Wednesday

July 27, 2016
Total # Posts: 3,009

**physics**

A certain elevator car has mass 2200 kg and is lifted by cables driven by an electric motor. The efficiency of the lift system (motor, pulleys, cable, etc.) is 67.0%. As the elevator car moves at constant speed of 3.0 m/s it encounters 220N of friction coming from its tracks. ...
*December 1, 2013*

**physics**

A steel section of the Alaskan pipeline had a length of 65.1 m and a temperature of 15.8 °C when it was installed. What is its change in length when the temperature drops to a frigid -31.2 °C?
*November 30, 2013*

**poetry**

Could you help me answer these questions using William Cullen Bryant's poem, "The Prairies?" Thank you so much! I've attached a link to the poem. The poem text is widely available online if you just google the title/author Here are the questions I am ...
*November 27, 2013*

**math**

what would be an example of a parameter? i'm confused. i'm given this problem: How much time do undergraduate students at GMU spend each day reading and sending email? A survey was conducted by a graduate student asking students in the Johnson Center the above question...
*November 24, 2013*

**Trigonometry **

Hey
*November 24, 2013*

**math**

ITS 40 TONNES
*November 22, 2013*

**Physics HELP!!**

A gyroscope consists of a uniform disc of mass radius M= 1 kg and radius R= 0.3 m . The disc spins with an angular speed ω= 200 rad⋅s-1 as shown in the figure below. The gyroscope precesses, with its axle at an angle 30∘ below the horizontal (see figure). The ...
*November 20, 2013*

**Physics**

A woman on a bridge 75.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 7.00m more to travel before passing under the bridge. The stone hits the water 4.00m ...
*November 19, 2013*

**Algebra**

poop
*November 17, 2013*

**math**

Sheila is going to divide a 36-inch piece of ribbon into 5 equal pieces.She says each piece will be 7 inches long.whats the error?
*November 12, 2013*

**Physics**

A coin rests 18.0 cm from the center of a turntable. The coefficient of static friction between the coin and turntable surface is 0.390. The turntable starts from rest at t = 0 and rotates with a constant angular acceleration of 0.850 rad/s2. (b) At what angular speed (ω...
*November 12, 2013*

**Physics**

A ball is thrown horizontally from the top of a building 45.2 m high. The ball strikes the ground at a point 78.9 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 . Find the time the ball is in motion, initial velocity, and x and y components
*November 10, 2013*

**Physics**

Tom the cat is chasing Jerry the mouse across a table surface 2.4 m oﬀ the ﬂoor. Jerry steps out of the way at the last second, and Tom slides oﬀ the edge of the table at a speed of 4.8 m/s. Where will Tom strike the ﬂoor? The acceleration of ...
*November 10, 2013*

**science**

Well since one says gravity and the other says intertia... They both have a good reason to be the answer so I would say both intertia and gravity
*November 10, 2013*

**science**

inertia
*November 10, 2013*

**C++**

True or false: A function call statement transfers control of the program to the last statement in the body of a function.
*November 8, 2013*

**physics**

Net force F causes mass m1 to accelerate at rate a. A net force of 3F causes mass m2 to accelerate at rate 2a. What is the ratio of mass m1 to mass m2?
*November 5, 2013*

**music history**

I need an example thesis for a research paper. It can be about pretty much any music as long as its before 1750. (pretty much everything from Ancient Music - The Baroque period). Thanks in advance!
*November 4, 2013*

**algebra**

How do i solve an equation when there is a variable on both side of = and the two constants are equal x-16 = 16-2x 7-2x = 2x-7 The answer in both cases seems to = 0
*October 30, 2013*

**science**

A hockey puck sliding on a frozen lake comes to rest after traveling 272 m. If its initial velocity is 3 m/s, what is its acceleration (assumed constant)? Answer in units of m/s2
*October 29, 2013*

**MATH _ RE-POST PLEASE HELP**

I dont' know
*October 27, 2013*

**Computer Programming using python**

def test(): index = 1 prev_index = 0 count = 0 global largest largest = '' test = s[prev_index] while count < len(s): if ord(s[index]) > ord(s[prev_index]): test += s[index] index += 1 prev_index += 1 elif ord(s[index]) == ord(s[prev_index]): test += s[index] ...
*October 24, 2013*

**Chemistry**

When 1.00 kg lead (specific heat = 0.13 J g -1 C -) at 100.0 C is added to a quantity of water at 28.5C, the final temperature of the lead-water mixture is 35.2 C. What is the mass of water present?
*October 21, 2013*

**Chemistry**

How much heat, in kilojoules (kJ), is required to raise the temperature of 2.50kg Hg(l) from -20.0 to -6.0C? Assume a density of 13.6g/ml and a molar heat capacity of 28.0 J mol -1 C -1 for Hg(l). Please helpppppp .... thanks in advance
*October 21, 2013*

**MATH MS.SUE HELP PLEASE!**

idk how to tag so maybe this might tag Ms. Sue here.
*October 18, 2013*

**MATH MS.SUE HELP PLEASE!**

Could somebody help me I don't understand any of this. Could someone show me or tell me how to work the problems? 1. Find the length of the hypotenuse of a right triangle with the legs of 9cm and 12cm A.8 B.21 C.15 D.225 2.The length of a hypotenuse of a right triangle is ...
*October 18, 2013*

**Math - Trigonometry**

Well think about it. The period of cos(x) is 2pi, 114pi = 358.14, so cos(x) repeats 114/2 = 57 times. So the answer is 57*2 = 144, but since cosine is split over y axis on the first period (calculatorsoup dot com/images/trig_plots/graph_cos_pi.gif) we add 1 to 144, and get 145.
*October 15, 2013*

**Math**

Oh, and 10/9 is the same thing as 1 1/9, so you were right.
*October 13, 2013*

**Math**

3^0+3^(-2) = 1 + 1/9 = 9/9 + 1/9 = 10/9 = 1.1111111...
*October 13, 2013*

**science**

what is a catalyst converter
*October 13, 2013*

**Algebra**

Never mind, I got it.
*October 13, 2013*

**Algebra**

Is the Riemann Hypothesis correct? Why or why not? Please show your work.
*October 13, 2013*

**Math**

Find the length of the arc (sector question) Radius=8cm Angle=27
*October 7, 2013*

**math**

Determine the vertex and the axis of symmetry for the function below: y=-4x^2-24x-36
*October 7, 2013*

**math**

I also need to know the answer of this work sheet P.S. Teachers this is a site for students. Please don't be pedantic and go away from the site.
*October 6, 2013*

**math**

A quadrant has an area of 175m2. Find the length of its base
*October 6, 2013*

**Physics**

A rocket moves upward, starting from rest with an acceleration of 28.1 m/s2 for 5.21 s. It runs out of fuel at the end of the 5.21 s, but does not stop. How high does it rise above the ground?
*October 5, 2013*

**Math**

I checked the question again but that is all it wrote
*October 5, 2013*

**Math**

In one revolution a wheel moves forward a distance equal to its circumference. This is because the wheel Always in contact with the floor. 1)A trundle wheel clicks everytime. What is the radius of the wheel
*October 5, 2013*

**Math**

The diameter of a bicycle wheel is 65 cm How many revolutions are needed to make the bike travel 2km
*October 5, 2013*

**Math**

Then would the answer be 43.98???
*October 5, 2013*

**Math**

A running track has 8 lanes each a meter wide.Each"straight" is 100 meters long. The distance around the track for someone running in the middle of the inside lane is 400 meters. What is the distance around the track for someone running in the middle of the outside ...
*October 5, 2013*

**business**

The type of accounting concerned with providing information and analyses to managers within the organization is referred to as
*October 3, 2013*

**Anatomy**

Because
*October 3, 2013*

**adv algebra hw**

Let x,y,z be positive real numbers such that: xyz=945 x(y+1)+y(z+1)+z(x+1)=385. What is the minimum possible value of z+y/2+x/4?
*October 1, 2013*

**Astronomy**

This is part of Coursera class final exam (From the Big Bang to Dark Energy by Hitoshi Murayama). I think it's OK to learn about the Higgs via lectures or web searches. But asking for folk to answer the question is cheating.
*October 1, 2013*

**science **

What is a possible hypothesis that could be tested in the Atomic Theory lab?
*September 30, 2013*

**delftx**

For Question 1: 2440 Total PV output = 1000W/m2×18%×10m2=1800W PV module costs = 1800W×€0.8/Wp=€1440. Non-modular costs = €100/m2×10m2=€1000. Total cost = PV module costs + non-modular costs = €2440.
*September 29, 2013*

**chem**

How many grams of NH3 are required to make 52.7g H2O in the following reaction : 4NH3+6NO->5N2+6H2O
*September 28, 2013*

**chem**

Correction!! in the question its **12CO2**
*September 28, 2013*

**chem**

Help a brother out!!! please!!!Nitroglycerin, C3H5N3O9 decomposes to form N2,CO2,H2O, and O2 4(C3H5N3O9)-> 6N2+12O2+10H20+O2 a)How many grams of water would be produced if 75g of nitroglycerin decompose? b)The creation of 3.89 moles of C02 would require how many grams of ...
*September 28, 2013*

**us history**

Compare and contrast the goasl and strategies of the Reconstruction of TWO of the following -President -Lincon -Johnson -Congressional Republicans
*September 26, 2013*

**us history**

Describe the long-term political and economic effects of the Reconstruction and southern reaction on African Americans
*September 26, 2013*

**us history**

Explain whether slavery or representation was the main cause of disunion. You may incorporate two of the following to support your answer -The Missouri Compromise -The Free-Soil Movement -Compromise of 1850 -Kansas-Nebraska Act, 1854 -Bleeding Kansas Dred Scott v. Sandford
*September 26, 2013*

**us history**

Analyze the ways that the Free-Soil movement influenced U.S politics from 1820-1860. Explain the significance of this movement.
*September 26, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

**physics**

if you are stuck in the middle of a frictionless frozen lake with only your backpack, how can you get back safely to solid ground?
*September 25, 2013*

**geometry**

15
*September 23, 2013*

**Biology**

False
*September 21, 2013*

**computers**

Networks are often set up in the client/server network arrangement. Raheem has learned that this is a very common type of network arrangement. Discuss two things that Raheem should be concerned with if he decided upon a client/server network arrangement?
*September 18, 2013*

**Algebra**

It was such a vile inn
*September 17, 2013*

**Statistics**

don't know
*September 14, 2013*

**geometry**

If BC = 16 and AC = 29, find AB.
*September 11, 2013*

**mitx 8.01x Classical Mechanics**

4.981
*September 10, 2013*

**college math**

lol this isn't "college math"; but the answer otherwise is 63+6 because(-9)(-7)=63
*September 8, 2013*

**college math**

answer is -25
*September 8, 2013*

**Math**

Alright I got it thanks so much!!
*September 8, 2013*

**Math**

Okay, I'm in a calculus class but stuck on some algebra...it's not crucial that I get the answer to this but I'm wracking my brain because I can't remember how the following is obtained; if you can show me how this is done in steps I'd greatly appreciate it...
*September 8, 2013*

**Statistics / Business**

According to the National Humane Society, "Stray Cost" or the cost of the care and feeding for a stray dog is $419.00 per year. This amount does not include veterinarian care, but only food, water and shelter. It was found that the standard deviation of this "...
*September 8, 2013*

**law**

Yes there are some issues
*September 7, 2013*

**computer science**

Write the " 7−2" expression so that no answer includes negative exponents. Assume the variables are nonzero
*September 6, 2013*

**main ideas**

Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere ...
*September 6, 2013*

**algebra 1**

the monkey stole my banana
*September 6, 2013*

**Geography**

i don't know look it up dude or dudette
*September 5, 2013*

**Math**

Hi I'm Bob
*September 3, 2013*

**chemistry**

4.0*10^-6
*September 1, 2013*

**Health**

what is it
*August 22, 2013*

**PSP**

The sentence "P ¨ Q" is read as (Points : 1) P or Q P and Q If P then Q Q if and only
*August 21, 2013*

**math**

Find the remainder when 33! is divided by 37. Please give full solution.
*August 12, 2013*

**eng**

Imagine that there is a fire in your house or apartment, and you only have 5 minutes to grab your possessions and get out. Everything you leave behind will be destroyed. What would you grab? Why? When you think about what you left behind, are you sad that you lost it or happy ...
*August 9, 2013*

**statistic**

A die is rolled 600 times. The face with six spots appears 112 times. Is the die biased towards that face, or is this just chance variation? The null hypothesis is: he null hypothesis is The die is biased towards the face with six spots. The chance that the face with six spots...
*July 31, 2013*

**problem solving**

How much space does the dining area take up? 100 guests, each guest requires 3m2 in the dining area, the average mass of each guest is 65 kg, and the average density of the dining area is 10kg/m2 How I can resolve this problem?
*July 28, 2013*

**problem solving**

100 guests each guest needs 3 m2 of space average density of the area is 10kg/m2. how much space does the dining room take up?
*July 28, 2013*

**Physics (help steve)**

A thin aluminum ring hangs vertically from a torsion spring. A torsion spring when twisted exerts a restoring torque given by τ=−κθ where θ is the angle of twist. Suppose that the ring undergoes small torsional oscillations while it is being cooled ...
*July 5, 2013*

**physics**

In the following figure m_1 = 20.0kg kg and á alpha = 50.9 ∘ ^\circ. The coefficient of kinetic friction between the block and the incline is ì k = 0.40 What must be the mass m 2 of the hanging block if it is to descend 9.00m m in the first 3.00s s after ...
*July 4, 2013*

**Math (please help steve)**

The Chicago Art Museum's Renaissance display consists of four hallways bordered around a square courtyard. A single guard is assigned to patrol the four hallways. When the guard starts working, he begins in one of the corners and walks clockwise. When he arrives at a ...
*July 1, 2013*

**Calculus (help steve)**

But thanks for all the help.
*June 28, 2013*

**Calculus (help steve)**

It's not right either. I know, I'm stumped too.
*June 28, 2013*

**Calculus (help steve)**

Thanks Steve. But apparently, that's not the right answer, since a and b are not local minimum and maximum values.
*June 28, 2013*

**Calculus (help steve)**

f(x)=−8x^3+6ax^2−3bx+4 has a local minimum at x=1 and a local maximum at x=3. If a and b are the local minimum and maximum, respectively, what is the absolute value of a+b?
*June 28, 2013*

**Math (Limits)**

(1,0) is a point on the parabola y=2x(x−1). From point A, point P is moving along the curve towards the origin O(0,0). As P→O, sec^2∠APO→N, where N is a positive integer. What is the value of N?
*June 27, 2013*

**Math (Calculus)**

A(1,0) is a point on the parabola y=2x(x−1). From point A, point P is moving along the curve towards the origin O(0,0). As P → O, sec^2∠APO → N, where N is a positive integer. What is the value of N?
*June 27, 2013*

**Physic**

please check your question, kinetic energy is not measured in kg, it's measured in joules
*June 27, 2013*

**physics**

1/2mv^2=1/2(8)(12)^2=576
*June 27, 2013*

**math**

Anne wants to tie a support line from the top of a 50 foot radio tower to an anchor spot 30 feet from the tower’s base. Approximately how long will the line need to be?
*June 20, 2013*