Saturday

March 28, 2015

March 28, 2015

Total # Posts: 75

**physics**

A particle moves in a straight line with an acceleration a ms^-2 at time 't' seconds where a = - 1/t² when t=1 the particle has a velocity of 3ms^-1 then find the velocity when t=4
*August 19, 2014*

**physics**

A particle moves according to the eqn a=-kv where a is acceleration and v is the velocity and k is a constant. If initial speed is V0 find the speed at any instant
*August 19, 2014*

**physics**

An astronaut is on the surface of planet whose air resistance is negligible. To measure the acceleration due to gravity(g) he throws a stone upwards. He observe that the stone reaches the surface to a maximum ht of h =10m(which is negligible is compare radius of planet) and ...
*August 19, 2014*

**physics**

A train starts from station A at 1pm and reaches station B at 3 pm, aftet travelling 108 km. It halts at station B for one hour and then starts for station c which is 42 km fron station B. It reaches station c at 7pm on the same day. The avg speed fo the train for the whole ...
*August 19, 2014*

**physics**

For a particle undergoing rectilinear motion with uniform acceleration, the magnitude of displacement is one third the distance covered in some time interval. The magnitude of final velocity is less than magnitude of initial velocity for this time interval. Then the ratio of ...
*August 19, 2014*

**physics**

A lift starts from the top of a mine shaft and descends with a constant speed of 10 m/s. 4 s later a boy throws a stone vertically upwards from the top of the shaft with a speed of 30 m/s. Find when and where stone hits the lift [take: g=10 m/s²]
*July 17, 2014*

**physics**

A body starts with an initial velocity of 10m/s and moves along a straight line with a constant acceleration. When the velocity of the particle becomes 50 m/s the acceleration is reversed in direction without changing magnitude. Find the velocity of the particle when it ...
*July 17, 2014*

**physics**

A toy plane p starts flying from point A along a straight horizontal line 20 m above ground level starting with zero initial velocity and acceleration 2 m /s² as shown. At the same instant, a man P throws a ball vertically upwards with initial velocitu 'u'. Ball ...
*July 15, 2014*

**math**

The expression y=ax²+bx+c has always the same sign as of 'a' if:
*July 10, 2014*

**chemistry**

The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is?
*July 7, 2014*

**chemistry**

The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is?
*July 7, 2014*

**maths**

1. Log10²x+log10x²=log10² 2-1 2. Log4(log2x)+log2(log4x)=2 3. X^logx+5/3= 10^5+log x 4. Log 1/2(x-1)+ log 1/2(x+1)-log1/√2(7-x)=1
*June 26, 2014*

**maths**

1.Log10(x²-12x+36)=2 2.log4 log3 log2 x=0 3.log3 [log9x+1/2+9x]=2x 4.2log4(4-4)=4-log2(-2-x)
*June 26, 2014*

**physics**

1)if y=e^x . cot x then dy/dx will be 2) f(x)=sin²x-cos²x then the value of f' (π/4)
*June 20, 2014*

**physics**

1)if y=x³+2x²+7x+8 then dy by dx will be- 2) if y= 1/x⁴ then, dy by dx will be: 3) if y = x² sin x, then dy/dx will be-
*June 20, 2014*

**physics**

1) y=4+5x + 7x³. Find dy/dx 2) if y= tan x cos²x then dy by dx will be-
*June 20, 2014*

**physics**

1)Y=x+x².+1/x+1/x³ find dy by dx 2)y=x²+1/x². Find dy by dx
*June 20, 2014*

**physics**

1.∫ x³(x+1)dx 2.∫ (1-cot²x)dx 3.∫ cosx(tan x + sec x) dx 4.∫ dx/√5x+8 using u= 5x+8 and using u= √5x+5
*June 20, 2014*

**physics**

1.∫ x³(x+1)dx 2.∫ (1-cot²x)dx 3.∫ cosx(tan x + sec x) dx 4.∫ dx/√5x+8 using u= 5x+8 and using u= √5x+5
*June 19, 2014*

**physics**

Its physics
*June 19, 2014*

**physics**

1.∫ csc (u-π/2) cot (u-π/2) du. 2.∫ sec^2(3x+2)ds 3.∫ √3-2s ds 4. ∫ 12(y^4+y4y^2+1)^2 (4^3+2y) dy use u= y^4+4y^2+1
*June 19, 2014*

**ineering mechanics**

IF THE COEFFICIENT OF ROLLING RESISTENCE OF A CYLINDER OF RADIUS R=1FT ROLL FROM UNIFORM VELOCITY?
*June 16, 2014*

**Chemistry**

Kc = ([x]^2)/A 7.94*10^-6 = ([x]^2)/2.70 M 2.1438*10^-5 = x^2 x = 4.630118789*10^-3 I hope this helps Janavi.
*April 5, 2014*

**Chemistry**

Initially: H2S = 0.28 H2(g) = 0 S(g) = 0 At equilibrium: H2S = 0.28 - x H2(g) = x S(g) = x Kp = Products/Reactants = ([x][x])/(0.28-x) x^2 +0.813x-0.22764 = 0 x =(-b plus or minus sqrt(b^2 -4ac))/2a x = 0.220303199 or approximately 0.220 What is the total pressure in the ...
*April 5, 2014*

**Chemistry**

All you have to do Step 1: Set the solids equal to 0 for G Step 2: Look up the gases (in this case just CO2) Step 3: Once you look up thr gasses add the delta g for each equation to each other. Step 4:Solve for Q using the Delta G= delta G not plus RTLnQ **Remember Delta G ...
*March 23, 2014*

**Science**

Also forgot to include: I2(aq) + I- <-> I3- (aq) = AQUEOUS LAYER I2(aq) <-> I2 = VARSOL
*March 9, 2014*

**Science**

Sorry, my apologies. After adding Na2S2O3, the Varsol layer became colorless and there was no change in the Aqueous layer.
*March 9, 2014*

**Science**

Hello. I have this question for my class. We were to mix Na2S2O3 to a a test-tube with Varsol layer on top and an Aqueous layer (of I2/KI) on the bottom. I observed a lighter colour change in both layers. How would I express that as a chemical equation? Also, I added saturated...
*March 9, 2014*

**psy**

Define cognitive bias and choose two that you may experience. Explain how you would use critical thinking to overcome cognitive bias to ensure academic success
*January 10, 2014*

**maths**

A movie company wants to make movies featuring various monsters. They want each movie to have at least 2 different monsters and no two movies to have the exact same set of monsters. What is the minimum number of monsters the company must use in order to make a million movies?
*October 27, 2013*

**maths**

ABC is a triangle BD & CE are altitudes drawn from the vertex B & C. Prove that ABC is an isoceles triangle
*June 19, 2013*

**physics **

Use the Biot Savart law to compute the magnetic field at the center of a metallic ring. the ring has a radius of 10^-6 m and is connected to two infinite wires. the current in the wires is 1 amp. the ring is lying in the [x,y,z= 0 ] plane. the first wire is attached to the ...
*May 21, 2013*

**confederation college**

1.52 kg box slides 1.24 m a long a level surface.the co-efficient of kinetic friction between book and surface is 0.140.find the work done by friction?
*April 11, 2013*

**geometry**

find k if one of the lines given by kx^2+10xy+8y^2=0 is perpendicular to 2x-y=5
*March 2, 2013*

**Math**

The diameter of the balloon after 3 s is 8.64cm.
*January 13, 2013*

**physics**

The answer I get is 12.24 rad/s. Can anyone confirm this?
*December 12, 2012*

**physics**

A rod of length L = 1.2 m pivots freely about one end. The rod is held horizontally and released, with no intial velocity. Find the angular velocity of the rod as it passes through the vertical orientation. (Use conservation of energy. The rotational inertia of a rod like this...
*December 12, 2012*

**physics**

A 45.0 kg object is moving with a velocity of 17 m/s. How long must a 25.0 N force act on the object to bring it to a complete stop
*January 26, 2012*

**geometry**

the length of the median drawn to the hypotenuse of a right triangle is represented by 3x-7, while the hypotenuse is represented by 5x-4. Find the length of the median.
*January 7, 2012*

**math**

what are the seconds in 19.8 degrees
*December 8, 2011*

**Genetics**

Given below is a pedigree in which the inheritance of an autosomal dominant disease gene is being followed. Linked to the disease gene (3 cM = 3% recombination away) is a RFLP marker with 2 alleles (5 kb and 3 kb). Given the DNA marker compositions for children II.2 and II.3 (...
*October 10, 2011*

**HELP!!!!**

why do we celebrate hispanic heritage month
*October 10, 2011*

**English please help!!!!!**

In the book The Pearl By John Steinbeck. The rich and powerful usually dominate the poor and uneducated. In the book who was rich?who did they dominate? Please give me alot of information
*October 4, 2011*

**Social Studies please help**

why did many native born americans in the late 1800 were in favor of restricting immigration?
*October 3, 2011*

**Global History ( persians and assyria)**

and similarties THANK YOU
*October 3, 2011*

**Global History ( persians and assyria)**

differences between Assyria empire and persian empire
*October 3, 2011*

**science please help**

a person touches a hot stove with her hand and quickly pulls it away in pain. Identify which three organs systems the body utilized in this reaction and explain the role each organ system played.
*October 1, 2011*

**science**

a person touches a hot stove with her hand and quickly pulls it away in pain. Identify which three organs systems the body utilized in this reaction and explain the role each organ system played.
*October 1, 2011*

**sciecnce (hypothesis)**

ok thanks got it
*September 18, 2011*

**sciecnce (hypothesis)**

i need to do that experiment above is the hypothesis corrrect
*September 18, 2011*

**sciecnce (hypothesis)**

Am doing a experiement with a egg and trying to see if the shell dissolves hypothesis: If the solution is vinegar then the egg shell will dissolve. Is the hypothesis correct
*September 18, 2011*

**math**

what are the rules to adding and subtracting negative numbers and positive numbers?
*September 13, 2011*

**Word meaning please**

what is Hemophilia? please explain thanks
*September 13, 2011*

**geometry**

the sides of a quadrilateral abcd are 6cm,8cm,11cm and 12cm respectively,and the angle between the first two sides is a right angle.find its area.
*June 22, 2011*

**Social Studies **

What are the social classes of Poland?
*June 9, 2011*

**meaning of a word(quick) thanks**

beat out is a good word for surpass right
*May 18, 2011*

**meaning of a word(quick) thanks**

Left unabated, obesity will surpass smoking as the leading cause of preventable death in America What is a another word for surpass
*May 18, 2011*

**Math**

what is the difference between an equation and an inequality. Also could you give me a example of each
*May 17, 2011*

**Social Studies**

how has the National Junior Tennis League Chapter impacted human lives?
*May 16, 2011*

**calculus**

How do I integrate tanx (1+sec^4 x)^3/2 dx My daughter is doing surface area problems, and all the examples assume she knows how to finish it off once we get to the integration....
*February 25, 2011*

**Science**

Can I have as much information about seals as possible please?
*January 25, 2011*

**pre algebra**

13-3p=-5(3+2p)
*October 2, 2010*

**7th grade math**

25t=25t+5
*October 2, 2010*

**math**

14,500x09=1,305.oox05=6525 the answer is $6,525.00
*February 24, 2010*

**math**

a.5.30
*February 4, 2010*

**math**

b.3,219
*February 4, 2010*

**math**

a.$5.30
*February 4, 2010*

**math**

b.3,219
*January 24, 2010*

**Math**

d.1.67%
*November 12, 2009*

**business math**

whole 250.half 150
*July 12, 2009*

**Physics**

i dont know the answer but how 4 the man height varies
*January 1, 2009*

**MATH**

$14,500 loan at 9% interest for 5 years is525.00
*June 18, 2008*

**Maths - check answer**

a.$5.30
*March 11, 2008*

**social studies**

please give me the pictures of grasslands and forest of different parts of world provided with the description about them ? For grasslands, start with http://www.blueplanetbiomes.org/grasslands.htm From there, click to web sites for the North American prairie, South American ...
*June 15, 2007*

**Info. literacy**

what is the call number of the oldest copy of ellison,s shadow and act?
*March 6, 2007*

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