Thursday
July 2, 2015

Posts by j


Total # Posts: 784

physics/calc
An anchor weighing 110 lb in water is attached to a chain weighing 2 lb/ft in water. Find the work done to haul the anchor and chain to the surface of the water from a depth of 35 ft.
March 21, 2014

math
if someone walks 5km in 21 minutes and then 4 km in 39 minutes then whats his average speed
March 12, 2014

economics
I think that the answer is 2*sqrt(1000)
March 12, 2014

Physics
Find Us=1/2k(deltax)^2 =1/2(180)(.15)^2 =2.025 This is spring potential energy. This must have been conserved from kinetic energy. Therefore Us=K=1/2mv^2 2.025=1/2(.195+.005)(v^2) v=4.5 m/s This is explains the time that the bullet is imbedded in the wood. To find the speed of...
March 11, 2014

Chemistry
How does Le Chatelier's principle explain the result you obtained when you add HCL to a suspension of Ca(OH)2 in water? Where the result was, precipitate dissappeared and an increase in temperature resulted.
February 24, 2014

chemistry
What is the molality of a solution composed of 28.4 g of methanol CH3OH and 250 g of water
February 18, 2014

trig
Given csc theta= 4, cot theta < 0 Find the exact values of cos theta and tan theta
February 11, 2014

History
Europeans were drawn in to sub-Saharan Africa in their quest for? a. gold and diamonds. b. diamonds and slaves. c. gold and slaves. d. slaves only. I can't find the correct answer. Please help! I believed it was gold and slave but it is not an option.... or is it c?? what ...
December 14, 2013

History
All are countries that were prominently Catholic in the 1500's and remain so today except? Spain France Italy Netherlands --- From my research, I see that Spain and Italy's main religion is Catholic. So I assume those two are not it. But I am confused on France and ...
December 13, 2013

trig
Juana and Diego Gonzales, ages six and four respectively, own a strong and stubborn puppy named Corporal. It is so hard to take Corporal for a walk that they devise a scheme to use two leashes. If Juana pulls with a force of 23 lbs at an angle of 18° and Diego ...
December 12, 2013

English
It is very general question. I am supposed to write 2,000 words analytical essay but my teacher told me based on my topic I need to write it in journal entry with only intro being 200 words. When I hear "journal entry", it is not the same as an essay. Do you think ...
December 9, 2013

English
I have hard time understanding this wordings :( Turner thesis* by about a hundred years: the myth of the American west did more than anything else to shape the American character. Civilization by its very nature takes away our freedom, but as Americans we can always find ...
December 3, 2013

Geometry
The diagonal of a rectangle are 24 inches long intersect at an angle of 60°.Find the perimeter of the rectangle.Pls help me.
December 2, 2013

Geometry
The diagonal of a rectangle are 24 inches long intersect at an angle of 60°.Find the perimeter of the rectangle.Pls help me.
December 2, 2013

Geometry
The diagonal of a rectangle are 24 inches long intersect at an angle of 60°.Find the perimeter of the rectangle.Pls help me.
December 2, 2013

Geometry
The diagonal of a rectangle are 24 inches long intersect at an angle of 60°.Find the perimeter of the rectangle.Pls help me.
December 2, 2013

Geometry
The diagonal of a rectangle are 24 inches long intersect at an angle of 60°.Find the perimeter of the rectangle.Pls help me.
December 2, 2013

Statistics 1
10
December 1, 2013

Bio
A______ is a tentative, testable explanation for an observed phenomenon. I am confused with hypothesis and theory. But my guess is hypothesis. is this true? or am I wrong?? thanks
November 28, 2013

Bio
What type of polysaccharide is the main source of fiber in our diet? My guess was cellulose. Is this correct?
November 28, 2013

Math
There were 7 times as many marbles in Box A as in Box B. After Joyce transferred 294 marbles from Box A to Box B, both boxes had the same number of marbles. How man marbles were there in Box A at first.
November 20, 2013

Statistics
57.14%
October 28, 2013

science
no
October 23, 2013

math
suppose 3 students change their vote from math to science .describe how the frequency table would change
October 9, 2013

Math
Its a big gigantic X . Thats the diagram. Its a vertical angle
September 29, 2013

Math
So im told to find the value of each variable. It's a X. One side equals 3xº and the other side says (80-x)º 3x=80-x 4x=80 x=20 As you can see the value I got was 20. But in another question it tells me to find the measure of the labeled angles. How do I do that?
September 29, 2013

Algebra HELP!!
Find the measure of each angle. Angle A is half as large as its complement angle B
September 29, 2013

math
2x-6/3=-2
September 24, 2013

Physics
36 seconds
September 22, 2013

Chemistry
A solution is made by mixing 90.6 g of magnesium sulfate heptahydrate with 2320.0 g of water. 690.00 mL of the solution has a mass of 745.20 g. 1. What is the molarity of the magnesium sulfate solution? 2. What is the molarity of the magnesium ion? 3. What is the molality of ...
September 11, 2013

Math
A second hand Furniture store buys sofas with a list price of 9,500. IF the wholesaler offers trade discounts of 10/20/30, find the single equivalent discount.
August 31, 2013

math
In the standard (x,y) coordinate plane, the graph of (x + 3)2 + (y + 5)2 = 16 is a circle. What is the circumference of the circle, expressed in coordinate units?
August 14, 2013

Math- Urgent
Thank You so much the link was helpful and I found my answer :-)
August 13, 2013

Math- Urgent
What are the angle relationships formed when a third line intersects two parallel lines?
August 13, 2013

Math- Urgent
Yay!! Thank you so much Mrs. Sue you really helped me!
August 12, 2013

Math- Urgent
Oh. That makes more sense. Thank you. I have four more problems so I will work one more out so you could check it. -11=v/2-6 Add 6 to each side -11+6=v/2-6+6 -5=v/2 -5x2=v v=-10 Is this correct Mrs. Sue?
August 12, 2013

Math- Urgent
Okay. 3=r/16+4 My teacher told me to cross multiply so: 16x4=64 Then I get lost because I don't know the next step except to subtract three from both sides which gives you r/16=43.
August 12, 2013

Math- Urgent
Solving Equations 3=r/16+4 What does r equal? Please show all work.
August 12, 2013

Math- Urgent
Thank You
August 12, 2013

Math- Urgent
Solving Equations -7+b/15=-6 What does b equal? Please show all work.
August 12, 2013

Physics
Charge A has a charge of +2C. Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of Charge B and has a charge of -1C. If a fourth charge (Charge D) is placed 4 meters to the right of Charge B, how much charge must it...
August 8, 2013

Calculus
A fence 5 feet tall runs parallel to a tall building at a distance of 2 feet from the building. We want to find the the length of the shortest ladder that will reach from the ground over the fence to the wall of the building. Here are some hints for finding a solution: Use the...
July 17, 2013

Calculus
Find the positive value of x which satisfies x = 4.3cos(x). Give the answer to six places of accuracy. Remember to calculate the trig functions in radian mode
July 17, 2013

Calculus
the first two are wrong
July 17, 2013

Calculus
The equation 10(x-1)(x-2)(x-3) = 1 has three real solutions a<b<c where a = , b = , and c = . Enter your answers with at least six correct digits beyond the decimal point. Hint: Ask what the solutions are if the right hand side is 0 instead of 1, and use Newton's ...
July 17, 2013

MATH
A data set has the following points: (0, 2), (4, 1), (6, 0) The slope of the linear regression line is -0.32. Find the y-intercept of the linear regression.
July 11, 2013

Physics
anyone for 8
June 15, 2013

physics
Three objects of same heat capacity with temperature T1=200 K, T2=400 K and T3=400 K exchange heat with each other. They are isolated from the rest of the universe. Find the highest possible temperature one of them can reach in kelvin.
June 4, 2013

math
june5
May 24, 2013

language
the - definition of glommy is dismal or depressing is it denotative
May 24, 2013

pyhsic question for count iblis
iblis got the problem right. for those trying to use jiskha to cheat on the brilliant problems, there was a mistake made in the acceptable answers for this week's question.
May 22, 2013

Physics
how did you get 1.68?
May 20, 2013

physics
A car with a mass of 1000kg is travelling at a constant velocity. The force from the engine is 200Newtons. Calculate the acceleration of the car using the formula f=ma. How long will it take this car to travel 0-60 mph (n.b. 1mph = 0.45m/s)
May 16, 2013

Physics
formula for Q#8 part 1 or answer for α=84∘?
May 11, 2013

math
find the missing side of the triangle b=2.1 c=29
May 6, 2013

Physics
A massless spring, with K=425 N/m, is hung vertically with the bottom end of the spring at position Y.i. A 3.50 kg mass is attached to the bottom of the spring and allowed to fall and oscillate. A) How far below Y.i does the mass fall before coming momentarily to rest and ...
May 1, 2013

Physics
The planet Tralfamador is a planet of mass M and radius R, and very thin atmosphere (neglect air resistance). A magnetic rail gun has been mounted on the surface of Tralfamador at the North pole. A projectile of mass m is fired from the magnetic rail of gun with an unknown ...
May 1, 2013

Physics
Some communication satellites are put into a circular geosynchronous orbit in which the satellite remains above a certain position on the earth's equator as it orbits. Such a satellite would always be in the same position in the sky as seen from the transmitting or ...
May 1, 2013

math
4 o'clock am on Tuesday
April 30, 2013

math
there is a 20% chance that it will snow on tuesday and a 50% chance that it will snow on Wednesday. what is the probabilty that it will snow on either day?
April 28, 2013

chemistry
if the amount of radioactive iodine-123 in a sample decreases from .400g to .100g in 26.2 hours, what is the half-life of iodine-123
April 18, 2013

chemistry
You can look them up in a chart. Try going to engineeringtoolbox website. They have a very useful chart of the specific heat of metals
April 16, 2013

chemistry
Delta (triangle) E is the change in internal energy. E(final)-E(initial) 25-12= 13 = E(final) 13-25= -12kj= Delta (triangle)E
April 16, 2013

Quantum Physics
C'mon @cheers!! get some rest :) 5A is not (0,-1), or (0,1/sqrt(K)) or (0,-1/sqrt(N)) xD It must be something very close to it... I think the answer is translating the grover algorithm to a Bloch Sphere and see how it moves around the surface :) At least, that is what 5B,c...
April 16, 2013

Quantum Physics
wow! Strange behaviour @cheers xD Nevertheless good news for 5C :D Now, only 5A remains behind the Fortress of Solitude...
April 16, 2013

Quantum Physics
5A is not -1/sqrt(N) or any combinations with minus sign.
April 16, 2013

Quantum Physics
Ok, 5C is 1/sqrt(K) for both of them. I cannot figure out what is 5A... :(
April 16, 2013

Quantum Physics
Hi PhysTech, I am reading an article from twistedoakstudios(at)com in /blog/Post2644_grovers-quantum-search-algorithm and doing some calculations... Seems cyclic, in a geometric view.
April 16, 2013

Quantum Physics
Hi! I have just done 5B: ay=-1, ax=0, so, cheers and PhysTech, it must something about a cycle of the states from m-2, m-1, m, m+1, m+2
April 16, 2013

algebra.. PLEASE help me!!
jj
April 11, 2013

physics
A plastic rod has been bent into a circle of radius R = 8.80 cm. It has a charge Q1 = +4.60 pC uniformly distributed along one-quarter of its circumference and a charge Q2 = -6Q1 uniformly distributed along the rest of the circumference. Take V = 0 at infinity. (a) What is the...
April 4, 2013

NOVACC
A circular loop of wire (radius = 6.0 cm, resistance = 40 miliamps) is placed in a uniform magnetic field that makes and angle of 30 degrees with the plane of the loop. The magnitude of the field changes with time according to B = 30 sin (20t)mT, where t is measured in s. ...
April 1, 2013

Quantum Physics
display.cgi?id=1366086762
March 28, 2013

math
a cube with 2 in sides is placed on a cube with 3 in sides. then a cube with 1 in sides is placed on the 2 in cube. what is the surface area of the three cube tower?
March 21, 2013

Chemistry
A coffee cup calorimeter contains 25.0 grams water at 23.8 C A 5.00g sample of an unknown metal at an initial temperature of 78.3 C was dropped into the calorimeter. The final temperature of mixture was 46.3 C. Calculate the specific heat of the metal. The specific heat of ...
March 19, 2013

Organic 1
what orbital overlaps in butene
March 11, 2013

geometry
7 points are placed in a regular hexagon with side length 20. Let m denote the distance between the two closest points. What is the maximum possible value of m?
March 11, 2013

MATH VERY URRRGENT!!!!!!!!!!!!!
b
March 9, 2013

math
order numbers least to greatest3/2,-1.2,0.8,_1/3
March 8, 2013

Chemistry
Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) <-> PCl3(g)+Cl2(g) Kc=1.80 at 250 degrees Celsius A 0.222 mol sample of PCl5(g) is injected into an empty 3.25 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and...
March 3, 2013

calc 2
(a) LEFT For left hand or right hand rule, every extra digit requires 10 times of work. 4 digit needs 2 second. From 4 to 12, it has 8 digits. 2 * 10^(8) seconds / 60 /60 /24 /365 = 6.3 years (b) MID For midpoint rule, every 2 digit requires 10 times of work. 2 * 10^(8/2) /60...
February 25, 2013

math
a sprinter runs the first 50 meters in 5 seconds. What will be the velocity at the end of the 5 seconds?
February 24, 2013

physics
A wooden crate weighs 780 lb. What force is needed to start the crate sliding on a wooden floor when the coefficient of starting friction is 0.40?
February 22, 2013

Math?
Place twelve $1 bill and twelve $10 bill on the template. Than exchange bills so that the same amount of money is on the template using the fewest number of bills. Write the result in expanded form
February 20, 2013

Math?
How much money is one $100 bill plus $10 bills plus fifteen $1 bill?
February 20, 2013

Math
Place twelve $10 bill on the place value template then exchange ten of the bill for one $100 bill and write the result in expanded form
February 20, 2013

Math math
Write the number for 3 hundred plus 5 teens
February 20, 2013

Math
Write the number for 5 hundred pluse 7 tens pulse 8 ones
February 20, 2013

Math
How much money is one $100 bill pluse ten $10 bills pluse fifteen $1 bills?
February 20, 2013

Math
Which digit in 365 shows the number of tens
February 20, 2013

Math
Place twelve $1 bill and $10 bill on the template. Than exchange bills so that the same amount of money is on the template using the fewest number of bills. Write the result in expanded form
February 20, 2013

Math
Place twelve $10 bill on the place value template. Then exchange ten of the bill for one $100 bill and write the result in expanded form
February 20, 2013

Math
Write the number for 3 hundred pluse 5 tens
February 20, 2013

Math
A 7 4/5 ounce can of cat food costs 38 cents. What is the unit rate (price per ounce) of the cat food?
February 11, 2013

Math page 167 algebra did you hear about...
How do you start it then I can solve it easily. I'm not cheating.!!!!!
February 5, 2013

Math page 167 algebra did you hear about...
Hi I need help with this one problem. It's on page 167 algebra with pizzazz. It has to use the addition method. 3x-5y=7 5x-2y=-1
February 5, 2013

orgo
A sample of naphthalene, which should be pure white, was found to have a grayish color after the usual purification procedure. The melting point was correct, and the melting point range was small. Explain the gray color.
January 30, 2013

physical science
about 8.2
January 9, 2013

history
in the later pharses of the civil war general running for president
December 16, 2012

Medical Sociology
i was also thinking communication and finances (even with insurance it can be difficult to pay for health care)
December 12, 2012

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