Tuesday

July 29, 2014

July 29, 2014

Total # Posts: 70

**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]

**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 reache...

**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 t...

**math**

The expression y=ax²+bx+c has always the same sign as of 'a' if:

**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?

**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?

**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

**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)

**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)

**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-

**physics**

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

**physics**

1)Y=x+x².+1/x+1/x³ find dy by dx 2)y=x²+1/x². Find dy by dx

**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

**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

**physics**

Its physics

**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

**ineering mechanics**

IF THE COEFFICIENT OF ROLLING RESISTENCE OF A CYLINDER OF RADIUS R=1FT ROLL FROM UNIFORM VELOCITY?

**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.

**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 cont...

**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 equ...

**Science**

Also forgot to include: I2(aq) + I- <-> I3- (aq) = AQUEOUS LAYER I2(aq) <-> I2 = VARSOL

**Science**

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

**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...

**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

**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?

**maths**

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

**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 rin...

**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?

**geometry**

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

**Math**

The diameter of the balloon after 3 s is 8.64cm.

**physics**

The answer I get is 12.24 rad/s. Can anyone confirm this?

**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...

**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

**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.

**math**

what are the seconds in 19.8 degrees

**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 (...

**HELP!!!!**

why do we celebrate hispanic heritage month

**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

**Social Studies please help**

why did many native born americans in the late 1800 were in favor of restricting immigration?

**Global History ( persians and assyria)**

and similarties THANK YOU

**Global History ( persians and assyria)**

differences between Assyria empire and persian empire

**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.

**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.

**sciecnce (hypothesis)**

ok thanks got it

**sciecnce (hypothesis)**

i need to do that experiment above is the hypothesis corrrect

**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

**math**

what are the rules to adding and subtracting negative numbers and positive numbers?

**Word meaning please**

what is Hemophilia? please explain thanks

**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.

**Social Studies **

What are the social classes of Poland?

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

beat out is a good word for surpass right

**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

**Math**

what is the difference between an equation and an inequality. Also could you give me a example of each

**Social Studies**

how has the National Junior Tennis League Chapter impacted human lives?

**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....

**Science**

Can I have as much information about seals as possible please?

**pre algebra**

13-3p=-5(3+2p)

**7th grade math**

25t=25t+5

**math**

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

**math**

a.5.30

**math**

b.3,219

**math**

a.$5.30

**math**

b.3,219

**Math**

d.1.67%

**business math**

whole 250.half 150

**business math**

whole 250.half 150

**MATH**

$14,500 loan at 9% interest for 5 years is525.00

**Maths - check answer**

a.$5.30

**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 p...

**Info. literacy**

what is the call number of the oldest copy of ellison,s shadow and act?

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