Saturday

April 19, 2014

April 19, 2014

Total # Posts: 2,001

**Physics**

A hydrogen atom initially in its ground state (n = 1) absorbs a photon and ends up in the state for which n = 3. What is the energy of the absorbed photon? *I found the energy of the atom at the ground state and at n = 3. I subtracted the final from the initial to get a value ...

**Physics**

a man jumps off a bridge to see how high it is. he measures his time of descent. he is in the air for 3.0 s before splashing into the water below. a. How high is the bridge above the water? b. How fast is the man going as he hits the water?

**Chem**

estimate the aqueous solubility, in milligrams per liter of AgBr(s) at 160 degrees C

**Chem**

For a solution that is 0.280 M HC3H5O2 (propanoic acid Ka=1.3*10^-5) and 0.0894 M HI, calculate the following. Concentration of H30, OH, C3H5O2-, I-

**math**

On the fastest speedways, some drivers reach average of 3 miles per minute. Write a formula that gives the number of miles M that such a driver would travel in X minutes. How far would this driver travel in 38 minutes?

**math**

on the fastest speedways, some drivers reach average speeds of 2 miles per minute. write the formula that gives the number of miles M that such driver would travel in x minutes. How would this driver travel in 37 minutes

**statistics**

"Separate the data by company and do descriptive stats for each. Copy and paste into a Word document, formatting appropriately. “Appropriate” includes formatting to a reasonable and appropriate number of decimals, including a good, descriptive caption for the ta...

**TX Goverment**

Does the state (Texas) system for raising revenue rely too much on regressive mechanisms like sales tax, user fees and licenses?

**math**

If you triple 4 and subtract 2 each day, how many days until you have zero?

**chemistry**

100 grams of a liquid completely fill a 200 ml bottle. What is the density of the liquid?

**physics**

The picture tube in an old black-and-white television uses magnetic deflection coils rather than electric deflection plates. Suppose an electron beam is accelerated through a 53.8-kV potential difference and then through a region of uniform magnetic field 1.00 cm wide. The scr...

**Math**

(2/$7.5)=(3.5/x) x=$13.125

**com155**

Thank you for your help!!

**com155**

Could you please tell me if the adjectives and adverbs below are correct for my paragraph? Adverbs- responsibly personally not every currently very Adjectives- credit much paying hard minimum one

**com155**

The following is a paragraph regarding my experience with credit cards. I had to use least five adverbs and five adjectives in my paragraph. I have to bold the adverbs and underline the adjectives, the only problem is I am having a hard time figuring out which are adverbs and ...

**com155**

Ok Sorry for the misunderstanding.

**com155**

I need to know the adverbs and adjectives in the paragraph.

**com155**

Having a credit card could get someone into much trouble if it is not used responsibly. I personally have nightmares when it concerns credit cards. I do not like paying interest on something when it is not necessary. I learned how to use credit cards the hard way. I ran up a c...

**physics 1001**

The pressure in each of your car tires is 2.10 105 Pa. The mass of your car is 1690 kg. Assuming that each of your tires bears one-quarter of the total load, what is the contact area of each tire with the road?

**math**

what part of a day is 45 minutes?

**rebus puzzle**

I need a good rebus sit to help sove some rebus puzzles. thanks!

**REBUS PUZZLES**

These letters are written in large bold print. LIF Next puzzle: A bold diagonal line going from right to left.

**REBUS PUZZLES**

The two letter E's one is over the V and R and the other letter E is under the T and D

**REBUS PUZZLES**

I need help with some rebus puzzles please. T H R O U G H The letters TRUH are in Bold color. E OV RRAT D E

**algebra**

If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times?

**Newton's 3rd Law**

How can I use Newton's 3rd law on a diver off of a diving board? Could I calculate friction against his feet?

**Calc. Help ASAP please**

the tuition at a college increases exponentially. the current tuition (let it be t=0) is 36,000 and in 2 years it will be 39,690. a) find a formula to predict the cost of tuition in t years. Is this right? And I'm stuck at the end. 39,690= 36,000e^(kt) 11.025=e^(kt) ln(11....

**science**

why is it so important to have only one set of chemical symbols in the world?

**science**

Is it possible to study just one atome?why?

**algebra **

What is the maximum number of cubes measuring 5cm on an edge that can be obtained by cutting a solid cube that measures 1 m on an edge?

**Calculus **

ok so apparently there's no way to express integral |f(x)|dx in standard mathematical functions... which I don't exactly buy... but ya the issue came up when I was trying to evaluate integral |x - 2|dx and apparently this is correct integral |x-2|dx = 2 - [(x-2)^2sgn(2...

**Calculus**

ok so apparently there's no way to express integral |f(x)|dx in standard mathematical functions... which I don't exactly buy... but ya the issue came up when I was trying to evaluate integral |x - 2|dx and apparently this is correct integral |x-2|dx = 2 - [(x-2)^2sgn(2...

**calculus**

use the fact that integral dy/dx dx = integral dy = y find the antiderivative and plug in e and 9 to solve for the constant... i think...

**physics**

How far will a car moving at 50 miles an hour travel in the time it takes to sneeze?

**math**

how do i solve this problem? -4n+5m-2-6n+4-3m

**physics**

A child in a boat throws a 6.00 kg package out horizontally with a speed of 12.0 m/s, Fig. 7-28. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25.0 kg and that of the boat is 50.0 kg. Magnitude ___m/sDirection

**Word problem solving with graph equation**

Assignment Part I: A system of equations can result in 3 possibilities: consistent, inconsistent, and dependent. Discuss each of these types of solution that can be generated, and describe the graph of each possibility. Part II: Break-Even Analysis and Cost Analysis: As a firs...

**calculas**

If sin theta equals two third and zero degrees less than theta less than 90 degrees find cosine theta

**algebra**

The constraints don't show when I cut and paste so I will type them out, sorry! 0 less than or equal to x less than or equal to 10, 0 greater than or equal to y greater than or equal to 5 and 3x + 2y less than or equal to 6

**algebra**

Find the maximum value of the objective function z=24x+7y subject to the following constraints: 1. 0¡Üx¡Ü10, 0¡Üy¡Ü5. 3x + 2y ¡Ý 6

**physics**

A 8.00 kg shell at rest explodes into two fragments, one with a mass of 2.00 kg and the other with a mass of 6.00 kg. If the heavier fragment gains 130 J of kinetic energy from the explosion, how much kinetic energy does the lighter one gain?

**computer fun**

My sister has no websites to go to for fun.She is 10 so what do you suggest?

**math**

during a special promotion, each customer who makes a purchase is given a coupon for a discount of either 10,20, 30,40, or 50 percent. if a customer has an equal chance of receiving any one of the 5 types of discount coupons,what is the probability that the first customer will...

**Physics**

A spiral spring is compressed so as to add U units of potential energy to it. When this spring is instead stretched two-thirds of the distance it was compressed, its remaining potential energy in the same units will be a. 2U/3 b. 4U/9 c. U/3 d. U/9

**Physics**

Two lumps of clay having equal masses and speeds, but traveling in opposite directions, collide and stick together. Which of the following statements about this system of lumps must be true? A. The momentum of the system is conserved during the collision. B. The kinetic energy...

**Physics**

A glider airplane is coasting horizontally when a very heavy object suddenly falls out of it. As a result of dropping this object, the glider's speed will a. increase. b. decrease. c. remain the same as it was.

**Physics**

Cart A, of mass 3.00 kg, approaches and collides with cart B, which has a mass of 7.00 kg and is initially at rest. When the springs have reached their maximum compression, a. cart A has come to rest relative to the ground. b. both carts have the same velocity. c. both carts h...

**Physics**

A proton with a speed of 4.20×104 km/s makes an elastic head-on collision with a stationary carbon nucleus. We can look up the masses of both particles. Which of the following quantities can be calculated from only the known information? A. The velocity of the proton and...

**Physics**

You drop an egg from rest with no air resistance. As it falls, a. only its momentum is conserved. b. only its kinetic energy is conserved. c. both its momentum and its mechanical energy are conserved. d. its mechanical energy is conserved, but its momentum is not conserved

**Physics**

A heavy rifle initially at rest fires a light bullet. Which of the following statements about these objects is true? A. The bullet and rifle both gain the same magnitude of momentum. B. The bullet and rifle are both acted upon by the same average force during the firing. C. Th...

**Physics**

Which of the following statements is true for an elastic collision? A. Both momentum and kinetic energy are conserved. B. Momentum is conserved, but kinetic energy is not conserved. C. Kinetic energy is conserved, but momentum is not conserved. D. The amount of momentum lost b...

**physics**

Which of the following statements is true for an inelastic collision? A. Both momentum and kinetic energy are conserved. B. Momentum is conserved, but kinetic energy is not conserved. C. Kinetic energy is conserved, but momentum is not conserved. D. The amount of momentum lost...

**physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 4.00 s. If the magnitude of the momentum of the lighter cart after the push is P, the magnitude of the momentum of the heavier cart is ...

**Physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 6.00 s. If the kinetic energy of the lighter cart after the push is K, the kinetic energy of the heavier cart is A. 1/4 K B. 1/2 K C. K...

**chemistry**

calculate the mass of water produced when 3 g HCL reacts with excess sodium carbonate

**trig**

y=sin pie divied by 2 theta

**chemistry**

A pair of students performs an experiment in which they collect 27 g CaO from the decomposition of 41 g CaCO3. Are these results reasonable? Explain your answer using percentage yield.

**Government**

Do you think that governors should have significant powers? I know there are about 14 states, Texas being one that their governor has very little power. But why should these governors be allowed more?

**math**

I have $6400 to invest at 8% and 6%. What amount is to be invested at 8% in order to earn double the interest of 6%

**Math **

Fred says "To find 6x8,I can use the facts for 5x4 and 1x4." Do you agree? Explain.

**math**

What multiplication fact can be found by using the arrays for 2x9 and 5x9?

**math**

it is $385 and they each had $165 left

**math**

plain and simple it is $385 they each had $165 left over

**science**

I need help doing examples for newton's 3 laws of motion....can you help me?

**math **

Explain how you can break apart 3x9 to help you multiply.

**math**

Explain how you can break apart 3times 9 to help you multiply.

**reading**

List 10 words that end in -ship and mean 1.quality of or state of, 2.or rank of

**reading**

What is the use of telomerase?

**math**

thanks alot

**math**

help me

**math**

-4-(4)=

**maths**

there are 8 doors behind each door is a number each number is less than 20 no 2 numbers are the same they add up to 93 what are the numbers

**math**

Is 8.5 greater then , less then or equal to -1000? 8.5__-1000 (<,>,=) PLEASE HELP ME

**math**

Stacy multiplied 5x9 and said the answer was 44. What two patterns could you use to show that the answer is not correct?

**Math**

Is 30 a multiple of 5? How do you know?

**Math**

Shawna thinks that 8x2=17. What number pattern shows that she is not correct?

**math**

Jay is 150 cm tall. He can reach 55 cm above his head. A ball is thrown 268 cm in the air. How many centimeters must Jay jump to cathch it?

**Math**

if you ride your bike 23 kilometers in 1.5 hours,wht is your average speed?

**com170**

Write five sentences about the role of education in successful financial planning in the spaces on the following page. Correctly use a different verb tense in each sentence. Highlight each verb in yellow and identify the tense in parentheses.

**Math**

Which fraction is equal to 1/5? A.2/10 B.3/10 C.1/15 D.2/15 Can you show me the steps?

**Physics help on the TI-84 calculator**

(3*2nd+8)/(5.4*2nd+14)

**math**

can you explain how you got the answer?

**math**

can you explain how you got the answer?

**math**

a farmer wants to build a rectangular pen using a side of a barn and 60ft of fence. find the dimensions and area of the largest such pen

**Math**

A change purse contains an equal number of pennies, nickels, and dimes. The total value of the coins is 112 cents. How many coins of each type does the purse contain?

**science**

a)why do chemist prefer to read/ record the absorbance, rather that the percent transmittance, of light when analyzing a sample having a visible color? b) three parameters affect the absorbance of a sample. Which one is the focus of this experiment?

**Physics**

A 100-Watt light bulb plugged into a 120-Volt outlet is left on for 60 seconds. How much energy (in Joules) is used up by the bulb during this time?

**Math**

4(2x+1)-29=3(2x-5) I need help

**math**

Chloe used 30 toothpicks as edges to make a model for a prism. How many sides did the base of her prism have? How many vertices?

**math**

peer has $4.20 in dimes and quarters. He has 21 coins. How many coins of each kind does he have?

**math**

4TIMES9OVER30-KOVER16

**Algebra**

I think I figured it out. x=3 y=5 z=-1

**Algebra**

Solve the system: 3x-y+z=3 -x+y+2z=0 -5x+3y+2z=-2 x= y= z=

**Physics**

0.490 mol of argon gas is admitted to an evacuated 50.0 cm^3 container at 60.0 C. The gas then undergoes an isochoric heating to a temperature of 400 C. What is the pressure?

**math**

how do you find out the perimeter and the area of a parollelogram in a short cu way in a centimeter grid paper?

**physics**

A light bulb is wired in series with a 133-Ω resistor, and they are connected across a 120-V source. The power delivered to the light bulb is 22.5 W. What are the two possible resistances of the light bulb?

**math- check me**

Find the slope of the line graphed below. Points are (-4,-1) and (4,3) Is the slope 4/8 ?

**Math**

It was P(x)=2x^3-5x^2-9 I got 0 and x-3 is a factor

**Math**

Use the Factor Theorem to determine whether x-3 is a factor of P(x)=2x^3-5x^-9 . Specifically, evaluate P at the proper value, and then determine whether x-3 is a factor. P(_)=__ also pick which one applies x-3 is not a factor of P(x) x-3 is a factor of P(x)

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