Thursday

July 31, 2014

July 31, 2014

Total # Posts: 833

**Physics**

i mean.. mr^2w+Iw = mr^2w+Iw ... which is equivalent to L+L = L+L

**Physics**

I don't really understand we use I1w1=I2w2? but according to your equation its mr^2+Iw = mr^2+Iw ... which is equivalent to I+L = I+L <-- i dont get this part? and the answer is 0.568 rev/s which according to your way is right but its 19 instead of 29.

**Physics**

A turntable of radius 2m rotates freely about a fixed vertical axis. A child 19 kg is standing on the turntable right at the outer edge and the system is initially rotating at an angular speed of 0.5 rev/s. The child then moves to position 1m from center of the turntable. what...

**algebra**

At a local ice cream shop, you can choose from a collection of 18 different toppings. If you want to choose at least one topping, how many different topping combinations are possible (assuming no repeat toppings)?

**statistics**

Sweden is reported to have among the highest percentage of citizens aged 80 years and over, at approximately 5.5 % (i.e. 5.5 % of it's population falls within this age category). Suppose 20 individuals are randomly selected from the population, and X is the number of indiv...

**math**

From an exteror point P that is h units form a circle of radius r, a tangent line is drawn to the circle. Let d denote the distance from the point P to the point of tangency T. Express d as a function of h.(HINT: if C is the center of the circle, the PT is perpendicular to CT)

**biology**

Explain the importance of carbon's ability to form covalent bonds in straight chains, branched chains, or rings.

**chemistry**

What mass of H2SO4 would be required to react with 0.59 mol of NaOH?

**Math**

How do I find the relative maximum and minimum and the zeros of f(x)=-x^3+16x^2-76x+96??

**english**

what does SS stand for in Shurley Method?

**Geometry**

(3,-6)

**phyics**

Find the horizontal range of a baseball that leaves the bat at an angle of 63 degrees, with the horizontal with an initial velocity of 160 km/hr. discard air resistance

**physics**

the diver acheives a horizontal velocity of 3.75 m/s from a diving platform located 6.0 m above the water. How far from the edge of the platform will the diver be when she hits the water?

**Statistics**

A study shows that 10% of americans are left-handed. Find the probability that at most one student is left handed in a class of 20 students.

**Trig**

1. Establish the identity: sin(theta+3pi/2)=-cos(theta) 2. Find the exact value of 2(theta) if sin(theta)=5/13 3. Show that: csc2(theta)-cot2(theta)=tan(theta) 4. Find the exact value of tan(cos^-1(square root of 3/2) 5. Approximate the value rounded to two decimal places: csc...

**science**

which of the following is a testable hypothesis helium, ammonia, oxidation-reduction?

**physics**

A hockey player shoots a puck, exerting a constant force of 30.0 N on the hockey puck for 0.16 seconds. What is the magnitude of the impulse given to the puck? 190 kg ∙ m/s 98 kg ∙ m/s 9.6 kg ∙ m/s 4.8 kg ∙ m/s

**geometry**

the angles in a pentagon measure x-30,x+20,x-30, x+30 and x find the measure of each angle.

**geometry**

the angles in a hexagon are 135, 62, 151, 140, x and x +6. find the measure of the missing angles.

**chemistry**

What is the solubility of silver carbonate in 0.1 M Na2CO3

**chemistry**

What is the solubility of silver carbonate (Ag2CO3) in pure water

**world history**

How did powerful families of Japan like the Fujiwara legitimate their power at court?

**geometry**

If the sum of the lenghts of two sides of a triangle is 15, what is the largest possible integral value for the third side?

**chemistry**

PE increases

**Language**

Buttering

**Language**

Buttering

**Algebra 2**

How do you find a shaded area of a rectangle of 24 ft and 40 ft and 100 ft

**help please!:-)**

It wasn't right :(

**World History 201**

I need help with one T or false guestion. I don't know if this is true or false As a christian, persian king khosrow I forbade zoroastrian teaching troughout his empire.

**Chemistry**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.

**Please help!**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.

**Help please:-)**

What is the most important key to an effective essay?

**Chemistry**

Find the volume of 0.110 M hydrochloric acid necessary to react completely with 1.54 Al(OH)3. Please explain how to do this.

**Algebra 1 Scientific Notation**

1.462828271x10^99

**math**

the sum of the lenths of any two sides of a triangle must be greater than the third side. if a triangle has one side that is 17 cm and a second side that is 4cm less than twice the third side, what are the possible lenths for the second and third side?

**Algebra**

A runner wants to run 11.6 km. She knows that her running pace is 8.1 miles per hour. How many minutes must she run?

**geometry**

A.

**Chemistry**

For the following acid-base reaction, calculate the mass (in grams) of each acid necessary to completely react with and neutralize 5.00 g of the base. HCl(aq)+ NaOH(aq)->H20(l)+NaCl(aq) Please explain how to do this.

**social studies**

why might the earliest farming communities have developed along the Nile,Tigris,and Euphrates

**social studies**

how did rivres in southwest asia enrich the soil

**math**

the cube of what number is 2197?

**physics**

A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? What is the baseball's vertical velocity? How long does it take the baseball to get 28m in front of home plate?

**physics**

ummmmmmmmmmmm who the heck are you??? im asking a simple physics question if you have a problem then you can take it somewhere else darling:)

**physics**

A baseball player hits the ball at a speed of 20.1 m/s and an angle of 30 degrees. What is the baseball's horizontal velocity? 1m/s What is the baseball's vertical velocity? 2m/s How long does it take the baseball to get 28m in front of home plate? 3 seconds

**7th grade social studies**

how did rivers enrich the soil

**Chemistry**

Boron has only two naturally occurring isotopes. The mass of boron-10 is 10.01294 amu and the mass of boron-11 is 11.00931 amu. Use the atomic mass of boron to calculate the relative abundance of boron-10. Atomic mass of boron is 10.81 How do I solve this?

**Chemistry**

Thank you!

**Chemistry**

An alpha particle,4He2+ , has a mass of 4.00151 . Find the value of its charge to mass ratio in C/kg. How do I solve this?

**Chemistry**

What is the chemical name for BeCrO4*5H2O?

**math**

Find the distance that the earth travels in seven days in its path around the sun. Assume that a year has 365 days and that the path of the earth around the sun is a circle of radius 93 million miles. [The path of the earth around the sun is actually an ellipse with the sun at...

**Chemistry**

That's how I did it but the computer said it was wrong. I guess I'll have to ask the teacher about it. Thanks for your help!

**Chemistry**

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 2.7 (femtometers) and the radius of the atom is approximately 70 (picometers). The volume of the nucleus is 8.2×10^−8 pm^3 And the volume of the atom is 1.4×10^6 pm^3 I fo...

**geometry**

If X=5 units, x=11 units, h=10 units, what is the area of trapezoid shown above

**history**

what animal was a source of food for early hunters yet is not in existence today?

**history**

Where do archaeologists believe early Americans came from?

**Math**

Samual is 5 in , taller than Jackie - 8 shelly is 0.7 in taller than Jackie whos taller?

**Math**

The temperature at 3:00 am was -17 f by noon the temperture was -17.8 f at what time was it the coldest?

**math**

Evaluate write in simplest form Y - for y = -6 and z = -20 z

**CalcULUS**

nevermind

**CalcULUS**

Find slope of f(x)=x^3–2x^2+2x+2 on the interval (–3–1).

**CALCULUS**

Consider the function f(x)=sqrt(2–5x^2), –5≤x≤1. The absolute minimum value is ____ and this occurs at x equals ______? Found the max value to be 2 at x=0.

**math**

Thanks Reiny it helped alot

**physics**

A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?

**Algebra 1**

complete. 6t to the 2nd power - 23t + 20=(3t - 4)(2t - .....)

**Algebra 1**

Complete. g to the 2nd power - 8g+16=(g - 4)(g....4)

**Math**

Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. If the brother's age is represented by a, what is Luis' age? What will be the brother's age next year?

**statistics**

Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? A) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. B) Reject Ho if the s...

**peresonal finance**

how does education plays a critical role in financial success

**American Studies**

Affordable housing and improved transportation allowed people to begin to move away from central cities to the suburbs Think: When did affordable housing and highways come about? The industrial revolution gave rise to urbanization Think: When was the first occurrence of suburb...

**American Studies**

Identify two causes of urbanization (growth in city life) and explain how each changed the geography of the United States.

**calculus**

Pretend the program in Senegal had been reducing infant mortality at a rate of 12.2 % per year. How long would it take for infant mortality to be reduced by 31 %?

**chemistry**

If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?

**math **

heelp me with scientific nottion

**history**

In the 1950's, how did some corperations expand to protect themselves against the dangers of economic downturns?

**families in crisis**

What are some of the unique challenges facing Native American (Indian American) families, as described in pp. 471-487 in Ferguson? (Shifting the Center: Understanding Contemporary Families by Susan Ferguson) How is ageing seen differently in the Apache community than it is out...

**Chemistry**

A 10.0 ml sample of vinegar which is an aqueous solution of acetic acid, requires 16.5ml of a 0.500M NaOH solution to reach the endpoint in a titration (where the moles of acid are equal to the moles of base). What is the molarity of the acetic acid solution?

**finance**

It would take 11 years

**math**

Write a formula for the height of a trapeziod based on the formula for it area A= 1/2(base1 + base2)h

**Math**

Five balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white.

**Calc**

Suppose f(x,y) = A - (x^2 + Bx + y^2 +Cy). What values of A, B, and C give f(x,y) a local maximum value of 15 at the point (-2,1)? Any help would be appreciated!

**math**

Umm I think Its 60, if I know what you mean, if its a triangle. ( learned that if you press alt and 0176, it will give you the degree sign. A triangle is 180°. You take 40+80, and get 120. So then you take 180-120, and get 60°.

**physics**

2339

**Polynomial- Doublecheck2**

Thank You :)

**Polynomial- Doublecheck2**

I asked this earlier, but I didn't get an answer. I'm glad though, because I found a couple of typos. I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I am about 95% sure they are right, but ...

**math polynomials**

Alright, thank you:)

**math polynomials**

Simplify 4q^2-5q-1+8q^2+8q-9 A. -4q^2+3q+8 B. 12q^2+3q-10 C. -12q^2-13q-10 D. -4q^2-13q+8 I'm pretty sure its B. 12q^2+3q-10 Add (4x-2y) + (7x-5y) A. 11x+3y B. 11x-7y C. -3x+3y D. -3x-7y I think this one is B. 11x-7y, also.

**math**

-20 If The signs are the same, its positive. If the signs are different its negative.

**math**

really? The answer is -8.

**Urgent Math please check**

Very Important I can get someone to check these for me... I have to get an A, and I was wondering if someone could double check these for me. I am about 95% sure they are right, but just need a fresh set of eyes. I know I've been sending alot, but I really need them to be ...

**math**

Thank you so much, Reiny. I really appreciate you taking time for so many questions.

**math**

I have 14 questions and I was wondering if someone could check my answers. This is a do or die situation. If I don't get an A, I may not get to graduate. I really appreciate you taking your time to double check theses for me. Thanks if you do. I know its a lot. They are al...

**Math**

If you multiply each by -2 -1*-2=2 2*-2=-4 -4*-2=8 8*-2=-16 -16*-2=32 So the missing numbers are 8,-16

**math-triangles**

finding the hypotenuse for triangles with only one measure of 7.8 m and two angles with degrees of 90 and 40. The picture is a right triangle with the right angle on the bottom left(labeled S). The hypotenuse goes from the top left(making angle Q with the line going up from S)...

**math--Tangents**

Thanks

**math--Tangents**

Find the measurement of angle X given that tan X=0.5736 . Round to the nearest degree.

**Calculus**

"The production amount, Q, of an item manufactured by a company is modeled by the CobbDouglas function Q = 200(K^0.6)(L^0.4)(T^0.3) where K is the quantity of capital investment, L is the quantity of labor used, and T is the investment in training. Capital costs are $17 p...

**Pre Calc Trig**

Verify the following: tan( a + p/2) = -cot a a= alpha and p= pie since I do not have that button.

**Physics**

Oh and use the speed of sound of air (at 20 degrees C) to be v=343m/s.

**Physics**

Since it one end is open and the other is shut, the ear canal is considered a closed pipe. We set L = 2.3cm = 0.023m. The frequency for a closed pipe is fn=n(v/4L)=v/wavelength where n=1,2,3,.. referring to the number of overtones/harmonics. L=(1/4)*wavelength so we solve for ...

**alegbra 2**

if the length and width of the rectangle are 5 and 11 inches respectivly what is the approimate circufrence of the circle if the rectangle is inscribed inside the circle?

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