# Posts by stephen

Total # Posts: 284

**Physics**

A sphere of radius r =5cm and volume charge density ?=14?C/m^3 spins at ?=200rad/s . What is the magnetic field at the center of the sphere in Tesla?

*March 5, 2017*

**English**

peer pressure destroys character yes or no?.

*January 29, 2017*

**Math**

Students measure the velocity of a car as it races along a track in a clockwise direction. Their measurements are detailed below: Time (sec) | Velocity (in/sec) 0 | 4 1 | 8 2 | 10 3 | 6 4 | 9 5 | 12 6 | 5 7 | 8 8 | 10 9 | 6 10 | 12 Estimate the distance traveled by the car ...

*January 22, 2017*

**math**

The roof of a tunnel is in the shape of a parabolic arch whose highest point is 18m above the road. The road surface is 16m wide. Lights are placed in the tunnel 12 meters high. How far from center of the tunnel are the lights placed?

*January 19, 2017*

**Calculus**

Oh lol, I think I see what we're doing differently. I thought that the first instance that the particle would be at the origin was when t=0 but it really is when t=pi/2. Basically, I substituted the wrong number. Thank you, and I'm sorry for not seeing your point.

*December 27, 2016*

**Calculus**

I believe your equation for velocity is incorrect. In this case V=-sin(sqrt(t))*1/2(sqrt(t))^-1/2 Your equation for velocity is missing raising to the -1/2 power at the end. applying that piece will make velocity undefined at t=0.

*December 27, 2016*

**Calculus**

The Question: A particle moves along the X-axis so that at time t > or equal to 0 its position is given by x(t) = cos(?t). What is the velocity of the particle at the first instance the particle is at the origin? So far I was able to determine that the velocity of the ...

*December 27, 2016*

**AP Calculus AB**

The fence around Wayne Manor (a rectangular plot of land) is going to be replaced. No fence will be required for the side lying along Gotham river. If the new wrought iron fence costs $12 per meter for the side parallel to the river and $4 per meter for the other two sides, ...

*December 11, 2016*

**science**

How many drop (1drop=0.05ml) of 0.20M potassium iodide must we add to 0.010M Pb(NO3)2 to get precipitation of lead iodide to start if Ksp of lead iodide is 7.1x10^-9.

*November 28, 2016*

**Riddle**

Long_short,round_square,good_broken,painted_plaine. What are they.

*November 26, 2016*

**math**

if the three sides of an equilateral triangle are 3x + 2, 2y - X and y + 3. find X and y and the perimeter of the triangle. kindly elucidate further on this question

*November 22, 2016*

**PHYSICS**

Pls help me find the answer

*November 14, 2016*

**chemistry**

when a quantity of powdered sulphur is burnt in excess oxygen, 100cm3 of SO2 were produced at STP CAL,the vol of gas at STD

*November 11, 2016*

**math**

subtract 3x-12/4x^2-8*2x^2-4/9x-36

*September 30, 2016*

**Physics**

I'm having Sig fig troubles. What would 0.98*2040 be using Sig fig rules???

*September 13, 2016*

**Calculus integrals**

LOL are you doing Besner's webwork too?

*September 7, 2016*

**math**

if V(r)=4/3 pir^(3) find (v2r)/(vr)

*September 5, 2016*

**Statistics**

If the the girls are not being replaced (i.e put back in the lot) it would be (16/54)+(15/53)+(14/52)+(13/51) since you're not replacing them, the amount of people inside the group decreases. Now fi the candidates were being replaced, the amount of candidates in total ...

*September 4, 2016*

**algebra**

y=7x

*September 4, 2016*

**stat**

1|3366 2|12334445555666789 3|022223344489 4|237 5|2 The first quartile, if your plot was to be divided equally into 4 quarters, would be from the first point around the 9th point. So for example, if you're staring from the top, you'd add up the points from 1.3-2.4 (The...

*September 4, 2016*

**Math**

(1/2)17+(1/6)= Since a coin has 2 sides, the probability of landing a heads is 1/2, and because there are 17 of them, you multiply the 1/2 by 17. The die is being rolled once so the porbability of rolling a 4 is 1/6. Add them together you get what you need.

*September 4, 2016*

**Math**

Let K(x)= (sin(3x-7)) / (e^x-2) (I'm sorry if it is not clear here, but the denominator in K(x) has the natural number, e, to the power of just x. So "x-2" is not the exponent. "x" is the exponent). The Question: Does K(x) have a horizontal asymptote? (...

*September 4, 2016*

**English**

Alright, I understand. Thank you!

*August 24, 2016*

**English**

Is the word "and" still considered a coordinating conjunction if it is being used in a list rather than to connect two independent clauses? For example: "Jeff wants to buy an apple, a pear, and a banana" Is the "and" used in that sentence still a ...

*August 24, 2016*

**math**

(1/2)x+(3/4)x=(4/3)x+2 solve for x (5/4)x=(4/3)x+2 -(1/12)x=2 x= 2 * -12 x=-24 the number is -24

*August 21, 2016*

**English**

Alright, thanks!

*August 21, 2016*

**English**

Just out of curiosity, is it okay to use the phrase "and so" in a sentence? Like "Johnathan knew that he had to help the boy asking a question on Jiskha. And so, he did just that, and the boy went on to being the happiest boy on earth." I just need to know ...

*August 21, 2016*

**Math**

What I ended up getting was v(t)=3 sin( pi/3 (t- ((4-pi/2)))) -1 so B= pi/3 and C=4–pi/2

*August 20, 2016*

**Math**

Context: The function v(t) represents the velocity of a particle moving along a horizontal line at any time, t, greater than or equal to zero. If the velocity is positive, the particle moves to the right. If the velocity is negative, the particle is moving to the left. The ...

*August 20, 2016*

**eng 122**

Yes, this is a component of writing with an academic voice.

*August 20, 2016*

**AP Chem help?!!!!**

What effect will dissolving larger amounts of salt in a beaker of water have on the concentration and conductivity of the solution? 1. The concentration does not change, but the conductivity increases. 2. Both concentration and conductivity decrease. 3. Both concentration and ...

*August 18, 2016*

**AP Chemistry help!!!!!**

How does the boiling point of ethane (CH3CH3) compare with that of ethanol (CH3CH2OH)? 1. The boiling point of ethane is higher because it has stronger London dispersion forces. 2. The boiling point of ethane is higher because it has stronger dipole-dipole forces. 3. The ...

*August 18, 2016*

**Math**

Thank you.

*August 17, 2016*

**Math**

A hiker started to climb up the hill at 6:00 am and either kept climbing up or rested at some place(s). He reached the top at 6:00 pm. he rested there for the next 12 hours. Next day at 6:00 am, he began to travel down the same path. He either moved downward or rested at some ...

*August 17, 2016*

**Math**

Reiny I believe you have made a mistake, but using the same method, the correct answer would be 1mile (because (1/60)*(60)). But still, thanks for the help.

*August 15, 2016*

**Math**

Thank you for your response, but to clarify, why is "(17+13)" important in the problem?

*August 15, 2016*

**Math**

The question goes as follows: Two trains are moving toward each other at speeds 17 mph and 43 mph. How far apart are they 1 minute before they pass each other? So I have been trying to answer this question for a while now, and it is turning out to be a little harder than I ...

*August 15, 2016*

**chemistry**

what will be formed when oxygen combines with hydrogen in the presence of hydrated iron 3 oxide?

*July 17, 2016*

**CHEMISTRY**

USING DOT (.) AND CROSS (x) DIAGRAM SHOW THE BONDING IN THE COMPOUND FORMED WHEN HYDROGEN AND OXYGEN COMBINE

*July 3, 2016*

**Geometry**

Point $G$ is the midpoint of median $\overline{XM}$ of $\triangle XYZ$. Point $H$ is the midpoint of $\overline{XY}$, and point $T$ is the intersection of $\overline{HM}$ and $\overline{YG}$. Find the area of $\triangle MTG$ if $[XYZ] =150$.

*April 21, 2016*

**Math- PLEASE HELP**

Altitudes $\overline{XD}$ and $\overline{YE}$ of acute triangle $\triangle XYZ$ intersect at point $H$. If the altitudes intersect at a $123^\circ$ angle, and $\angle YXH = 26^\circ$, then what is $\angle HZX$ in degrees?

*April 21, 2016*

**life orientation**

They become uncertain hopeless,careles and even lonely becouse of the pressure

*March 31, 2016*

**math**

For the Rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. For an 10 month period, the last term is and the series sum is . For a 15 month period, the last term is and the series sum is . For a 20 month period, the last term is ...

*March 15, 2016*

**physics**

a ball of mass 0.1kg is thrown vertically upwards with an initial velocity of 80m/s.calculate the potential energy (I) half way up (ii) at its maximum height.what is the kinetic energy as it leaves the ground

*March 13, 2016*

**mathematics**

A mortgage is taken out of 100000 dollars and is repaid by annual instalments of 20000 dollars. Interest is charged on the outstanding debt at 10 percent annually. If the first repayment is made one year after the mortgage is taken out, find the number of years it takes for ...

*January 28, 2016*

**Social Studies**

Why did the Spanish and French start fighting? Question from Social Studies weekly week 8 for 4th graders.

*October 25, 2015*

**Health. Please check answers**

B, B, B. 100%

*October 7, 2015*

**programming in basic**

1 If four statements are entered with the same statement number, the computer will accept the ______ statement with the duplicate statement number first second third fourth 2 ______ is a valid BASIC number? 567890100 200,000 $65 1.05E+09 3 Data provided using the ______ ...

*October 6, 2015*

**chemistry**

2.A 3.A 4.C 5. 6. B 7.B 8.B 9. 10. D

*September 16, 2015*

**Maths**

Change these fractions to twentieths and then arrange them in order of size, smallest first. 7/20 2/5 3/4 7/10

*September 8, 2015*

**Algebra**

Simplify. -x^3(1-x^2)^-1/2 -2x(1-x^2)^1/2 ------------------------------- x Do I first start by getting rid of the negative exponents? I do not know where to begin. Please help.

*August 21, 2015*

**Algebra**

Factor by removing the common factor with the lesser exponent 2x(x-5)^-3 -4x^2(x-5)^-4 I don't really know how to do this. The final answer I got is: 2x(2x^2-10x+1) -------------- (x-5)^4

*August 21, 2015*

**help**

The a is supposed to be a square root

*August 21, 2015*

**Algebra**

t^2/ã(t^2+1) - ã(t^2+1) ------------------------- t^2 Is the final answer -1/t^2 sqrt(t^2+1)

*August 21, 2015*

**Algebra**

I'm just trying to write it like it appears in the book. (5)^-1/2 * (5x)^5/2 (5x)^-3/2 Simplifies to 1/5 * ã5x^5(1/ã5x^3) How do I get to xã5? I'm confused. I've tried many times.

*August 21, 2015*

**Algebra**

Simplify 5^-1/2 * 5x^5/2 (5x)^-3/2 My final answer was x/sqrt5

*August 21, 2015*

**Algebra**

Solve the complex fraction ((t^2/sqrt t^2+1)-sqrt t^2+1))/t^2 Is the LCD to multiply by sqrt t^2+1????? Please help!

*August 21, 2015*

**Still need help**

Is the final answer x/sqrt5?

*August 20, 2015*

**Algebra**

after more simplification I got x^2(sqrt5x)/(sqrt5)(x sqrt5x) can I cancel out the sqrt5x from the denominator and numerator?

*August 20, 2015*

**Algebra**

5^-1/2 x 5x^5/2(5x)^-3/2= 1/sqrt5 x sqrt5x^5 x 1/sqrt5x^3= ??? I need to simplify and I need help understanding what the next step is

*August 20, 2015*

**Algebra**

Rationalize numerator. ((sqrt7)-3/4)(sqrt7+3/sqrt7+3) I got that the answer is 7-9/4sqrt7+12= -2/4sqrt7+12

*August 20, 2015*

**physics**

3125/16

*August 3, 2015*

**History**

The 4th amendment says that probable cause must be established for a domestic search warrant.

*July 23, 2015*

**History**

The best answer is A the 6th amendment.

*July 23, 2015*

**Finance**

BH Holding Inc. is considering undertaking a capital project, costing $8 million today. in addition, the project will be installed over the next 2 years, costing $1.0 million at the end of the first year and $0.5 million at the end of the second year. thereafter, the project ...

*June 11, 2015*

**HELP PLEASE NOW**

Ummmmm @ Anonymous how are you going to make a phone call home when you don't even have are phone numbers? Huh? Thought so, and you don't know any of us. So uh, your wrong.

*May 29, 2015*

**math**

-5x^2 + 3x^2 = -2x^2 5x - 4x = x 5 -2 = 3 -2x^2+x+3

*May 28, 2015*

**Math**

The numbers that your showing are in increments of 50 and would be shown on your graph as such. If your looking for further breakdown the increments in between would be in 25 units. 50-75-100-125-150-175-200-250-300

*May 28, 2015*

**Maths**

thanks

*April 27, 2015*

**Maths**

i don't have the answer for b

*April 27, 2015*

**Maths**

A football match between United and City is watched by 24 000 spectators. Of the 24 000 spectators, 14 112 support United and 8208 support City. The rest of the spectators are neutrals who support neither team. a.Work out the percentage of the 24 000 spectators who support ...

*April 27, 2015*

**Maths**

thanks i have now done the last 2

*April 27, 2015*

**Maths**

please help i can't do them

*April 27, 2015*

**Maths**

what about the other 2

*April 27, 2015*

**Maths**

22.5%

*April 27, 2015*

**Maths**

In a sale of electrical equipment, the price of all goods is reduced by . Work out the sale price of the following. a A DVD player which normally costs £88 b A portable audio player which normally costs £150 c A laptop computer which normally costs £986

*April 27, 2015*

**Maths**

thanks so the answer is 3.75%

*April 27, 2015*

**Maths**

yes

*April 27, 2015*

**Maths**

Ranee keeps £360 in a savings account for a year. At the end of the year she gets £13.50 in interest.Work out the interest rate on the account.Give your answer as a percentage. What's the answer guys and girls

*April 27, 2015*

**PHYSICS**

1.522j

*April 8, 2015*

**Chemistry**

how many molecules of N2 could fit in a 2.00L soda bottle at 23C and 755mmHg

*March 30, 2015*

**phy**

505k

*March 26, 2015*

**ss**

In what ways can it be argued that the European union caused ww1 and ww2

*March 17, 2015*

**art**

what perspectives are important in understanding a work of art?

*March 2, 2015*

**Entrepeurnuership**

I think its 1

*February 24, 2015*

**please answer**

please answer

*February 24, 2015*

**Entrepeurnuership**

anybody can answer

*February 24, 2015*

**Entrepeurnuership**

which of the following companies is the easiest type to set up sole proprietorship LLC C corporation S corporation

*February 24, 2015*

**entrepreneurship**

I have another

*February 24, 2015*

**entrepreneurship**

thanks

*February 24, 2015*

**entrepreneurship**

differenite

*February 24, 2015*

**entrepreneurship**

please

*February 24, 2015*

**entrepreneurship**

can you just tell me

*February 24, 2015*

**entrepreneurship**

organize itself

*February 24, 2015*

**entrepreneurship**

A trade mark can help your company do what Organize itself differentiate it self buy and sell itself track inventory

*February 24, 2015*

**physics**

Wayne has a little dick. #RT

*January 17, 2015*

**Algebra please help**

Can you help with part 1 of the problem?

*January 7, 2015*

**Algebra please help**

Pain says she should get $3 discount on the price of each shirt and a $3 discount on the price of each pair of jeans. Part 1 Write and simplify an expression to find the amount she would pay if this is true. Part 2 why are the amounts Pani pays in a and b different? Part 3 if ...

*January 7, 2015*