Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 3,674

**physics**

A cannon is fired horizontally from a platform . The platform rests on a flat, icy, frictionless surface. Just after the shell is fired and while it is moving through the barrel of the gun, the shell (mass 3.2 kg) has an acceleration of 12500 m/s2. At the same time, the cannon...
*September 30, 2014*

**Threading a machine**

How do you thread a sewing machine?
*September 30, 2014*

**Good Neighbor Day**

What are some ways you can be a good neighbor?
*September 30, 2014*

**stats and prob**

Consider a sequence of independent Bernoulli trials with p= 0.2 a) what is the expected number of trials to obtain the first success? for this I thought of it as geometric so 5 trials b) after the eighth success occurs, what is the expected number of trials to obtain the ninth...
*September 30, 2014*

**chemistry**

i got 6.667. what does this mean?
*September 27, 2014*

**chemistry**

an electron in n=5 emits 4052 nm to what energy level does the electron move
*September 27, 2014*

**physics**

In a TV set, an electron beam moves with horizontal velocity of 2.5 × 107 m/s across the cathode ray tube and strikes the screen, 44 cm away. The acceleration of gravity is 9.8 m/s2 . How far does the electron beam fall while traversing this distance? Answer in units of m
*September 27, 2014*

**chem**

The electron in a ground state H atom absorbs a photon of wavelength 121.57nm, to what energy level does the electron move?
*September 27, 2014*

**Chemistry of Life**

thank you!!!!!!
*September 26, 2014*

**Chemistry of Life**

Which statement is true about water molecules? The oxygen atom has a negative charge. The hydrogen atoms do not share electrons. Water molecules move randomly around each other. Water molecules cannot dissolve many substances. Question 2. How does water relate to the ability ...
*September 26, 2014*

**math**

Which equation is equivalent to 3x + y = 5? (Points : 1) y = 5 3x y = 5 + 3x y = 3x 5 y = 3x 5
*September 26, 2014*

**Algebra HELP PLEASE**

No the choices are these: (3, 11) (2, 1) (1, 3) (5, 5)
*September 26, 2014*

**Algebra HELP PLEASE**

Which is a solution to the equation y = 2x 5?
*September 26, 2014*

**physics**

if a man moving away with the speed of 0.5 of sound from a stationary sound source producing a sound of frequency , he would hear a sound of frequency
*September 25, 2014*

**trignometry**

prove that the area of any triangle XYZ is y^2*sin(x)*sin(z)/2*sin(y)
*September 25, 2014*

**trignometry**

prove that the area of any triangle XYZ is y^2*sin(x)*sin(z)/2*sin(y)
*September 25, 2014*

**Plz Hellp**

Wanda took out a personal loan for $16,000 at 9% simple interest. How much interest will she pay after 5 years? Suppose she pays off the loan in 3 years instead of 5 years. How much money will she save in interest?
*September 24, 2014*

**math**

number 1 is d and number2 is b
*September 24, 2014*

**Algebra**

Wanda took out a personal loan for $16,000 at 9% simple interest. How much interest will she pay after 5 years? Suppose she pays off the loan in 3 years instead of 5 years. How much money will she save in interest?
*September 24, 2014*

**Science**

smallest unit that consists of at least one atom A. Protons B. Neutrons C. Electrons D. Molecules Im thinking D but im not sure i don't remember.
*September 24, 2014*

**MATH-Help! **

A new set of car tires has a tread depth of 8 millileters. The tread depth decreases 0.12 millimeter per thousand miles driven. Write an equation that gives the tread depth as a function of the distance driven. Then predict what distance the tread depth will be 2 millimeters....
*September 23, 2014*

**Grammar**

1. Choose the answer that identifies the form of the verb in the sentence. Cindy is painting her room purple. present present participle past past participle Question 2. Choose the answer that identifies the tense of the verb in the sentence. Has the rain stopped yet? past ...
*September 23, 2014*

**math**

The wave heights h in the open sea depend on the speed v of the wind and the length of time t that the wind has been blowing at that speed. Values of the function h = f(v, t) are recorded in feet in the following table. the values that you need on the table are.. 20hr/30 knots...
*September 23, 2014*

**math**

a radio uses one-third the number of watts used by lamp, and a heater that uses 15 times as many watts as a lamp. when all are in use, the total electrical power is 1.1 kilowatts how many does the radio use?
*September 23, 2014*

**Chemistry**

How many carbon atoms are contained within 10.0 pounds of sugar, (sucrose) which has the formula c12h22o11?
*September 22, 2014*

**Chemistry**

Suppose a metal worker shapes a 3.4 mg piece of gold until it is a thin, perfectly square plate that is uniformly 8.6x10^-6 cm thick. What is the length of a side of the plate, in cm?
*September 22, 2014*

**Empires**

I need help to compare and contrast the Babylonian and Hittite empires
*September 22, 2014*

**geography**

How does chinas geography influence how people live in china?
*September 22, 2014*

**geography**

How did the geography of China affect the development of early civilization there?
*September 22, 2014*

**Community service**

Do you need to have hours to graduate high school?
*September 22, 2014*

**Algebra( check my answers)**

1. Juan deposited $200 in a savings account earning 3% interest over 2 years. What was the total amount of interest earned after 2 years? $12 $24 $120 ( my answer) $240 2. Mary borrowed $11,000 at 5% interest for 4 years. What was the total interest? $22 $220 $2200 (my answer...
*September 19, 2014*

**algebra **

how to write recursive formula and give one example of one
*September 18, 2014*

**World History**

Why did the Hittites and others migrate from central Asia to Mesopotamia? They needed more land for growing populations. They were enlarging their empire. The Persian army drove them out. Climate change brought a mini ice age to Asia.
*September 17, 2014*

**World History**

What was the significance of the Code of Hammurabi? The laws were developed from an ancient Sumerian code of laws. The laws were displayed throughout the empire for all to see. The laws guaranteed many freedoms for ordinary citizens. The laws guaranteed equality between the ...
*September 17, 2014*

**Sixth Grade Simplest Form**

Thank you Mia!
*September 16, 2014*

**Sixth Grade Simplest Form**

A. Oranges = 3/2 apples = 9/5 blueberries = 3/4 peaches = 2
*September 16, 2014*

**Sixth Grade Simplest Form**

Im having a hard time trying to solve this problem. Can someone please help me? Marcial found a recipe for fruit salad that he wanted to try to make for his birthday party. He decided to triple the recipe. 3 1/2 cups thinly sliced rhubarb 15 seedless grapes, halved 1/2 orange...
*September 16, 2014*

**Chemistry**

To drain a round swimming pool that is 18.0 ft wide and 3.75 ft deep, a worker uses a pump that can move 7.58 gallons of water per minute. how many minutes will it take to drain the swimming pool?
*September 16, 2014*

**Chemistry**

very helpful. Thank you
*September 16, 2014*

**Chemistry**

A runner's average stride length is 41 inches. She takes 28 strides in 10.0 seconds. How many minutes does it take her to run 5.0 km?
*September 16, 2014*

**Biology**

Explain the role of a hypothesis in a scientific investigation
*September 16, 2014*

**chem**

if 2.19e-9 mol of 176-W emits 1.07e15 beta particles in 1 hour. what is the decay constant? how do i go about doing this? i know the equation 0.693=kt(1/2) but i dont think that is helpful here
*September 16, 2014*

**Biology**

thanks
*September 16, 2014*

**Biology**

In terms of energy, what is the difference between glucose and ATP?
*September 16, 2014*

**Algebra**

thanks
*September 15, 2014*

**Algebra**

30?
*September 15, 2014*

**Algebra**

What is the solution to the proportion? 4/12=10/x x = 3 x = 3.3 x = 4.8 x = 30
*September 15, 2014*

**Physics**

I have tried this question over and over and not sure if the answer is 16 west or 190 south west please help. Airplane One flies due east at 250 km/h relative to the ground. At the same time, Airplane Two flies 325 km/h, 35° north of east relative to the ground. What is ...
*September 14, 2014*

**math**

write two ratios that are equivalent to 1:1
*September 11, 2014*

**maths**

what number makes statement true: 30=0.3
*September 11, 2014*

**ENGR**

1. Use the axioms of probability to show the following: (a) For any event E, P{Ec} = 1 − P{E}. (b) P{∅} = 0. (c) For any events E and F, if E ⊂ F, then P{E} ≤ P{F}. (d) If the events E1, E2, and E3 are mutually exclusive, then P{E1∪E2∪E3} = ...
*September 10, 2014*

**calc**

Consider the vector function given below. r(t) = 7t, 3 cos t, 3 sin t (a) Find the unit tangent and unit normal vectors T(t) and N(t). i found T(t) but I can't get N(t)
*September 10, 2014*

**chem**

if 14.66ml of a standard .2616M KOH solution reacts with 57.5ml of CH3COOH solution, what is the molarity of the acid solution?
*September 9, 2014*

**statistics**

let E,F and G be three events. state expressions fo rthe events. a. only F occurs b. exactly two of the events occur. c. at leasat one of the events occur. d. E and G occur but F does not. how do I go about writing these. do I use like union and intersection?
*September 5, 2014*

**chemistry**

how many mL or .0252M HNO3 are required to neutralize 25.00mL of .0148M of Sr(OH)2? and how did you get the answer!!!
*September 1, 2014*

**Math- urgent**

Vong grilled 21 burgers at a block party. He grilled the same number of pounds of turkey burgers as hamburgers. Each turkey burger weighed 1/4 pound and each hamburger weighed 1/3 pound. How many of each did Vong grill?
*August 27, 2014*

**Math- urgent**

Solving Systems by Substitution Maribel has $1.25 in her pocket. The money is in quarters and dimes. There are a total of 8 coins. How many quarters and dimes does Maribel have in her pocket? I think the equation is 10x+25x=$1.25 and x+x=8 but I'm not sure.
*August 27, 2014*

**math**

calculate the upper limit for the definite integral from -2 to 2. oh x^2+1 dx with the partition P=-2,-1,0,1,2
*August 22, 2014*

**English**

Is there any website that checks your punctuation and grammer?
*August 19, 2014*

**math**

5/x+7/y=31,7x+5y=29xy by comparision and subsitition method
*August 19, 2014*

**Biology**

thank you
*August 18, 2014*

**Biology**

I think D.
*August 18, 2014*

**Biology**

Sorry its, C. Humans have had no impact on the world's environment D. Humans have had a large impact on the world's environment
*August 18, 2014*

**Biology**

Thank You So Much! IS B. THE ANSWER TO THIS ONE? Which of the following statements are true? A.) Destruction of rain forests has no effect on living things. B.) Destruction of rain forests increases the rate of evolution of rain forest organisms. C.) Humans have had no impact ...
*August 18, 2014*

**Biology**

A "tree of life" explains: a. how organisms are related to each other b. how organisms differ from each other c. the lineages of various organisms. d. All of the above
*August 18, 2014*

**important math question**

I am also having trouble with this problem for a differentiable function it is known that f(3)=5 and f'(3)=-2 use differentials to get the approx. value of f(3.02)
*August 17, 2014*

**important math question**

how do you get that without using a calc?
*August 17, 2014*

**important math question**

the equation x^3 -x-5=0 has one solution for x between -2 and 2. what is the solution? how do I get this
*August 17, 2014*

**Chemistry**

A cow weighing 1317 slug can yield10% steak. Steak may contain 5.8 % fat. How many milligrams of fat can you get from 0.548 slug of steak? (1 slug = 14.59 kg) Answer in units of mg I started the conversion by converting slugs to kg, but I didn't know what to do after that...
*August 16, 2014*

**Geometry**

Draw a diagram. Triangles. AB n(upside down U) CD = CB
*August 15, 2014*

**POL201**

With unfunded mandates, the national government (Points : 1) respects state sovereignty. passes a national policy measure which will require state spending. approves a state policy measure and provides 1/3 of the required state spending. fully pays for the state spending ...
*August 4, 2014*

**pol week 2 quiz**

Really I thought it was a legislative veto I am going to have to do some more investigation
*August 4, 2014*

**pol week 2 quiz**

Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that (Points : 1) it provides the best means of developing a vast country because it allows for experimentation. it may stimulate the interest...
*August 4, 2014*

**pol week 2 quiz**

Congress controls the Executive branch by issuing (Points : 1) orders to stop what it is doing. a halt of funding for programs. a legislative veto. its authority to a different branch.
*August 4, 2014*

**pol week 2 quiz**

NOpe I have all the answers I cant seemed to fine a few of them
*August 4, 2014*

**pol week 2 quiz**

The basis for national power lies in (Points : 1) the Interstate Commerce Clause only. the Supremacy Clause and the Treaty Clause only. the Treaty Clause and the Interstate Clause only. the Interstate Commerce, Supremacy, and Treaty Clauses. Question 2. 2. In Cooperative ...
*August 4, 2014*

**math**

find the volume of the solid obtained by rotating the region bounded by the given curves about the specified line. x=2=2sqrty, x=0, y=9 about the y axis. Is this the disk or shells method and how do I set this problem up?
*August 4, 2014*

**physics-please help**

is the answer in T? I had 9.3568E-26 and it says the answer is wrong
*August 4, 2014*

**physics-please help**

A proton, traveling with a velocity of 6.8 × 106 m/s due east, experiences a magnetic force that has a maximum magnitude of 8.6 × 10-14 N and direction of due south. What are the magnitude and direction of the magnetic field causing the force? If the field is up, ...
*August 4, 2014*

**math**

find teh volume of the solid by rotating y=1-x^2, y=0 around the xaxis
*August 3, 2014*

**science**

The angular velocity, after the collision, is smaller. The total angular momentum of the system is constant. The angular velocity, after the collision, is the same. The angular velocity, after the collision, is larger. The kinetic energy of the system is constant. The total ...
*August 1, 2014*

**science**

Consider a rotating platform such as you used in lab. Imagine that it is initially rotating at some angular velocity. You drop a disk, that is not rotating, onto the top of the rotating platform so that it sticks to the rotating platform and begins rotating along with the ...
*August 1, 2014*

**POL201 **

A policy area in the middle of these cross-currents is elementary and secondary education – a subject traditionally under local control, with some oversight by the states. However, during the last four decades – especially since 2001 – the national government&#...
*August 1, 2014*

**physics**

A string is wrapped around a uniform disk of mass M = 1.6 kg and radius R = 0.10 m. (Recall that the moment of inertia of a uniform disk is (1/2)MR2.) Attached to the disk are four low-mass rods of radius b = 0.17 m, each with a small mass m = 0.6 kg at the end. The device is ...
*July 31, 2014*

**sciecne**

A space station has the form of a hoop of radius R = 15 m, with mass M = 6000 kg. Initially its center of mass is not moving, but it is spinning slowly with angular speed ù0 = 0.0018 radians/s.Then a small package of mass m = 5 kg is thrown by a spring-loaded gun toward...
*July 30, 2014*

**math**

thanks. so how woudl i find For which values of t is the curve concave upward?
*July 28, 2014*

**math**

Find dy/dx and d2y/dx2. x = et, y = te−t
*July 28, 2014*

**POL 201**

Well, you were correct I just got the grade back as that being correct I still did miss 2 others but I will not forget the correct answers next time. Thanks again
*July 26, 2014*

**POL 201**

Thank you so much, in my reading in my text I couldn't find anything about becoming corrupt.
*July 26, 2014*

**POL 201**

Those who attended the Constitutional Convention believed that (Points : 1) England was an evil society. America had made a great mistake in fighting the revolutionary war. British institutions of government were good but they became corrupt. America would only achieve ...
*July 26, 2014*

**science**

I thought you just do 7(20)+(5)10
*July 24, 2014*

**science**

thanks, can you help me with this one What is the angular momentum A if A = <7, 5, 0> m and = <-20, 10, 0> kg·m/s?
*July 24, 2014*

**science**

You know that a collision must be "elastic" if: The momentum of the two-object system doesn't change The sum of the final kinetic energies equals the sum of the initial kinetic energies There is no change in the internal energies of the objects (thermal energy, ...
*July 24, 2014*

**science**

A hoop of mass M = 4 kg and radius R = 0.4 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
*July 21, 2014*

**math**

what is the radius of convergence for the sum n=1 to infinity of 3(-1)^n(n)(x^n)?
*July 21, 2014*

**science**

does density affect weight?
*July 19, 2014*

**Math**

I don't know how to explain c. I know the next 3 terms is -19,-27,-36
*July 14, 2014*

**Math**

Continue the pattern for three more terms. Describe how to find the successive terms. a)12,9,6,3 b)5,6,8,11 c)3,-1,-6,-12 Please help
*July 14, 2014*

**Science**

Make a flowchart to show how the event m might affect a forest ecosystem. A logging company clear-cuts the trees in the forest. My question is; What are the events that might affect a forest ecosystem when clear-cutting the trees in the forest?
*July 10, 2014*

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