Total # Posts: 70

Physics
4m/s

Physics
A boy of mass 50kg running at 5m/s jums on to a 20kg trolly travelling in the same direction at 1.5m/s .what is their common velocity.

physics
what is the acceleration of ball if a ball throw to the wall with velocity of 6m/s and after striking the wall it backs with velocity of 4.4m/s the time for which ball strike the wall is 0.04seconds.

Science
Does nano3 turns phenolpthalein indicator pink?

physics
breaks are applied to a car moving with a velocity of 30 km/s . The breaks produce a retardation of 6 m/s^2 . How long will the car take before coming to a stop.

math
planning a delivery routes for a postman/milkman

Yea you're right

Chemistry
In the aqueous solution of H2SO4 its mole fraction is 0.2 then closest value of molality or solution is a)13.9 b)9.8 c)10.2 d)11.2

Math
The sum of squares of two numbers is 520 and there difference is 4 what is smaller number.

Maths
A scalene triangle cd also be acute or rat angled or obtuse angle triangle .please say tru e or false Ans according to me is yes

Math
In an isosceles triangle the verticle angle is 40° find the other two angle of the Triangle

math
1. if one side of a square is increased by 2metres and other side is reduced by 2 metres. a rectangle is formed whose perimeter is 48.find the side of the orignal square.

math
by unitry method

science
assuming the earth to be a sphere of uniform density,what will be the value of g in a mine 100th below the earth surface.Given r=6400 km and g=10m/s.

Maths
The distance between A and C is represented 7cm .What will be the distance in the map

Percentage
0.16666666666

Math
2√3x power3+3√3y power3+5√5-3√30xy

maths trignometry
Prove that. √seca+2sina/seca-2sina=Sina+cosa/sina-cosa

physics
0. 3125

Math linear equations
5(2x-3)-3(3x-7)=5

Math
3 dimension

maths class 6
1. JUGGLING NUMBERS From old newspapers cut out digits 0 to 9 and stick them in a creative manner. Make sure the digits are not too small. Juggle the digits to make the numbers described below. The challenge is you can use a digit only once in a number. 1) Make the smallest ...

Maths
Prove that sine inverse x = cosec inverse 1/x

Physics
A flywheel rotates

Maths
In a Box there are five pencils there are four boxes how many pencils are there

LFPS
No

Maths
Simplify ; 4 root (132 by143) minus 2

ckms
write a program to calculate the capacity of an automobile fuel tank in liters and the kmpl thst the automobile can be driven.

physics
A ball is thrown horizontally from a building of height 80m. the kine joining the top of the building to the point where it hits the ground makes an angle of 45 degrees with the ground. what is the initial velocity of the ball?

Pre-Cal
There exist two complex numbers c, say c1 and c2, so that 2 + 2i, 5 + i, and c form the vertices of an equilateral triangle. Find the product c1 c2. I need help

law
A short clause is basically a group of words that contains both the subject and something about the subject but cannot always be considered a full proper sentence.

Precalculus
Let z and w be complex numbers such that |2z - w| = 25, |z + 2w| = 5, and |z + w| = 2. Find |z|. I need a little help with absolute values on complex numbers.

Complex Numbers
The system of equations |z - 2 - 2i| = \sqrt{23}, |z - 8 - 5i| = \sqrt{38} has two solutions z1 and z2 in complex numbers. Find (z1 + z2)/2. Im really just plain old confused. Could anyone help me out?

Precalculus
Find the complex number z that satisfies (1 + i)z - 2 overline{z} = -11 + 25i. Im not sure how to solve this. I tried distributing the z out first but im still confused on this problem.

Precalculus
Let a and b be real numbers. The complex number 4 - 5i is a root of the quadratic z^2 + (a + 8i) z + (-39 + bi) = 0. What is the other root? I tried working this problem and so far I got that (a+8i) - (4-5i)= (-39-bi)/(4-5i). Im not sure how to solve this problem.

Algebra
What do the two terms have in common? Absolutely nothing except for 1. Therefore your answer should be 1.

Precalculus
Let S be the set of points {(r, theta): 2<=r<=6, pi/3 <= theta<= 5pi/6} Find the area of S. Im having trouble with this problem and have been stuck on it for a while. Any help?

Precalculus
For both theta = pi/2 and 3pi/2, r = 2. Does this mean that its only half an ellipse?

Precalculus
The graph of 4/(2-cos(theta)) forms a closed curve. The area of the region inside the curve can be expressed in the form k \pi. What is k^2? So I tried this problem and I got it to be an ellipse 1 = (((x + 8/6)^2)/((16/3)^2)) + ((y^2)/4)) Is this correct?

Precalculus
Suppose that the point (rho, theta, phi)= (12, 2pi/3, 5pi/4) in spherical coordinates can be expressed as (x, y, z) in rectangular coordinates. Find x+z. I first found x by using the conversion method (r*sin(theta)cos(phi)= x ) I got -3(sqrt(6)). Then I found z using (z= r*cos...

geometry
RECTANGULAR ARRANGEMENTS OF NO 12 AND18

physics
90,135,135

maths
(√7+√5)(√7-√5)

A bone fragment has lost 75% of its original carbon-14. What is the age of the bone fragment? My answer is about 11 000 years but I don't know if its right

math
In English Class, after studying a book called \The Lord of the Flies" by William Golding, students are split into 6 groups and each group is required to make a fi lm based on one of the 8 important scenes in the novel. Each group can choose which scene they are creating ...

Chemistry
Br2(l)+Cl2(g) (double arrow) 2BrCl(g) dH=+29.4 kJ/mol I am having trouble understanding this. Will the system shift left, right, or unchanged and why? a.Increasing Temp. b. Increasing pressure in flask by adding Ar. c. Increasing volume of flask d. Adding Br2(l)...is answer ...

english
Many schools experience disruptive and anti-social behaviour, sometimes on a daily basis. Imagine that you attend the school at which Mrs Rodriguez is the Headteacher. Mrs Rodriguez has decided to tackle bad behaviour at your school. Recently there have been some very serious ...

math
TODAY

science
How is molecular formula and emperial formula related

Geometry
520

Biology
it is very easy

Physics
A man cycles up a hill whose slope is 1in20. If themass of the man and the cycle is 150kg and the man covers a distance of 100m along the incline, calculate the work done by theman.

elocution
i want essay for college perpose

Physics
A stream of water flowing horizontally with the speed of 15m/s gushes out of a tube of cross-sectional area 10-2m2 and hits a vertical wall nerby. What is the force exerted on the wall by the impact of water assuming it does not rebound?

Physics
A ball of mass 200g strikes a rigid wall normally at the speed of 25m/s and bounces with the same speed. Time of contact of the ball with the wall is 1s. calculate the change in momentum and the force exerted by the ball on the wall?

physics
a particle is dropped under gravity from rest from a height and it travels a distane of 9h/25 in the last second. Calculate the height h?

Physics
A car moves along a circular track at 60 kmph. If the radius of the track is 300 m, calculate the acceleration towards the centre

Geometry
(C)is the right answer that two perpendicular makes four ninety degree angles

Physics
How much work is done to move a 1400 kg car from rest to 25 m/s.If this takes place over a distance of 130 m, what is the average net force?

science
the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10

science
the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10

science
the volume of nh3 at stp needed to pass into 30 ml of 1N h2so4 solution to bring down its strength to m/10

Physics
During a baseball game, a batter hits a pop-up to a fielder 82 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 6.9 s, how high does it rise? Answer in units of m.

math
Draw a triangle ABC with BC=8cm,angleB=50degrees and angleA=50degrees.A lso bisect it.

Benjamin Franklin. Well for starters they were both central figures in the American Revolutionary War and they were both writers too :)

social studies
explain briefly factors which lead to enclosures in england

tejenamentari
Math

chem.
Ok, so far this is what i've done. A. to get moles of NaOH, i multiplied 0.5062M x 0.01658L=8.39x10^-3, then i divided this number by .010L, i got .8392M B. (8.392x10^-3)x(60.052g HC2H3O2)=.5039g, after this part i got stuck.

chem.
A 10.0 mL of vinegar, an aqueous solution of acetic acid (HC2H3O2), is titrated with .5062M NaOH, and 16.58mL is required to reach the equivalence point. A. What is the molarity of the acetic acid? B. If the density of the vinegar is 1.006 g/cm^3, what is the mass percent of ...

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