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April 21, 2015

Posts by D


Total # Posts: 334

Math
-5 over 8 times -3
November 29, 2012

Math
10x and 45x to the power of 4
November 29, 2012

chemistry
Rate Constant * Concentration^2
November 29, 2012

chemistry
Rate Constant * Concentration^2
November 29, 2012

Chemistry
thanks
November 29, 2012

Chemistry
Rate Constant * Concentration^2
November 29, 2012

Chemistry
it is wrong
November 29, 2012

Chemistry
thanks
November 24, 2012

Chemistry
Thanks
November 24, 2012

Chemistry
thanks
November 22, 2012

Chemistry
thanks
November 22, 2012

Chemistry
thanks
November 22, 2012

Chemistry
thanks
November 22, 2012

Physics
What is the max speed a car can go on a race track with a radius of 80 meters, the coefficient of friction between the tires and the road is .30
November 19, 2012

Physics
A baseball (m = 135 g) approaches a bat horizontally at a speed of 40.4 m/s (90 mi/h) and is hit straight back at a speed of 45.7 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.00 ms, what is the average force exerted on the ball by the bat? Neglect the...
November 18, 2012

Statisitcs
The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and the standard error of the mean, and the ...
November 14, 2012

Physics
An astronaut in his space suit and with a propulsion unit (empty of its gas propellant) strapped to his back has a mass of 146 kg. The astronaut begins a space walk at rest, with a completely filled propulsion unit. During the space walk, the unit ejects some gas with a ...
November 13, 2012

Physics
The skateboarder in the drawing starts down the left side of the ramp with an initial speed of 5.4 m/s. If nonconservative forces, such as kinetic friction and air resistance, are negligible, what would be the height h of the highest point reached by the skateboarder on the ...
November 12, 2012

physics
A hockey goalie is standing on ice. Another player fires a puck (m = 0.22 kg) at the goalie with a velocity of +63 m/s (a) If the goalie catches the puck with his glove in a time of 7.0 10-3 s, what is the average force (magnitude and direction) exerted on the goalie by the ...
November 12, 2012

Physics
A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 26.0 m. She pushes in a direction 22.0° below the horizontal. A 38.0-N frictional force opposes the motion of the cart.
November 11, 2012

physics
The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts. Some of these studies use a machine known as a centrifuge. This machine consists of a long arm, to one end of which is attached a chamber in which ...
November 7, 2012

Physics
On a banked race track, the smallest circular path on which cars can move has a radius of 115 m, while the largest has a radius 165 m, as the drawing illustrates. The height of the outer wall is 18 m.
November 7, 2012

7th grade science Ms. Sue pleae only 1 question
fdf
November 2, 2012

Physics
The drawing shows a circus clown who weighs 710 N. The coefficient of static friction between the clown's feet and the ground is 0.49. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force ...
October 25, 2012

Physics
Well, hard to imagine the picture, but by the description the wires each side are at 16 deg. back on each side of the tooth, i.e. each at 16 deg. to the face of the tooth. Each has 18N. tension. (sin 16) x 18 = 4.9608N. Double it (2 wires), = 9.9216N. back on the tooth.
October 25, 2012

phyics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
October 10, 2012

Math
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the ...
October 9, 2012

math (calculus)
A room has dimensions 2.24 m (height) × 5.30 m × 6.55 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner. (a) What is the magnitude of its displacement? (b) If the fly walks rather than flies, what is the length of the ...
October 9, 2012

Math
(2.0)t^2/2 = (9.5)t t=????
October 9, 2012

Physics
A train at a constant 44.0 km/h moves east for 42 min, then in a direction 45.0° east of due north for 17.0 min, and then west for 51.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
October 9, 2012

physic
f(t)=ct
October 4, 2012

physics
A 5.9-kg rock and a 3.0 10-4-kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth.(b) Calculate the magnitude of the acceleration of each object when released.
October 3, 2012

Algebra,Geometry
You could actually set "X"=0 to find Y, and then plug in a "0" for Y to get X.
September 30, 2012

Math
Thank you!
September 24, 2012

Math
I think. I am honestly not sure what to do.
September 24, 2012

Math
The volleyball court -if it id 80 ft long and 50 ft wide, how would you find the dimensions of the court? Explain please! Remember that I am a 6th grader. Please don't give me a 10-12th grade answer.
September 24, 2012

grade 9 science
a student wants to estimate the population size and density of birch trees in a woodlot measuring 100 m by 100 m. On a diagram of the woodlot, she splits the area into a 10 by 10 grid and randomly selects 10 sample quadrants - (0,0), (1,4), (2,6), (3,9), (4,3), (5,5), (6,1), (...
September 10, 2012

d
the school auditorium has 8 rows of seats, divided in three rows. Each section has 15 seats. How many seats are there in total?
September 5, 2012

health
The lower thigh muscles are rectus femoris, vastus lateralis and medialis. Located in the back of your leg are the hamstrings. These muscles help you run, jump, and walk!
August 22, 2012

Macroeconomics
D Marginal Cost
July 10, 2012

statistics
In a survey of 400 college students, 40 were left-handed. Treating the sample as if it were random and using 0.015 as the standard deviation of the sampling distribution of the sample proportion, what is the lower bound of a 95% confidence interval for the population proportion?
May 18, 2012

marketing
Unit 5 Individual Project Deliverable Length: 4-5 body pages, 1 PERT chart, 1 Gantt chart Details: Using your current work organization (or an organization of interest) as the subject matter, research the elements of business and prepare an APA formatted paper that: Analyzes ...
April 22, 2012

Calculus
2) 2*x*e^(-4) 3) 2*x*e^(sin(x))+x^2*cos(x)*e^(sin(x)) 1) e^(x)*sin(x)^2+2*e^(x)*sin(x)*cos(x)
April 20, 2012

maths
a) 1/6,1/7,1/8,...
April 20, 2012

Science
idk!!
April 8, 2012

simple subject
What is the simple subject in: The black and white Schnauzer barked all day long.
March 27, 2012

math
0.009615
March 26, 2012

biology
Why is a denaturing solution used in the Southern blotting technique?
March 9, 2012

physics
DOnt know
February 29, 2012

chemistry
32.2
February 29, 2012

math
how many line segments are in the word FAME?
February 28, 2012

physics
I HATE YOU
February 20, 2012

physics
adfs
February 20, 2012

physics
dsgbv
February 20, 2012

physics
fuk u
February 20, 2012

algebra
how do you solve -x+2y=2
February 8, 2012

Physics C
A point charge of 5.5 µC is located at the center of a spherical shell of radius 30 cm, which has a charge −5.5 µC uniformly distributed on its surface. Given: ke = 8.98755 × 10^9 Find the electric field for a point inside the shell a distance 12 ...
February 1, 2012

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?
February 1, 2012

World Civ
What were the social and administrative foundations of the absolute power of Ming Quing emperors?
February 1, 2012

World Civ
How did advances in military technology change warfare in 16th century Japan? How was the strategic balance of power reflected in the government created by Tokugawa leyasu?
February 1, 2012

World Civ
Why were so many people living in the European countryside dependent on aristocracy? (during and before the agricultural revolution in Europe)
February 1, 2012

geometry
Quadrilateral QRST is a square. If the measure of QR is 3x – 6 and TS is 6 - x. Find the area of the square.
January 20, 2012

english
Actually, can you just post your email address, and then we can figure stuff out through email?
January 9, 2012

english
When you get the answers to the final....please post them!
January 9, 2012

english
Explain your changes?
January 3, 2012

home economics
When were the Home Economics Courses dropped or greatly reduced by the school system in Ontario.
November 27, 2011

Calculus 1
If you have 280 meters of fencing and want to enclose a rectangular area up against a long, straight wall, what is the largest area you can enclose?
November 22, 2011

Physics
Air in a balloon does 25 J of work while absorbing 81 J of heat. What is the change in internal energy?
November 19, 2011

Ashford
Beth gives Megan $2 allowance a week. Then she takes Megan shopping and allows her to select what she wants to buy. If the item desired costs more than $2, Megan's mother suggests she save her money until she has enough saved to pay for the desired item. When Megan ...
November 1, 2011

Maths Grade 8
fart
October 26, 2011

Algebra
Rewrite -81/(-88) as multipulcation
October 23, 2011

Algebra
whats the answer for 14(3-7x)=-(9+2x) with simple steps on how to do it
October 16, 2011

specific heat capacity
figured it out.
September 26, 2011

specific heat capacity
How much heat would be required to heat 1 gram of pure liquid water from 10C to 20C? How would i approach this problem?
September 26, 2011

math
how do yo convert hte ratio 120:200 to a fraction in simpliest form
September 24, 2011

Math
Jake says that adding 0 does not change a sum. Is he correct? explain.
September 20, 2011

Math
Ms. Poole, my PE teacher, asked the 100 seventh in my school if they could swim. Half the boys and two thirds of the girls said yes. Seventeen boys said no. How many seventh graders know how to swim?
September 13, 2011

Chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...
September 12, 2011

chemistry
When 1.0 g of gasoline burns, it releases 11 kcal of heat. The density of gasoline is 0.74 g/mL a) How many megajoules are released when 3.0 of gasoline burns? b) If a television requires 150 kJ/h to run, how many hours can the television run on the energy provided by 3.0 gal ...
September 10, 2011

american history
what is one reason colonist came to america
August 24, 2011

Chemistry
A sample of 0.43 moles of a metal M reacts completely with excess chlorine to form 18.23 grams of MCl. How many moles of Cl are in the sample of MCl that forms?
July 30, 2011

criminal law
thank you Ms. sue
July 22, 2011

criminal law
Describe current parole and mandatory release policies
July 22, 2011

math
Simplify: (3-7x)/8+(2x+3)/8
July 5, 2011

geometry
Given the quadrilateral ABCD with the following vertices A(-4, 0), B(10, 0), C(10, 10), and D(0, 14), find its area.
June 6, 2011

geometry
Consider the following. newskills15 Solve for BC (the the nearest hundredth).
June 6, 2011

Precalculus
Consider the following. f\(x\) = 5tan(1/3 x + pi/2) The period of the function above is ...
June 6, 2011

geometry
In ΔABC, angleB = 46°, angleC = 28° and AB = 50. Find BC (to the nearest hundredth).
June 6, 2011

chem
calculate the amount of heat (kcal) released when 50.0 g of water at 100degrees Celsius hits the skin and cools to a body temperature of 37 degrees Celsius.
June 2, 2011

chemistry
calculate the volume of sulfur dioxide produced when 27.9 mL O2 reacts with carbon disulfide to produce carbon dioxide and sulfur dioxide at STP
May 25, 2011

physics
(c) Tube (c) is again filled with water. A1 and A2 are the same as in part (b). Two pistons apply different forces to the water in the tube so that the water in the right side of the tube is a height h = 0.43m above the height of the water in the left side of the tube. If F2...
May 1, 2011

e-commerce
The business plan should include the concepts and ideas covered during the past several weeks. The following points need to be addressed in your business plan for the establishment of an e-commerce site: The e-commerce infrastructure Marketing concepts for the e-commerce ...
April 28, 2011

Finance
62,025
April 12, 2011

Math 116
Use all available methods (in particular, the Conjugate Roots Theorm if applicable) to factor the polynomial function completely, making use of the given zero, f(x)=x^4+x^3+4x^2+196x-2205; -7i is a zero.
April 8, 2011

calculus
A missile is fired at an angle of 75 from the horizontal. At one point, its speed was 900 mph. Find its horizontal velocity in miles per minute
April 1, 2011

physics
ddd
March 13, 2011

math
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume...
March 6, 2011

chem
Magnesium burns in air to produce magnesium oxide, MgO, and magnesium nitride, Mg3N2. Magnesium nitride reacts with water to give ammonia. Mg3N2(s) + 6 H2O(l) → 3 Mg(OH)2(s) + 2 NH3(g) What volume of ammonia gas at 24°C and 753 mmHg will be produced from 4.46 g of ...
March 6, 2011

Physics Mehanics
A meter stick is held vertically with one end on the floor and is then allowed to fall. Find the speed of the other end when it hits the floor, assuming that the end on the floor does not slip. (Hint: Consider the stick to be a thin rod and use the conservation of energy ...
February 24, 2011

Physics Mehanics
In the figure below, wheel A of radius rA = 11 cm is coupled by belt B to wheel C of radius rC = 23 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.6 rad/s2. Find the time needed for wheel C to reach an angular speed of 110 rev/min, assuming the...
February 24, 2011

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