Monday

October 20, 2014

October 20, 2014

Total # Posts: 1,677

**Physics**

The kinetic energy of a proton is half its internal energy. What is the proton's speed? Kinetic energy is (Yu - 1) (mp) (c)^2 = 1/2 (mp) (c)^2 Yu = 1.5 Yu = 1/(square root) 1 - (u/c)^2 1/(square root) 1 - (u/c)^2 = 1.5 u= 0.745c How do I solve for u? I'm extremely ...
*January 18, 2013*

**trig proofs**

cotx+tanx=secx+cscx
*January 15, 2013*

**Math**

Number Sense How can you use 4 x 7 to find 8 x 7? Find the product.
*January 8, 2013*

**Calculus II**

ok thank you very much. Happy New Year
*December 30, 2012*

**Calculus II**

Find x and dx using trigonometric substitution of (integral) square root of 4x^2 - 9 divide by x x = 2/3 sec x dx = 2/3 tan x dx Is this right so far?
*December 30, 2012*

**Calculus II**

ok, thank you very much. Happy New Year
*December 30, 2012*

**Calculus II**

Okay then, is this the final answer = (5-x)(3e^3x) + (integral) -- (1/3)e^3x = (5-x)(3e^3x) + (1/9)e^3x + C
*December 30, 2012*

**Calculus II**

Integrate using integration by parts (integral) (5-x) e^3x u = 5-x du = -dx dv = e^3x v = 3e^3x I wonder if this is right so far. = uv - (integral) v du = (5-x)(3e^3x) - (integral) (-3e^3x) =(5-x)(3e^3x) + (integral) (3e^3x) = (5-x)(3e^3x) + 9e^3x + C
*December 30, 2012*

**Chemistry**

Question: A solution of Silver nitrate, AgNO3, contains 1.08 grams in 250 cm3. What is its molarity? Solution: Molar mass of Silver nitrate = 108 g/mole. n(AgNO3) = 1.08 grams of AgNO3 x 1 mole of AgNO3108 grams AgNO3 = 0.01 mole. Number of moles in 1 dm3 = 0.01 mole x 1000/...
*December 30, 2012*

**Physics**

11 4 n + B ----> ___?___ + He 2 7 8 A. Li or B. Li 235 4 Pa ------> ___?___ + He 91 2 A.230 or B. 231 Ac Ac
*December 18, 2012*

**math**

the expression a^2(b^3)/a^-4(b^2) is equivalent to 1 a^6/b^5 2. b^5/a^6 3. a^2/b 4. a^-2(b^-1)
*December 18, 2012*

**Physics**

A car and a bus are moving down a hill, the bus is 3X heavier than the car and the speed of the car is 3X faster than the bus. Compare their momentum and K.E.
*December 17, 2012*

**Physics**

Who originally designed the planetary model of an atom? Bohr or Rutherford
*December 17, 2012*

**physics**

Maxwell's equations proved that a. Light is a mechanical phenomena b. Light is a chemical phenomena c. Light is a phenomenal phenomena d. Light is an electromagnetic phenomena I think the answer is either a or d. But I'm pretty sure its d Thank you for any help and ...
*December 16, 2012*

**8th Grade English**

My teacher for my english class at school marked off for these questions and said I could redo it and turn it in tomorrow. I am for sure I did these right. Here are the questions. Underline the verb in the parentheses that agrees with the subject. 1. In the Northern Hemisphere...
*December 11, 2012*

**Physics, asap please**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
*December 10, 2012*

**Science **

What is the Mass number and Atomic number for the element B (Boron)? It is for a homework sheet and I am blanked out. I forgot my text book. Can anyone help me?
*December 10, 2012*

**Chemistry 3A**

You have three moles of oxygen and hydrogen. And 1 mol of aluminum as well as one mole of aluminum hydroxide
*December 10, 2012*

**Chem**

PV = nRT - Change pressure to atm - Change grams of oxygen to mol of oxygen for n - Change degrees in celsius to kelvin which in this case is 273 K. Write all of the units of P, n, R and T and it will cancel out to get liters for volume
*December 10, 2012*

**Physics**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
*December 10, 2012*

**Physics**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
*December 9, 2012*

**Physics**

Pretend the hot brick extracts heat from the cold brick and becomes hotter. Would this violate the Law of Conservation of Energy?
*December 9, 2012*

**Physics**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...
*December 9, 2012*

**Physics**

A rapidly changing magnetic field in any region of space induces a rapidly changing A.Magnetic field or B.Electric field? which in turn induces a rapidly changing A.Magnetic field B.Electric field?
*December 8, 2012*

**Physics**

If your own mass is 70kg and the mass of a building is 4x 10^6kg and the distance between you and the building is 1m, in comparison to your own weight, estimate the force of attraction between you and the building.
*December 8, 2012*

**Physics**

A car weighing one ton is moving at 50km/hr and a truck weighing two tons is moving at 25km/hr. Both are moving in the opposite direction, which has more momentum? I think they are the same, but want to make sure
*December 8, 2012*

**Physics**

While stationary on a boat you are measuring the time it takes for the coin to leave your hand and hit the water.In order to measure that time you are tuned to the sound of the coin hitting the water. You know that it takes 5.5 seconds for the coin to leave your hand and hit ...
*December 8, 2012*

**Physics**

If one drops a sphere and a piece of paper from the same height of 10 meters(H=10m) and the sphere hits the ground in 1.4 secs and the paper in 2 secs, what is the gravity associated with the sphere and why did the impact time change between the paper and sphere?
*December 8, 2012*

**social studies**

what is the question to usa studies weekly 9
*December 4, 2012*

**science**

What does it mean to be a successful organism? Is bacteria the most successful organisms on earth?
*November 29, 2012*

**College Physics 1**

.767s
*November 28, 2012*

**ENGLISH**

hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
*November 27, 2012*

**english**

hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
*November 27, 2012*

**College Physics**

Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet.
*November 27, 2012*

**physics**

The range of human hearing extends from approxmately 20 HZ to 20 000 HZ. Find the wavelenghts of these extremes when the speed of sound in air is equal to 343 m/s. A dolphin is 25 degrees C sea water emits a sound directed toward the bottom of the ocean 150 m below. How much ...
*November 21, 2012*

**algebra**

are you factoring? we are doing that right now if you need help
*November 21, 2012*

**social studies**

what religion was part of the Song Dynasty ?
*November 18, 2012*

**reading**

"It's raining cats and dogs" is an idiom for "it's raining really hard."
*November 8, 2012*

**Physics**

A 60 mm mortar round is capable of being launched at 540 km/hr. If a target is located at a distance of 0.6 km and the mortar takes 7.5 s to reach the target, at what angle must the launcher be set to hit the target?
*November 7, 2012*

**precal**

We have to use the equation f(x+Δ)-f(x) ----------- Δx
*November 6, 2012*

**precal**

Find the Difference quotient: 4/(x-3)^2
*November 6, 2012*

**algebra**

Writing an equation in standard form is good for using the quadratic formula, because it has A, B, and C. I hope that helps :)
*November 5, 2012*

**AP Chemistry**

A 2.50 L balloon is filled with helium gas at sea level, 1.00 atm and 32 degrees celsius. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 228 mm Hg and the temperature is -44 degrees celsius, what is the volume of the balloon?
*November 1, 2012*

**7th grade math Ms. Sue please!**

I need help with this too! Math is hard for me right now...
*October 30, 2012*

**chemistry**

To what volume must 25.0mL of 18.0M H2SO4 be diluted to produce 1.50 M H2SO4?
*October 28, 2012*

**chemistry**

A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?
*October 28, 2012*

**chemistry**

i do not understand how to work the problem out.
*October 28, 2012*

**chemistry**

If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?
*October 28, 2012*

**MATH**

Given Pr(a)= 0.9, Pr(C|A)= 0.78 and Pr(D|B) = 0.38. find a. (A|C) = b. (A|D) = c. (B|C) = d. (B|D) =
*October 22, 2012*

**physics**

A hydrogen atom has a diameter of about 10.1 nm. Express this diameter in meters, millimeters, and micrometers.
*October 22, 2012*

**Finite---- PLEASE HELP**

A biologist finds that 32% of fruit flies have short wings and 27% have eye defects. Assuming these two events are independent, what is the probability that a randomly selected fruit fly has neither short wings nor eye defects?
*October 22, 2012*

**U.S History**

Why did slavery continue after the Revolution?
*October 17, 2012*

**Algebra **

sorry, having a brain malfunction but which is a function: "x is a student y" "x is the biological daughter of mother y"
*October 8, 2012*

**living enviornment**

what is the average length of a single cell in micrometers? a)2,000um b)100um 3)10um 4)200um
*October 4, 2012*

**math**

The rate is: type # of vehicles car 6 truck 10 SUV 14 Mini Van 15
*October 4, 2012*

**physics**

The Hubble Space Telescope orbits Earth 621 km above Earth's surface. What is the period of the telescope's orbit? Give answer with 5 significant figures.
*October 3, 2012*

**english**

use words 9-15 in a creative story. can you please help me!! besiege ephemeral altruism carrion erotic amorphous opulent I KNOW WHAT THEY MEAN I JUST NEED HELP FIGURING OUT HOW TO USE THEM IN A STORY
*October 1, 2012*

**algebra**

3x^3+x^2-12x-4=0
*October 1, 2012*

**Physics**

A crate with a mass of 50 kg has a coefficient of static friction with the floor of 0.8 and a coefficient of kinetic friction of 0.25. If it is pushed with a force of 425 N, how long will it take to move it across a 65 meter horizontal floor?
*October 1, 2012*

**Check my Essay?**

np
*September 20, 2012*

**Check my Essay?**

i like it
*September 20, 2012*

**science**

what are u learning about ?
*September 20, 2012*

**science**

thanks again
*September 20, 2012*

**science**

pleasee sumonee answerr this quick!!!!!!!!!! asap
*September 20, 2012*

**science**

why is scientific inquiry a process with many paths, not a rigid sequence of steps?
*September 20, 2012*

**science**

thanks
*September 20, 2012*

**science**

how are the purposes of science and technology different?
*September 20, 2012*

**Physics**

Imagine a very large nonconducting plate that has a uniform surface charge density σ =1 μC/m2; it also shows a point charge Q = -3 μC at distance d = 0.3 m from the plate. Both are fixed in place. We choose the origin of an x-axis at Q. At what positive ...
*September 19, 2012*

**Physics**

Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
*September 19, 2012*

**Physics**

Find the magnitude of the acceleration (in m/s2) for an electron in a uniform electric field with a magnitude of 100 N/C. and Find the time it takes (in sec) for an electron initially at rest in a uniform electric field of 110 N/C to reach a speed of 0.01c (where c is the ...
*September 19, 2012*

**precal**

Solve for y: (y-(10/y))^2+6(y-(10/y))-27=0
*September 18, 2012*

**precal**

solve for x: (x^2-2x)^2 -11(x^2-2x)+24
*September 18, 2012*

**Math**

anyone. please. i can't finish my homework without this help. I would realllllly appreciate it.
*September 17, 2012*

**Math**

how would you find the inverse function of a problem when you have a squared number like f(x)=(x^2-4)^2 PLEASE HELP
*September 17, 2012*

**Chemistry**

I'm doing a chemistry lab called colorimetric equilibrium study of a complex ion. But I just have one question which is how to obtain CS which is the total stoichiometric molarity of thiocynate ion and CF which is iron (III) iron. Fe+3 + SCN --> Fe(NCS)^+2 Fe(NCS)^+2 + ...
*September 13, 2012*

**Physics**

A stone is thrown straight upward with a speed of 12 m/s from the edge of a 70 m high cliff. How long is the stone in the air? What is the speed just before it hits the ground? What is the total distance the stone traveled?
*September 12, 2012*

**child day care**

Jean Piaget was a A. factory worker. B. pediatrician C. developmental psychologist. D. child care provider.
*September 12, 2012*

**statistics**

if the mean=100 and the standard deviation=8, calculate p(x>108)
*September 11, 2012*

**precal**

(x^2+11)/(3-x) x=4i
*August 21, 2012*

**precal**

Preform the indicated operations and write the results in standard form. ( i= imaginary number) √-12(√-4-√2)
*August 21, 2012*

**physics**

in a baseball game a 0.2 kg ball moving at 12 m/s is hit by a bat. after the impact the ball moves in the opposite direction with a velocity of 18 m/s. if the force exerted on the ball of the batter is 670 N. how long is the time of contact
*August 20, 2012*

**Algebra 1**

Yes, I think I got it. h2+8h+-16 H2-16=0 H2=16 squareroot of 16 = 4
*August 13, 2012*

**Algebra 1**

How to find the product? For example (h+4)(h-4)
*August 13, 2012*

**chemistry**

A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________. A. 0.413 B. 0.386 C. 0.163 D. 0.579 E. 0.237
*July 24, 2012*

**chemistry**

Thank you so much that cleared up a lot!
*July 24, 2012*

**chemistry**

A 20.0 mL sample of 0.687 M HBr is titrated with a 0.216 M NaOH solution. The pH after the addition of 10.0 mL of NaOH is __________.
*July 24, 2012*

**History.**

How did the role of the federal government change during the Progressive Era of the early 1900s. Include specific progressive legislation, discuss presidents and the enhanced power of the federal I need some help with finding some information and understanding
*July 18, 2012*

**Math**

What is the length of each side of a square that has the same area as a rectangle that is 12 mm long and 18 mm wide?
*July 16, 2012*

**physics**

A block is initially sliding along a horizontal surface with 24.6 J of kinetic energy. Friction causes the block’s speed to be halved in a distance of 3.20 m. a) What is the kinetic energy of the block after traveling the 3.20 m? b) What is the magnitude of the kinetic ...
*July 16, 2012*

**biology**

What are biomes and how are they influenced by latitude and elevation? Give Examples
*July 12, 2012*

**divission**

how do i do a 7 by 10 array look like
*July 11, 2012*

**Physics**

You (65 kg) are standing in an elevator traveling upward that passes the 3rd floor at 3.5 m/s and then passes the 4th floor at 4.5 m/s one second later. Find the normal force exerted on your feet by the elevator while it is passing between these floors. I got 6565 N, because ...
*June 21, 2012*

**math**

(35) + (-13) + (8) - (-6) = 35 -13 +8 + 6 = 49 - 13 = 36
*June 20, 2012*

**math**

4p + 9 + (-7p) +2 = 4p -7p + 9 + 2 = -3p +11 = 11-3p
*June 20, 2012*

**math**

4m + 9 + 5m -12 = 42 9m - 3 = 42 9m = 45 m = 5
*June 20, 2012*

**math**

y/9 + 5 = 0 y/9 = -5 y = -5 * 9 y = -45
*June 20, 2012*

**math**

3q+ 5 + 2q - 5 =65 5q = 65 q =13
*June 20, 2012*

**math**

-282 -(+1,017) -282 - 1017 = -1299
*June 20, 2012*

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
*June 18, 2012*

**Physics**

At time t = 0, you shoot a cannonball horizontally from the roof of a building at a velocity of 10 m/s. The building has a height of 80 m. Assume g = 10 m/s2 and that there is no air resistance. Write down the algebraic velocity equation for the y-direction of the ball with ...
*June 18, 2012*

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