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December 18, 2014

Posts by dan


Total # Posts: 910

physics
correct me if im wrong solve for a = 102 and v = 1249
September 14, 2011

physics
ok i get
September 14, 2011

physics
where did you get the 144
September 14, 2011

physics
a uniformly accelerating train passes a green light signal at25.0 km/hr it passes a second light 125m farther down the track 12.0s later what is the trains acceleration? what is the trains velocity at the second light?
September 14, 2011

physics
a uniformly accelerating train passes a green light signal atk mhr it passes a second light 125m farther down the track 0s later what is the trains acceleration? what is the trains velocity at the second light?
September 14, 2011

English Correction
2-orient 4- 5-discern
September 14, 2011

math
moving straight ahead pg 12 #3
September 11, 2011

math
moving straight ahead pg 12 #3
September 11, 2011

Calculus
Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Then find the area of the region. 2y=3sqrtx , y=3 , 2y+2x=5
August 17, 2011

public health
Where did the practice of public health first originate? North america South America Asia is it North America?
August 8, 2011

English 12
Does anyone know what book will we be using for poems,short stories and literature in Grade 12?
July 23, 2011

chemistry
I understand how to do the steps. but the wording is different on this problem, that is what I don't understand?
July 13, 2011

chemistry
What is the percent yield for the reaction PCl3(g) + Cl2(g) --> PCl5(g) if 119.3 g of PCl5 are formed when 61.3 g of Cl2 react with excess PCl3? I don't understand how to set this up?
July 13, 2011

chemistry
iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how ...
July 12, 2011

Public health
monitoring of reports of communicable diseases in the community types: descriptive and analytic epidemiology is used to determine such
June 28, 2011

chemistry
How many grams of O2 are required to burn 46.0 grams of C5H12?
June 22, 2011

history
Describe how influential the Cold War has been on the world of today.
June 11, 2011

math
Block method: 8 teachers for 5 courses [#]*[#]*[#].... [8]*[7]*[6]*[5]*[4]= ?
June 7, 2011

Statistics
A bag of marbles has 5 Green, 4 Red, and 3 yellow marbles. Three marbles are randomly drawn from the bag, without replacement: What is the probability that at least one of the three marbles drawn are red? What is the probability that only one of the three marbles drawn is red...
June 7, 2011

MATH please help
thanks
June 6, 2011

MATH please help
Out of 42 kids in a class twice as many failed Ela as math,4 failed both. If 7 failed neither, find how many failed each subject. Please help and show work it would be great thanks i really need help thanks
June 6, 2011

Statistics
Under what circumstances does the sampling distribution of the proportion approximately follow the normal distribution?
June 3, 2011

Geometry
V of cube = side*side*side = 6*6*6 = 216 V of hemisphere = 1/2 of V of sphere = 4/3*pi*radius cubed = 1/2(4/3(pi 3cubed))= 1/2(4/3(pi 27)= 1/2(36pi)= [18pi meters] or [56.52 meters]
June 1, 2011

Science
Using the balanced equation for this reaction, calculate the volume of CO2 that should be produced by the decomposition of 2.21g of CuCO3•Cu(OH)2 at STP.
June 1, 2011

math
20+d+10 where d=30, 20+30+10=60minutes or 1 hour
June 1, 2011

Physical Science 2nd Semester
I hope this answers your question!!
May 24, 2011

world issuse
I'm a 7 letter word u read daily,my 5th 6th and 7th letter increase each year,my 3rd n 4th letter are the same,my 3rd 2nd n 5th letter cover 75% of the world.
May 24, 2011

english
Thanx
May 23, 2011

english
Pls Re-arrange this word aidgact
May 23, 2011

english
Is incense a social problem and why ?
May 14, 2011

Algebra
what does the sigma notation look like for the sequence 1/4,-1/9,1/16,-1/25
May 12, 2011

math
If a a sheet of cardboard measures 9 feet by 6 feet and is made into a perfect cube, what would the length of each edge be?
May 9, 2011

math
If a a sheet of cardboard measures 9 feet by 6 feet and is made into a perfect cube, what would the length of each edge be?
May 9, 2011

Chemistry
Calculate the pH of a solution that is made by mixing 10.00 mL of 0.2500 M HCl with 35.00 mL of .1500 M HNO3 and diluting the mixture to a total volume of 100.00 mL
May 5, 2011

Science
I would recommend to check out a website called physmatixsolve They helped me with a tough question i got in my Physics homework, classical mechanics. The amazing thing is that they really sent me the solution in less than 24 hours, which is pretty neat.
April 25, 2011

Physics
A 395cm oscillator has a speed of 104.5cm/s when its displacement is 2.80cm and 74.5cm/s when its displacement is 6.60cm. What is the oscillator's maximum speed?
April 24, 2011

Physics
A 20 cm long, 180g rod is pivoted at one end. A 17g ball of clay is stuck on the other end. What is the period if the rod and clay swing as a pendulum?
April 24, 2011

spelling
future
April 20, 2011

Math
Kelly takes 6 laps and Angela takes 5 laps so they both meet at the starting point at 90 minuets...1 hour and 30 minuets.
April 20, 2011

Math
If angle x lies in quadrant 3 and cos(x)= -0.6 Find cos(3pi/2-x)
April 20, 2011

trig
angle x lies in quadrant 3 and cos(x)=-.6. Find cos(3pi/2-x)
April 19, 2011

A level english literature
I need to write an essay comparing estrangement and alienation in cat on a hot tin roof and awakening, I sort of know what to write but I'm struggling to get a good opening to my essay. Help!
April 19, 2011

Physics
Fresh snow is about one-tenth as dense as liquid water. How much latent heat is released in storm clouds per square kilometer of surface area by the freezing of water droplets if the storm deposits a 30-cm-deep layer of fresh snow? Q = LfM where the mass is the density of ...
April 14, 2011

Physics
PROJECTILE LAUNCHED FROM EARTH'S SURFACE? A projectile is shot straight up from the earth's surface at a speed of 1.20×10^4km/hr. How high does it go? (answer in km) Supposed to solve this using F=G(mm/2r)...?
April 12, 2011

Physics
Speed of Asteroids With the same Radius? Two spherical asteroids have the same radius R . Asteroid 1 has mass M and asteroid 2 has mass 2M. The two asteroids are released from rest with distance 10R between their centers. What is the speed of each asteroid just before they ...
April 12, 2011

Physics
Finding a Lunar lander's Thrust? A 6000kg lunar lander is in orbit 50km above the surface of the moon. It needs to move out to a 200km -high orbit in order to link up with the mother ship that will take the astronauts home. How much work must the thrusters do in joules?
April 12, 2011

Physics
An 9.00-cm-diameter, 400 sphere is released from rest at the top of a 1.90-m-long, 20.0 incline. It rolls, without slipping, to the bottom. A) What is the sphere's angular velocity at the bottom of the incline? B) WWhat fraction of its kinetic energy is rotational?
April 10, 2011

physics please help!
Suppose that 90 g of hot water at a temperature of 75 degrees C is poured into a cavity in a very large block of ice at 0 degrees C. (a) What will be the final temperature of the water in the cavity? (b) What mass of ice must melt in order for the water to cool down to the ...
April 8, 2011

math
the density of a diamond is 3.52 grams per cubic centimeter. Sally has a diamond that has a volume of 20 mm^3. What is the weight of the diamond?.
April 6, 2011

math
Thank you!!
April 6, 2011

math
The density of a crystal is 2.65 grams per cubic centimeter. Ryan has a rectangular prism made of quartz. It measures 10 cm by 10 cm by 6 cm. Find the weight of this crystal in kilograms.
April 6, 2011

math
i am greater than 15 and less than 40.if you double me, i become a number that ends in 0.1/5 of me is equal to 5.
April 5, 2011

Chemistry
Thanks a lot man!
April 3, 2011

Chemistry
The Ksp for a certain metal hydroxide, M(OH)2 (molar mass = 127) is 3.5 × 10-19. What is the pH for a saturated solution of this hydroxide? Confused on how to set up this problem...
April 3, 2011

Maths
What is 5y=9+2y
March 30, 2011

Physics
An object initially at a temperature of 80 C cools by 1 C in a time of 15 s when placed in a 20 C room When the object's temperature reaches 50 C, what is the average rate at which the object cools?
March 28, 2011

math
Consider the polynomial x^3 + 6x^2 + 3x - 10. Without dividing, or graphing, which two of (x+2), (x-2), (x+1), and (x-1) must be factors of the polynomial? Why/how do you know?
March 27, 2011

math
Find an equation of a polynomial function of degree 5 with integer coefficients with zeros 0, -2, and 1/2.
March 27, 2011

algebra
Find an equation of a polynomial function of degree 5 with integer coefficients with zeros 0, -2, and 1/2.
March 27, 2011

math
What percentage of 13,000.00 is 8,000.00
March 23, 2011

Physics
A 1900 car starts from rest and drives around a flat 50--diameter circular track. The forward force provided by the car's drive wheels is a constant 1300 . A) What is the magnitude of the car's acceleration at ? B) What is the direction of the car's acceleration at...
March 15, 2011

Physics
A 30.0 ball rolls around a 50.0 -diameter L-shaped track, shown in the figure, at 60.0 . What is the magnitude of the net force that the track exerts on the ball? Rolling friction can be neglected.
March 15, 2011

Physics
A rocket-powered hockey puck has a thrust of 2.40 and a total mass of 1.40 . It is released from rest on a frictionless table, 2.90 from the edge of a 1.80 drop. The front of the rocket is pointed directly toward the edge. How far from the table does the puck land?
March 15, 2011

chemistry
What reagent converts sodiumethanoate to methane?
March 15, 2011

math
The larger circle has a radius that is 18 inches longer than the smaller circle. The larger circle has a circumference that is A pi feet larger then the smaller circle. find the value of a.
March 15, 2011

BIOCHEM
what are the problems created by using molecular oxygen as a recipient of the electrons from the oxidation of carbon compounds.
March 14, 2011

math
How do you find the circumference of a circle?
March 14, 2011

yes
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:
March 13, 2011

science
Start early - plant germination takes time regardless of the plant. Also you must be sure to replicate each plants environment as much as possible. Same potting soil, same sunlight, same amounts of liquid at the same time. Also you should have a control group. Since you are ...
March 7, 2011

Chemistry
Calculate the mass of sodium bicarbonate needed to neutralize 3.0 mL of 3.0 M HCl. Show your work.
March 2, 2011

Chemistry
Calculate the mass of sodium bicarbonate needed to neutralize 3.0 mL of 3.0 M HCl. Show your work.
March 2, 2011

Physics
conical pendulum is formed by attaching a 0.200 ball to a 1.00 -long. It has a radius of 40.0cm . What is the angular velocity of the ball if the tension in the string is 2.14N?
March 1, 2011

Physics
conical pendulum is formed by attaching a 0.200 ball to a 1.00 -long. It has a radius of 40.0cm . What is the tension in the string?
March 1, 2011

Physics
conical pendulum is formed by attaching a 0.200 ball to a 1.00 -long. It has a radius of 40.0cm . What is the tension in the string?
March 1, 2011

Physics
conical pendulum is formed by attaching a 0.200 ball to a 1.00 -long. It has a radius of 40.0cm . What is the tension in the string?
March 1, 2011

math
Not enough information. However, if the problem gave Harry's total amount of money, or a percentage based on the 12 dollars spent, it would be solvable. Think about how you would solve it if this information was given.
February 28, 2011

math
Make an estimation of how many weeks are in a month. Calculate how many total weeks there are in 8 months. Multiply the weekly gas expense by the total number of weeks.
February 28, 2011

8th grade science
velocity is speed with direction For example.... An airplane is flying East at 300 miles per hour Its speed is 300 miles per hour Its velocity is 300 miles per hour East
February 28, 2011

physics
Frequency is the number of waves that pass by in one second. You know that 8 waves pass by in 30 seconds. How many pass by in 1 second? Period is the time it takes for one wave to pass by. Period is the inverse of frequency (T = 1/f). Wavelength is the distance measured from ...
February 28, 2011

Physics
This problem can be solved with the conservation of energy. The total amount of energy in the car is the same before and after the collision with the spring. The car's kinetic energy before the collision is completely converted to spring potential energy after the ...
February 28, 2011

English
Is "after the hurricane" a pharase or clause?
February 27, 2011

science
The best thing I have done for conversions throughout all of my education was learn this saying: Kings over Humans over Dragons over Dogs over Cats over Mice (or if you prefer: "King Henry Died Drinking Chocolate Milk) broken down that gives: K H D * D C M this is short ...
February 27, 2011

Math
u x 6 2/3=20
February 26, 2011

PHYSICS
The weight of fully saturated soil in a prism having a 4.00 sq. ft. base (or a base of 4.00 ft*ft) is 4,000 lbs. Pore pressure at the base is 499 lbs/(ft*ft). True or False: The effective stress at the base is 501 lbs/(ft*ft).
February 26, 2011

Math-Statistics
D. Within 239 to 507 minutes.
February 21, 2011

Physics (Force and Motion)
392 N
February 19, 2011

groundwater science
Assume that a losing stream exists in physical connection with groundwater in an isotropic unconfined aquifer. Assume that several contour lines of equal head cross the stream and intercept it. These contour lines of equal head are "V-shaped", with the point of the &...
February 19, 2011

Math/Radioactive Dating
No Calculator Necessary. Age 0: 0 Ar40 Age 1.25 billion years: half of the K40 is now Ar40, so 1 part of K40 and 1 part of Ar40 Age of 2.5 billion years: one quarter K40 and three quarters Ar40; so 1 part K40 to 3 parts of Ar 40
February 19, 2011

Physics-Resonance
A 3.00 m long pipe is in a room where the temperature is 20 C. What is the fundamental frequency if the pipe is closed at one end? Would this count as an open pipe still, or a closed pipe? This is what I did. Wavelength = 2L/n Wavelength = 2(3)/1 Wavelength = 6 (331 + (.6*20...
February 14, 2011

chemistry
19. Convert 15 ppm of benzene to mg/m3 at 20 oC and 720 torr Density of a gas is g/L = P(MW)/RT (740 torr x 1 atm/760torr)(78.114g/mole)/ (.0821L atm/mole K)(293K) = 3.16g/L 1ppm =1 L Benzene/106 L of air = 1L ben/1000 m of air = 0.001 L ben/m3 = 0.00316 g/m3 x/3.16=15 = 47....
February 14, 2011

CHEMISTRY
19. Convert 15 ppm of benzene to mg/m3 at 20 oC and 720 torr Density of a gas is g/L = P(MW)/RT (740 torr x 1 atm/760torr)(78.114g/mole)/ (.0821L atm/mole K)(293K) = 3.16g/L 1ppm =1 L Benzene/106 L of air = 1L ben/1000 m of air = 0.001 L ben/m3 = 0.00316 g/m3 x/3.16=15 = 47....
February 14, 2011

CHEMISTRY
19. Convert 15 ppm of benzene to mg/m3 at 20 oC and 720 torr Density of a gas is g/L = P(MW)/RT (740 torr x 1 atm/760torr)(78.114g/mole)/ (.0821L atm/mole K)(293K) = 3.16g/L 1ppm =1 L Benzene/106 L of air = 1L ben/1000 m of air = 0.001 L ben/m3 = 0.00316 g/m3 x/3.16=15 = 47....
February 14, 2011

CHEMISTRY
Benzene equals 78.11 grams/mole
February 14, 2011

CHEMISTRY
Grams/mole benzene
February 14, 2011

science
12. Aluminum in blood plasma was shown to undergo a first order elimination reaction with a half-life of 160 days. If the initial concentration was 8.2 µg/L, how long will it take for the concentration to drop to 2.5 µg/L?
February 13, 2011

groundwater science
For one dimensional flow, what is the flow rate in a 2.0-m long sample of clean saturated sand having a cross-sectional area of 0.05 m2, and a hydraulic conductivity value of 10-3 m/s, if the drop in head over the length of the sand sample is 0.03 m?
February 11, 2011

Physics
Two waves are combined to form this standing wave equation of y(x,t) = (3 mm)sin[x/(2 m]cos[(100 rad/s)t] a. What's the amplitude of the right moving wave and left moving wave? b. What's the wavelength of the right moving wave and left moving wave? c. What's the ...
February 11, 2011

Physics
For the second part, since this is a sine function, there's a particular angle that would have the same value as 0.8333. Like sin(0 deg) and sin(180 deg) equals to 0. So I did 180 - 56.4 to get that particular angle. Once I got that, I converted it to radians and repeated ...
February 6, 2011

Physics
Thanks, I wasn't able to get the second part of the answer (got a spring constant of 24.21 N/m) correct though.
February 6, 2011

Physics
A particle of mass m = 0.40 kg oscillates on the end of a spring with an amplitude of 0.30 m. At t = 0, it's at it's equilibrium position (x=0) and is moving in the positive x-direction. At 0.20 s later it is at x = 0.25 m. a. What is the lowest possible value for the ...
February 6, 2011

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