third Reich
*April 13, 2008*

**world history**

1926
*March 27, 2008*

**world history**

what steps did the major powers take to prtect the peace?
*March 27, 2008*

**social studies**

Why in 1920, did Americans no longer favor the Progressive plateforum
*March 19, 2008*

**American history**

Why in 1920 did American's no longer favor the Progressive platform?
*March 19, 2008*

**world history**

what is the term for the policy of qvoiding conflict that the the United States had originally pursued during the war that was based on the belief that the country should maintain a limited involvement in world affairs while trying to broker a peace?
*February 7, 2008*

**world history**

what is the common name for the clause in the treaty that forced Germany to assume full blame for causing the war?
*February 7, 2008*

**algebra**

what are you support to do.
*February 4, 2008*

**algebra**

compare the slopes and tell whether the lines are parallel. y = x + 2 and y = -x -3 can you tell me how to set up the problem so that I can do it.
*February 4, 2008*

**Math**

12.50
*February 2, 2008*

**world history**

which country wanted to punish Serbia for encouraging terrorism within its borders?
*January 29, 2008*

**substitution method**

-x-4y=-14 2x=y+1 Let's look at your two equations. -x - 4y = -14 2x = y + 1 Let's solve the second equation for y: y = 2x - 1 Now let's substitute (2x - 1) for y in the first equation: -x - 4(2x - 1) = -14 -x - 8x + 4 = -14 -9x + 4 = -14 -9x = -18 x = 2 Substitute ...
*February 20, 2007*

**Geometry**

Find x in terms of y e-zgeometry. com/pow/pictures/25.gif It would be helpful if the verticies had letters at the site you left: http://www.e-zgeometry.com/pow/pictures/25.gif The two smaller triangles are similar to the larger one (the altitude y)
*January 30, 2007*

**pigskin**

i hate it mr.kerr sucks
*October 30, 2006*

**counting**

how many squares are in an 8x8 checkerboard? (the answer is not 64 because thats too low.) Thank you for using the Jiskha Homework Help Forum. Unfortunately, you don't state the size of each square. Hopefully the following will answer your question! Continuing in this way ...
*October 22, 2006*

**math**

One line can divide a plane into two regions. Two lines can divide a plane into four regions. Three lines intersecting at a point can divide a plane into six regions, but you can get more regions than that if the lines don't intersect at a single point. My question for you...
*August 27, 2006*

**Ratios and proportions**

RATIOS AND PROPORTIONS x 3 - = - 4 2 The boards don't post spacing as we would wish. I suppose the problem is x/4 = 3/2. Multiply left and right sides by 4. That will "cancel" the 4 in the denominator of the left side. Now multiply both sides by 2. That will &...
*August 5, 2006*

**Variable**

SOLVING EQUATIONS WITH THE VARIABLE ON BOTH SIDES Solve the equation. Then check your solution. 4x-9 = 7x+12 Just remember that one can add, subtract, multiply, divide, etc but whatever is done to one side must be done to the other side of an equation. 4x - 9 = 7x + 12. Add 9 ...
*August 5, 2006*