Thursday

April 24, 2014

April 24, 2014

Total # Posts: 323

**3rd grade math**

Explain how you know 6/6 and 1 are equivalent?

**probability **

a teacher on her way to work passes through 3 stoplights each morning. the distances between the stop lights are great and the lights operate independently of each other. if the probability of the red lights are .4,.8 and .6 for each light, what is the probability to the neare...

**language arts**

Thank you it is!!

**language arts**

which of the sentences below is punctuated correctly? A.I opened the door and my cat ran outside. B.I opened the door, and my cat ran outside. C.I opened the door, my cat ran outside. I think its B

**science**

How often would a restriction enzyme such as Not I, which has 8 nucleotides in its recognition sites 5’-GCGGCCGC-3’, cleave DNA on average? Would it cleave a species DNA more or less often if the DNA from that species were 70% A-T rich?

**Physics Help**

Find components of vector -2r

**science**

How might the formation of Pangaea have led to mass extinctions at the end of the Permian period, about 250 million years ago?

**Please i needd an answer asap!!!**

Nevermind i got it. Thank you so much:)

**Please i needd an answer asap!!!**

A, right?

**Please i needd an answer asap!!!**

Ok thank you, so for number two its D? because i looked up the meaning of the word simulation and none of it matched with the the answers nor was it close

**Please i needd an answer asap!!!**

@Ms.Sue

**Please i needd an answer asap!!!**

I need a little help Ms. Sue. But for the first one i think its A For the second one C Third C

**Please i needd an answer asap!!!**

I give medals and 'best answer' :) I need help asap! Which of the following is one way to assess whether or not a learning game is effective? a. Being able to win the game b. doing a quiz before and after the game to see what you have learned c. Making it difficult to ...

**language art 8**

Please help me, i really need to get this. the only question/essay im stuck on. Answer the following questions about the essay "Escaping." Give an example of one internal and one external conflict from the selection (5 points). I need your help!

**physics**

A barefoot ﬁeld-goal kicker imparts a speed of 44 m/s to a football initially at rest. If the football has a mass of 0.49 kg and the time of contact with the ball is 0.028 s, what is the magnitude of the force exerted by the ball on the kicker’s foot?

**A/P Calculus**

A Cyclist is riding on a path whose elevation is modeled by the function f(x) = 0.08(16x-x^2) where x and f(x) are measured in miles. Find the rate of change of elecation when x=4. Would this be 0.64? dx/dt would be 1.28 - 0.16x and then plug in four?

**A/P Calculus**

The derivative of 0.2x is 0.2 ! ohh so when you plug in the five is it just the same outcome 00.2? f(5)=0.2?

**A/P Calculus**

It is a straight line slope so i would say they depend on each other so the rate of change of elevation when x=5 would be 1?

**A/P Calculus**

A cyclist is riding on a path whose elevation is modeled by the function F(X)=0.2x where x and f(x) arte measured in miles. Find the rate of change of elevation when x=5. ? Supposed answer: ?? 1

**physics**

A scale is marked off in centimeters on a long table. A coin initially at the position labeled 130.0 is moved to the position marked -20.0. What is the displacement of the coin?

**chemistry**

Suppose you are asked to find the area of a rectangle that is 2.1-cm \rm cm wide by 5.6-cm \rm cm long. Your calculator answer would be 11.76 cm 2 \rm cm^2 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to...

**MATH**

Julie is solving the equation x2 + 6x + 9 = 0 and notices that the discriminant b2 - 4ac has a value of 0. This tells her that the equation has...

**12th grade goverment**

who could vote in elections for colonial legislatures

**Medical Billing and Coding**

The answer to number 18 is Medicare Part A. Part A covers hospitals. Part B covers medical. Part C was implemented so that those with part a and part b could have more options. Part D is for prescription drug plans.

**Medical Billing and Coding**

The answer to number 7 is the Balanced Budget Act. I'm sure you've figured that out already but I'm not sure if fellow readers with the same question are able to read other responses.

**chemistry**

how do i find the specific heat of a metal??

**Chemistry**

How much silver is present in 3.5 ml of a 1 molar silver nitrate solution?

**PHysics**

The sound emitted by bats has a wavelength of 3.45 mm. What is the frequency in air? The speed of sound in air is 343 m/s.

**Physics**

If a proton is moving in a magnetic field with a speed of 4 × 106m/s and is executing uniform circular motion with a radius of 10 cm, what is the magnetic field?

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.

**Physics**

A charged particle is moving downward with an initial speed of 5 × 106m/s when it encounters a uniform magnetic field that points east to west. (a) If the initial force on the particle is to the north, is the particle positive or negative? (b) If B = .25 T and the partic...

**Physics**

An electron with a velocity of v = (3 x + 4 y + 2 z) × 106m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1 x - 2 y + 4 z)T. If the electron experiences no force as it moves, calculate the electric field.

**Physics**

An electron is shot into a uniform magnetic field B = (.5 x + .8 y)T with an initial velocity of v = (4 x + 3 y) × 106m/s. What is the force on the electron?

**Physics**

Electric charge flows through a wire, which naturally has a cylindrical cross section. Suppose the charge has a current density given by J = A/r, where A is a constant and r is the distance to the wire's central axis. How much current flows through the wire if its radius i...

**Physics**

Water flows through a pipe of radius 4 cm at a rate of 3.5 m/s. Suppose each water molecule is singly ionized (highly unrealistic). What is the electric current density associated with the flow of these ions? What is the electric current in the pipe?

**statistics**

PLEASE HELP

**statistics**

Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the probabili...

**help with physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?

**help with physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge pass...

**help with physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?

**physics**

A 15 ohm resistor is made from a copper wire of mass 14.2 grams. What is the wire's diameter and length?

**Physics**

An electric filament can heat 200 cm3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?

**Physics**

A gold wire and a silver wire have the same dimensions. At what temperature will the silver wire have the same resistance that the gold wire has at 20°C?

**Physics**

A bird stands on a bare power line carrying 2500 amps of current. 600 meters of this wire has a resistance of .009 ohms. If the bird's feet are 3 cm apart, what is the voltage difference between the bird's feet?

**Physics**

(a) The current through a wire is a steady 2.5 amps. How much current passes through it between t = 0 seconds and t = 4 × 10-4 seconds? (b) The current through a wire is given by I(t) = I0e -at, where I0 = 2.5 amps and a = 6 × 103 s-1. How much electric charge pass...

**Physics**

You have two metal spheres, one with radius 10 cm, the other 7 cm. They each possess a charge of 3 x 10-6 Coulombs. If you touch them together and let the charge come to equilibrium, how much will there be on each sphere?

**Physics**

A capacitor is made from two parallel plates separated by a distance d, and each has area A. The capacitor holds a charge Q. (a) What is the energy stored in the capacitor? (b) A mechanical force pulls the plates apart, without changing the stored charge, until they are 2d apa...

**Physics**

What is the maximum charge that can be put on a conducting sphere of radius 15 cm if it is not to spark? That is, the electric field at its surface cannot exceed the dielectric strength of air. b) What is the sphere's voltage at this charge?

**Physics**

If the electric potential is given by V = (-1 volts/m4 )x2yz + (4 volts/m2)yz, find the electric field.

**Physics**

The work done by an external force on an electron as it moves from point A to point B is 6.3 × 10-14 J. If it was started from rest and had 3 × 10-14 J of kinetic energy when it reached B, what is the potential difference VB-VA?

**Statistics**

Suppose a data set has a linear regression line of y = 6 -0.8x. If the mean of the x's is 5, what is the mean of the y's? 2 5 10 6 None of the above

**Physic Help**

Charge is distributed through an infinitely long cylinder of radius R in such a way that the charge density is proportional to the distance from the central axis: ß = A r, where A is a constant and ß is the density. (a) Calculate the total charge contained in a seg...

**Physic Help**

Charge is uniformly distributed along the x axis with density ß. Use Gauss' Law to find the electric field it produces, and use this to calculate the work done on a charge Q that moves along the y axis from y = a to y = b.

**FInance**

Assume that you have $10,000 which you plan to invest for 3 years. How much more would you have if you invested the funds at 10% with annual compound interest versus 10% with simple interest? No funds will be paid until the end of the 3rd year.

**Physics Help**

An electron with velocity v = 2.4 × 106 m/s i encounters an electric field E = 1250 N/C i. How long will it take for the speed to be one fourth its original value?

**Physics Help**

Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?

**Physics Help**

Charge is distributed uniformly along the x axis with density ßx and uniformly along the y axis with density ßy. Calculate the electric field at the points (a) r = a i + b j, and (b) r = c k.

**Physics**

Two identical rods are placed end to end, separated by a gap of width D. Each rod has charge Q spread uniformly along its length L. Calculate the force between the rods. I need some help. My teacher doesn't give us much help. Thank you!

**Physics**

Two identical rods are placed end to end, separated by a gap of width D. Each rod has charge Q spread uniformly along its length L. Calculate the force between the rods. I need some help. My teacher doesn't give us much help. Thank you!

**Physics**

Find positions on the x axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0.

**Physics/Charges**

Point charges Q1 = 50 µC and Q2 = -20 µC are placed 2 meters apart. Where can I put a third charge so that the net electrical force on it is zero?

**Physics**

Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.

**Math/Physics**

Two identical tuning forks have frequencies of 512 Hz. If one is held by a listener while the other approaches at a speed of 7.2 m/s, what does the listener hear?

**Physics**

If the seventh and fourth standing wave frequencies of a string differ by 144 Hz, what is the fundamental frequency of the string?

**Physics**

Two objects are connected by a light string that passes over a frictionless pulley as in the fi gure. One object lies on a frictionless, smooth incline. In the figure, m1 = 8.48 kg, m2 = 4.84 kg, and theta = 40.2 degrees . When we let go of the mass m1, it accelerat...

**science**

An archer exerts an average force of 194 N to draw a 0.25 kg arrow back 1.2 m with the string of the bow. How much work does the archer exert?

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?

**Physiology**

How are Lower Body Negative Pressure and hemorrhage similar and different?

**Physics**

A football punter accelerates a football from rest to a speed of 9.1 m/s during the time in which his toe is in contact with the ball (about 0.247 s). If the football has a mass of 484 g, what average force does the punter exert on the ball?

**Algebra 2**

how do i simplify this expression? 9x^2 16x^4y^2 -------- x -------- -4x^3y^4 25xy

**Chem help **

Calculate the pH of a solution containing 0.00001 moles of H3O per liter.

**math**

i am a 2 digit number when i am rounded to the nearest 10 my 10 digits are less than my ones digit what number am i

**math**

i am a 3 digit number when i am rounded to the nearest 100 my hundreds digits is one less than my tens digit and 2 less than my ones digit what number am i

**math**

I am a 3 digit number when i am rounded to the nearest 100 I become 800 when i am rounded to my hundreds digit does not change i have more ones than 10 I am even the sum of my digits is 20 what number am i

**math**

i am a 2 digit number when i am rounded to the nearest 10 my 10 digits are less than my ones digit what number am i

**math**

i am a 3 digit number when i am rounded to the nearest 100 my hundreds digits is one less than my tens digit and 2 less than my ones digit what number am i

**math**

thank you steve

**math**

i am a 3 digit number when i am rounded to the nearest hundred i become 300 my hundreds digit is 2 the differance between my ones and tens digits is one my tens digit is my largest digit i am an odd number what 2 numbers can i be

**Chem help **

For which of the following molecules would the intermolecular forces be influenced mainly by dipole-dipole forces? PH3 CH3OHO HF C2H5OH CH3COCH3 how do I determine this

**Science**

the number of grams of CuSo4 times 5 H2O that will dissolve in 100g of H20 at 100 degrees

**Math**

I am stuck on a problem. Can Somebody tell me what the next number is in the pattern 9,11,15,20,25?

**Chemistry**

A volume of 40.0 of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 20.2 of 1.50M H2SO4 was needed? The equation is 2KOH(aq)+H2SO4(aq)--->K2SO4(aq)+2H2O(l)

**Math**

You invent a new system to make excellent racing tires for the Indianapolis 500/ Your tires are good for an average of 105 miles, with a standard deviation of 7.5 miles. What is the probability that one of your tires can go for at least 44 laps? What is the probability that on...

**Physics**

Assume you construct a new water tower for a town water supply. Assume the tank is in the shape of a sphere with a diameter of 21ft. Assume the tank is made of formes and welded .5 in steel plate that weighs 150 lb per ft3. What is the weight on each of the four support legs w...

**Math - Probability**

One lap is 2.5 miles. Sorry, meant to include that before.

**Chemistry**

Concentrated hydrochloric acid has a concentration of 12.1 moles per liter. how many milliliters of the concentrated acid should be used to create 3.25L of a 0.100M solution?

**Chemistry**

What volume of solution do you have if you know you dissolved 0.0500g nitric acid to make solution that was determined to be 0.0793M (molarity). My teacher gave 10.0 mL as the answer, but I got .0098. Not quite sure where I went wrong.

**physics**

To anyone else looking for this answer, I suck at physics but I'd like to point out that the book says "2.5 Watts" NOT 3.5 like Brianna has in her question and Elena has in her answer.

**English**

Where did Eva's family live in the book Uncle Tom's Cabin?

**Chemistry**

Calculate the pressure in an evacuated 250. mL container at 0.00 degrees C if 3.20 cm^3 of liquid oxygen evaporates. Assume that the liquid oxygen has a density of 1.118 g/cm^3 I understand that the density and volume can be used to find the mass in grams. However, I'm con...

**chemistry**

Thank you very much!

**chemistry**

At 0.00 degrees C a 1.00 L flask contains 5.00 x 10^-2 mol N2, 1.50 x 10^2 mg O2, and NH3 at a concentration of 5.00 x 10^18 molecules/mL. What is the partial pressure of each gas, and what is the total pressure in the flask at atm?

**Chemistry**

How many moles of a gas do you have if it is under 800.mmHg of pressure in a 500.mL flask at a temperature of 32 degrees fahrenheit?

**Geometry**

Triangle UVW is the pre-image of triangle RST with a scale factor of 3. Find the area of triangle UVW if the area of triangle RST is 9 cm2.

**Chemistry**

Given the unbalanced equation: (NH4)2 CO3-> NH3 + CO2 + H2O Calculate the mass of ammonia gas that is produced if 1.25g of ammonium carbonate decomposes completely.

**Chemistry**

Calculate how many grams of the product(s) would be produced by complete reaction of 0.125 mole of the first reactant. CaCO3 + 2HCl --> CaCl2 + CO2 + H2O

**Chemistry**

Calculate how many moles of products(s) would be produced if 0.500 mole of the first reactant were to react completely. BaCl2 + 2AgNO3 --> 2AgCl +Ba(NO3)2

**Chemistry**

Balance the equation. Cu + HNO3 --> Cu(NO3)2 + NO2 + H2O I'm having a little trouble getting this equation to balance. Thank you in advance! :)

**Chemistry**

I got 10.4g as well. My teacher must have put down the incorrect answer... thank you for your help!