Saturday
December 20, 2014

Posts by Bob


Total # Posts: 2,499

Simplifying trig expression
sin(x+90) = ? cos(x+90) = ? Would the first equal like -sin(x)? Would the second equal uh -cos(x)? I'm not quite sure :/
December 16, 2013

LCM of two numbers?
the lcm of pi/2 and pi/3 is 6?
December 15, 2013

LCM of two numbers?
lcm of two numbers pi/3 pi/2 How do I do it? Would it be pi or pi/6? Thanks
December 15, 2013

science
the honeyguide bird leading the honey badger to the bees hive, both eat meat what is the symbiosis for this
December 12, 2013

Chemistry
How many grams of K2Cr2O7 (Potassium dichromate) must be used to make 250 ml of a0.125 M solution?
December 8, 2013

business law
*The below is a scenario in which I have to make an IRAC for (not sure if you know what that is) but read the scenario and see if "Faye" is able to leave legally without ramifications. You must also list the legal rules that apply to this scenario..(for example, if ...
December 2, 2013

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

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
12
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

Physics
53
October 8, 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
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

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

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

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

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

Math
Determine the digits of Y from these clues. The digits of Y add to 18. The first digit is 3 times the third digit. The second digit is 2 times the third digit. Y is a three digit number.
June 18, 2013

Physics
Optical fibers are devices used for guiding light in many applications, most notably for fast communication. A fiber consists of a glass cylinder surrounded by a wall covered in a special coating. The fibers work on a principle called total internal reflection: light enters ...
June 18, 2013

Math
835
June 18, 2013

Math
Thanks
June 18, 2013

Math
γ is a permutation on eight elements, though you are not told which permutation it is. If γ is applied to an 8-element set, what is the minimum number of additional timeswe must apply γ to the resulting set in order to guarantee the set is back in its original ...
June 18, 2013

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