Thursday

December 8, 2016
Total # Posts: 978

**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*

**Steve **

6 + 10 = 16 ***

*June 10, 2013*

**Steve **

where does 6 + 10 = 18 come from ?

*June 10, 2013*

**Math - Decimals**

0.052

*June 5, 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*

**chemistry**

What is the temperature of a 1.02 mol gas sample that occupies 17.3 L at 753 torr?

*May 21, 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*

**English**

so what is the correct answer for question 1?

*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*

**math**

Bleh

*April 14, 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*

**Astronomy - Physics**

18 720

*March 9, 2013*

**math**

order numbers least to greatest3/2,-1.2,0.8,_1/3

*March 8, 2013*

**analytical chemistry**

goteem

*March 3, 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*

**Algebra**

corect

*February 18, 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*

**Medical Sociology**

I was thinking people who live in inner cities are unable to get transportation or are unable to afford care even with insurance

*December 12, 2012*

**Medical Sociology**

Obamacare will enable 32 million more Americans to have health insurance. Despite this coverage, medical sociologists know that there are other barriers besides health insurance that make it difficult for patients to seek medical care. Describe 3 such barriers to seeking care...

*December 12, 2012*

**math**

f(x)=165*x what is the domain plz i need help

*December 5, 2012*

**sat essay**

We'll no a speech can't just change some one so I think not

*November 30, 2012*

**science **

speed=frequencyxwavelengthc=f please explain

*November 29, 2012*

**math**

what number is 33% of 500?

*November 27, 2012*

**math**

the reciprocal of the expression 2/x + 3/1

*November 23, 2012*

**math**

the reciprocal of the expression 2/x + 3/1

*November 23, 2012*

**Math**

578 of 850 employees work directly with guests what percentage of employees work directly with guests

*November 19, 2012*

**social studies**

What physical feature in Africa is located in the northeast and seperates it from Asia?

*November 13, 2012*

**Math (Algebra 1)**

24.333

*November 8, 2012*

**Math**

Central Middle School sold 50 tickets for one night of the school play. Student tickets sold for $2 each and adult tickets sold for $3 each. They took in $135. How many of each type of ticket did they sell?

*November 7, 2012*

**Physic**

A 10 kg particle moving along the x-axis experiences the force shown in figure. The particle goes from v=1.0m/s at x=0 and v=5.0 m/s at x=2. What is the f max?

*October 30, 2012*

**physics**

23 32 23 19

*October 23, 2012*

**science**

Thank you Ms.Sue you a super duper smart and you are the best! :) :D

*October 22, 2012*

**science**

Any websties that say if a snowflake is a crystal? |

*October 22, 2012*

**science**

Is a snowflake a crystal? Can you show me a website were i can read about what a crystal is?

*October 22, 2012*

**science**

Is a mineral a crystal?

*October 22, 2012*

**voltage drop**

12v r1=10 r2=15 r3=2 r3=18 how would one solve this

*October 22, 2012*

**CALC 251**

Suppose that f(x)= (e^x)/(x^2+16. Find f'(0).

*October 22, 2012*

**CALC 251**

Let f(x)= [5x^(1/4)]*(x^3-8) Evaluate at f'(x).

*October 22, 2012*

**math**

A water trough is 4 m long and its cross-section is an isosceles trapezoid which is 210 cm wide at the bottom and 280 cm wide at the top, and the height is 70 cm. The trough is not full. Give an expression for V, the volume of water in the trough in cm^3, when the depth of the...

*October 15, 2012*

**Calculus 251**

The slope of the tangent line to the curve y= 3x^3 at the point (-1,-3) is:? The equation of this tangent line can be written in the form y=mx+b where m is:? and where b is:?

*October 15, 2012*

**ENGLISH**

You can't expect people to do your homework for you. The whole idea is to help each other. I can check your answers but that's hard to do when you don't post any....

*October 14, 2012*

**finance**

You have been given the following information on a project: It has a 3-year lifetime The initial investment in the project will be $28 million, and the investment will be depreciated straight line, down to a salvage value of $6 million at the end of the fourth year. The ...

*October 13, 2012*

**Physics**

A truck is stopped at a stoplight. When the light turns green, the truck accelerates at 2.0 m/s2. At the same instant, a car passes the truck going 13 m/s. Where and when does the truck catch up with the car? _________m (from the intersection)

*October 7, 2012*

**math**

plz help

*October 3, 2012*

**Elena plz help**

help me plz

*October 3, 2012*

**math**

4. Point E is located at (–2, 2) and point F is located at (4, –6). What is the distance between points E and F? a. square root of 52 b. square root of 28 c. 10 d. square root of 20 5. In which quadrant is the point (x, y) located if x is negative and y is positive? ...

*October 3, 2012*

**math**

c d a

*October 3, 2012*

**Finance**

9.4 PERCENT

*October 2, 2012*

**algebra**

From a point on a straight road. Pablo and Kelsey ride bicycles in the same direction. Pablo rides 12mph and Kelsey ride 14mph. How many hours will they be 9 miles apart

*September 18, 2012*