Thursday
July 30, 2015

Posts by george


Total # Posts: 942

Physics
Calculate the force of gravity between a human child (mass = 38 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its closest to Earth (distance = 8. 1010 m).
April 10, 2013

Math
If a salesman sold 2 cars in his first month, 8 cars in his second month, and 32 cars in his third month, using the same sequence how many cars would he sell in month 4, month 5, and month 6
April 3, 2013

Chemistry
How many moles of H2O are produced when 6 moles of o2 is consumed in burning meyhyl Alchohol
April 1, 2013

math
A FARMER BUILT A PEN FOR HIS FAVORITE PIG. THE PEN SHOWN BELOW HAS AN AREA OF 50 SQUARE FEET.THE PEN IS TWICE AS WIDE AS IT IS LONG AND HAS A PERIMETER OF 30 FEET. WHAT IS THE LENGTH, IN FEET OF THE PEN.
March 27, 2013

Physics
A certain car is capable only of accelerat ing at 3.0m/s 2 , braking (decelerating) at 5.0m/s 2 , and moving at constant velocity. The car is init ially located 100m from a road sign. The driver, starting from rest, begins to accelerat e towards the sign. After maintaining ...
March 20, 2013

Chem
How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?
March 19, 2013

accounting
Normal price of mini-scooters are $120 per scooters, ABC estimates 400,000 scooters to be sold for Year 2013. Material costs are $20,0000 per year to produce these scooters. Variable costs are $10.00/per mile delivery and $50.00/scooter for handling charges. ABC is approached ...
March 16, 2013

accounting
Normal price of mini-scooters are $120 per scooters, ABC estimates 400,000 scooters to be sold for Year 2013. Material costs are $20,0000 per year to produce these scooters. Variable costs are $10.00/per mile delivery and $50.00/scooter for handling charges. ABC is approached ...
March 16, 2013

physics
What would the gravitational potential energy be if the bucket were raised six times as high?
March 11, 2013

physics
If you do 110 J of work to elevate a bucket of water, how much energy did you add to the gravitational field?
March 11, 2013

physics
A boulder is raised above the ground so that the gravitational potential energy relative to the ground is 360 J. Then it is dropped. What is its kinetic energy just before it hits the ground?
March 11, 2013

physics
Calculate the work done when a 18 N force pushes a cart 2.5 m.
March 11, 2013

Chemistry
What is the pH of a 0.77M solution of methylamin at 25 degree C? CH3NH2, Kb= 4.4X10-4? How do I set this up to get the answer?
March 7, 2013

maths
find the first 3 terms in the expansion of (x+4)(1+3x)^-2 as a series in ascending powers. I expanded the second bracket using binomial expansion and got 1 -6x +27x^2 -108x^3 how do I combine (x+4) with the expansion? Any help would be appreciated.
March 3, 2013

algebra
X= log base 3 1/27
March 1, 2013

Science
What is the momentum of a 50 kg carton that slides at 2 m/s across an icy surface? The sliding carton skids onto a rough surface and stops in 3 s. Calculate the force of friction it encounters.
February 26, 2013

science
A car with a mass of 700 kg moves at 18 m/s. What braking force is needed to bring the car to a halt in 10 s?
February 25, 2013

physics
In terms of impulse and momentum, why are airbags in automobiles a good idea? A.)Airbags actually do not help if a car is in an accident. B.)They increase the amount of force involved in a collision. C.)They decrease the amount of time for a collision to happen. D.)They ...
February 25, 2013

Math
sorry i meant u too jj
February 21, 2013

Math
you too knight
February 21, 2013

Math
thx
February 21, 2013

Math
The eggplant ave. bus passes max's house every 8 mins. the cabb creek bus passes it every 12 mins. the last they passed by together was at 9:00 am. when will it happen again
February 21, 2013

Algerbra
HELP!!!!!!! I have to find a rule for the following in and out. Input: 1,2,3,4 Output: 3,9,18,30
February 19, 2013

Chemistry
Chromatography relies on the differences in polarity between the compound, the mobile phase and the stationary phase. In your own words explain how polar and non-polar compounds can be separated using cellulose paper and petroleum ether. I have no idea
February 13, 2013

physics
I know this seems like a silly question but our professor said we should be getting a very small value that will not even make a substantial difference. It is a poorly thought out problem. Yes y/x = 13/125. That's all I can really help with. Sorry :( Thank you for your ...
February 7, 2013

physics
If the car has a mass of 0.4 kg, the ratio of height to width of the ramp is 13/125, the initial displacement is 1.9 m, and the change in momentum is 0.87 kg*m/s, how far will it coast back up the ramp before changing directions? tinypic(dot)com(slant)r(slant)10dunx3/7 I get ....
February 7, 2013

physics
A 52.5g super ball traveling at 28.0m/s bounces off a brick wall and rebounds at 18.5m/s. A high speed camera records this event. If the ball is in contact with the wall for 4.10ms, what is the magnitude of the average acceleration of the ball during this time interval?
February 4, 2013

physics
A car starts from rest and travels for 6.0s with a uniform acceleration of 2.7m/s ^2. The driver then applies the brakes, causing a uniform acceleration of -2.0m/s^2. If the brakes are applied for 2.0s, determine each of the following. a.) how fast is the car going at the end ...
February 4, 2013

physics
A person driving her car at 56km/hr approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 20.s before turning to red, and she is 30m away from the near side of the intersection. The intersection is 15m wide. Her car's...
February 4, 2013

physics
In a test run, a certain car accelerates uniformly from zero to 17 m/s in 2.95s. a.) what is the magnitude of the car's acceleration? b.) how long does it take the car to change it's speed from 8.5m/s to 17m/s? c.) will doubling the time always double the change in speed?
February 3, 2013

physics
The cheetah can reach a top speed of 114km/h (71mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50m in a straight line reaching a final speed of 91 km/h. a.) Determine the cheetah's average acceleration during the short sprint. b.) Find...
February 3, 2013

Physics?
the total mass-energy of one pound of anything is about how many joules
January 31, 2013

physics
A hiker starts at his camp and moves the following distances while exploring his surroundings: 70.0m north, 2.75 x 10^2m east, 130m at an angle 30.0 degrees north of east, and 1.50 x 10^2m south. a.) find his resultant displacement from camp. (take east as the positive x-...
January 30, 2013

physics
For 3 vectors, find the magnitude and direction of the vector D=A-B+3C. A of length 6.2 and pointing 52 degrees up from the negative x-axis B of length 6.6 and pointing 27 degrees up from the positive x-axis C of length 2.8 and pointing 57 degrees down from the positive x-axis...
January 30, 2013

Math
Test Axioms, What are the diagonals of a rectangle?
January 28, 2013

Math
negative exponents 16^-3/4?
January 28, 2013

Math
Rational exponents 8^2/3?
January 28, 2013

physics
A force Farrowbold1 of magnitude 5.00 units acts on an object at the origin in a direction θ = 34.0° above the positive x-axis. (See the figure below.) A second force Farrowbold2 of magnitude 5.00 units acts on the object in the direction of the positive y-axis. Find ...
January 28, 2013

physics
A man in a maze makes 3 consecutive displacements. His first displacement is 5.40m westward, and the second is 18.0m northward. At the end of his displacement he is back to where he started. Use the graphical method to find the magnitude and direction of his third displacement.
January 28, 2013

Physics
A baseball is dropped from a tall building and takes 4.1 seconds to hit the ground. From what height was the ball dropped?
January 27, 2013

Precalculus
I asked this yesterday but I was told my answer was incorrect by my professor. ln x^5 - ln x^2 = 3 solve for the unknown. I have reviewed my Log laws but yet I still cannot figure out what the answers are. The question asks for me to write all answers as a comma separated list...
January 24, 2013

math
how do you make a model for 1/3 times 18
January 23, 2013

Trigonometry
Thank you STEVE!!!!! Suppose that Cos (theta) = 1/square root 2 if 0<equal to theta , pi/2 then sin(theta) = tan (theta) = If 3pi/2 less than equal to theta , 2pi then sin(theta) = tan (theta) = I know the trig functions but I feel like I am missing something here. cos (...
January 23, 2013

Logarithms
lnx^5 - lnx^2 = 3 solve for the unknowns as a list. I tried using my calculator but apparently my answer is opposite ends of the universe
January 23, 2013

chemistry
how to calculate the mass of hydrogen in 150.0 g of ethene
January 22, 2013

statistics/probability
The supply office for a large construction firm has three welding units of Brand A and three welding units that are not Brand A in stock. If a welding unit is requested, the probability is .7 that the request will be for Brand A. Find the probability that exactly one of the ...
January 14, 2013

trigonometry
14. Solve sin 2x + sin x = 0 for 0 ≤ x ≤ 2π. 21. Write 2sin37°sin26° as a sum (or difference).
January 1, 2013

physics
moving car runs into stationary car, (against a wall)car does not move, however, the wall push back cancelling the force. Explain Newton's law that apply. Thanks, George
December 22, 2012

algebra
The sum of two numbers is 56. the larger number is 7 less than 3 times the smaller number. Find the smaller number.
December 19, 2012

algebra
-1
December 10, 2012

Pre-Calculus
Thank You!
November 18, 2012

Pre-Calculus
Convert the equation y=5 to polar form.
November 18, 2012

engineering
a bolt located 50mm from the center of an auto wheel is tightened by the couple shown for .10 seconds. determine the resulting angular velocity of the wheel if the wheel has a radius of gyration of 250 mm and a mass of 19 kilograms
November 17, 2012

Math
Michaels car has a 18.0 gallon tank. If the tank has 5.5 gallons what fraction of the tank is full?
November 14, 2012

Precalc
Prove or disprove the following identity. cos(-x) - sin(-x) = cos(x) + sin(x)
November 13, 2012

Precalculus
rewrite the following expression as an algebraic expression in x: cos(arcsin x) I have made X to be X/1 but from there I am lost.
November 12, 2012

Precalculus
what is the arccos(2)? I have tried to use the unit circle but I do not understand this :/.
November 12, 2012

Math
5p+2q=3 7p+2q=11
November 7, 2012

ENGLISH LIT
The theme of the book "Tolstoy" the death of ivan ilyich. i read the book but i don't get the theme.
November 6, 2012

Social Studies
Yes, Here are my answers, please check them. 1. C - many different goods or services for sale in a market 2. B - lower prices and more choices for buyers. 3. D $199 4. C -price 5. A - a clearance sale
November 2, 2012

Social Studies
I am having a hard time with economics - we just started in my social studies class. Can I have help with my homework, please? 1. What phrase best defines competition? (1 point) just one main buyer of a good or service just one main seller of a good or service many different ...
November 2, 2012

Math
Thank you.
November 1, 2012

Math
After a reflection over the x-axis I have to find the coordinates of A1, B1, C1 I am having trouble with b1. A(1,4) B(3,-2) C(4,2) The reflection should be: A1 should be (1,-4) B1 ?????? C1 should be (4,-2) Can younhelp with the b1 coordinates and check my other coordinates too?
November 1, 2012

psych
Alfred Binet's work is associated with intelligence testing visual perception psychopathology comparative psychology classical conditioning
November 1, 2012

Precalculus Follow Up 2
Oh now I see your point. I am sorry I should have stated this before. How do I verify that tan^2(theta)/Sec(theta)-1 is somehow the same as 1+cos(theta)/Cos(Theta)?
October 29, 2012

Precalculus Follow Up
1+ cos(theta)/Cos(theta) = tan^2(theta)/sec(theta)-1 I am having trouble understanding how this is verified by the previous answer. I am sorry I just want to understand this because I didn't see a tan^2 anywhere :/. Step by step how did you verify the above identity? Please?
October 29, 2012

Precalculus
I have been trying to verify the below identity. I have been at it for hours, can anyone please help? 1+ cos(theta)/Cos(theta) = tan^2(theta)/sec(theta)-1
October 29, 2012

physics
A 50 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 3.7 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40. An 80 kg block is suspended from the top rung of the ladder, just at the wall...
October 29, 2012

Physics
What force do the blades of a 4200 kg helicopter exert on the air when the helicopter is dropping at 23 m/s with speed decreasing at 3.7 m/s^2?
October 26, 2012

Math
What is the volume in cubic feet, of a box that is 3ft long, 8th wide, and 16ft high?
October 22, 2012

Physics(please bobpursley)
A girl coasts down a hill on a sled, reaching level ground at the bottom with a speed of 6.7 m/s. The coefficient of kinetic friction between the sled’s runners and the hard, icy snow is 0.048, and the girl and sled together weigh 615N. The acceleration of gravity is...
October 21, 2012

physics
block A (mass 2.04kg) rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block B (mass 3.00kg ). The coefficient of kinetic friction between block A and the tabletop is 0.215. After the blocks are released from ...
October 11, 2012

Stats
Calculate the expected value and standard deviation of X, the number of on the job accidents: Accidents 0,1 2 Probability .5, ?, .2 P(X=1) = E(x) = µx = Standard deviation =
October 11, 2012

Stats
Let Y be a random number between 0 and 1 produced by the idealized uniform random number generator with density curve pictured in the following figure: P(<Y<0.4) = P(0.4<Y<1) = P(0.3<Y<0.5)+
October 11, 2012

Trigonomety question
How do you find the exact value of Sin(13pi)?
October 8, 2012

Chemistry
A compound Contains 14.5g of magnesium and 3.5 g of oxygen. what the mass of oxygen in the compound ?
October 5, 2012

Algebra
How did you arrive at that answer?
October 3, 2012

Algebra
A bean sprout grows 3 inches in its first week, 2 inches in its second week, and 1.333 inches in its third week. If the sprout's growth follows this pattern, how much will the bean sprout have grown in its fourth week?
October 3, 2012

science
The universal wave equation states that v = fë, therefore wavelength is directly related to the speed of the wave. That means that if the frequency is increased, the speed is also increased and vice versa, as long as frequency is kept constant.
October 3, 2012

math
2x+x=72 3x=72 x=24 2x=48 The two lengths of rope are 24 and 48 inches
October 3, 2012

Precalc/Trig
wave is modeled by the function ... h(t) = 3cos(p/10)*t What is the period of the wave (T) *frequency (F) is defined as the number of cycles of the motion per second. What is the relationship between F and T? Find the wave height (H) which is the vertical distance between the ...
September 26, 2012

math
I agree with Ms. Sue, Sneha, and pete
September 24, 2012

Physics
A child’s toy consists of plastic attached to a spring. The spring is compressed against the floor a distance of 1.48 cm, and the toy is released. The acceleration of gravity is 9.8 m/s2 . If the toy has a mass of 109 g and rises to a maximum height of 58.7 cm, estimate ...
September 19, 2012

Chemistry
My question is 'what does the area under the curve represent?' it's a Maxwell-Boltzmann curve. My first idea was the number of particles but that's just what the y axis says and surely that wouldn't just mean under the curve. My second idea was to write ...
September 16, 2012

physics
, block A (mass 2.04)kg rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block B (mass 3.00 )kg. The coefficient of kinetic friction between block A and the tabletop is 0.215. After the blocks are released from ...
September 12, 2012

physics
The highest George can suck water up a very long straw is 2.0m What is the lowest pressure he can maintain in his mouth? Express to two sig figs
September 7, 2012

Math
Sam has a savings account that increased in value over 12 month period from $8765.00 to $9006.04. He made no deposits or withdrawals in that time. What annual percent interest did he receive for the 12 month period?
August 20, 2012

math
determine the domain and range for the function f(x,y)=Sq.Rt. 1-x*2-y*2
August 14, 2012

physics
An aircraft is flying at the speed of 354km/hr relative to the air is observed from the ground to have a velocity of 300km/hr in the north east direction. The wind is blowing from east. Find the speed of the wind and the direction to which the aircraft is heading.
August 10, 2012

home
how many grams of lead are in a 3/4 inch ball of lead
July 6, 2012

physics
What is the moment of inertia of a solid cylinder of radius R=0.9550m,thickness t= 0.015m, and total mass M= 3.565 kg?
June 12, 2012

math
36x3.14x8=?
June 6, 2012

MATH
5.3
May 29, 2012

chemistry
Current is applied to a molten mixture of CuF, ZnCl2, and AlBr3. What is produced at the cathode? a)F2 b)Al c)Cu d)Zn e)Cl2 f)Br2 What is produced at the anode? Same options as above.
May 29, 2012

Geometry
2.36 gallons. Correct?
May 7, 2012

Geometry
A flush tank on a toilet is rectangular with dimensions of 21 inches by 6.5 inches and contain water to a depth of 12 inches. How many gallons of water per flush will be saved if the depth of the water is reduced by one-third? 231 cubic inches per gallon)
May 7, 2012

Chemistry
The volume of a gas is 250 mL at 340.0 kPa pressure. What will the volume be when the pressure is reduced to 50.0 kPa, assuming the temperature remains constant?
May 6, 2012

Calculus I
At time t in seconds, a particle's distance s(t), in centimeters, from a point is given by s(t) = 4 + 3 sin t. What is the average velocity of the particle from t = pi/3 to t = 7pi/3?
May 6, 2012

Calculus I
At time t in seconds, a particle's distance s(t), in centimeters, from a point is given by s(t) = 4 + 3 sin t. What is the average velocity of the particle from t = ð/3 to t = 7ð/3?
May 6, 2012

Wastewater treatment
What is the molarity of 24.5 grams of sulfuric acid dissolved in a liter of water?
May 4, 2012

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