Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 53

**science**

A Boy of mass 25 kg climbs atop a playground slide of height h= 3 m. When the boy slides down the inclined board, the work done to overcome friction is 550 Joule. What is the boy’s speed before he touches the ground.

**chemistry**

1.64 L of a 4.95 M solution is diluted to form a 2.58 M solution. (Rounded to 3 sig figs) there are __________ L of the 2.58 M solution formed.

**chemistry**

concentrated aqueous sulphuric acid is 98% sulphuric acid by mass and has a density of 1.80 g/l. Volume of acid required to make one litre of 0.1M sulphuric acid solution is

**physics**

a 125 cm long string has a mass 2.0g and it is stretched with a tension of 7.0 IN between fixed support

**6th math**

3.250kilogram

**math**

what is the common ratio for this geometric series? 15 11 7 3 .5

**chemistry**

1.what is meant by atomic number of an element? 2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element? 3.an element has an atomic number of 11 and its mass number is 23?what is th...

**chemistry**

this questions are related to class9 and the academic sessions hasn't started but since i'm n IIT student we have been given a lot of assignment for the holidays and the portion has to be done. so it would be alot of help if you help me. PLEASE HELP ME I NEED IT

**chemistry**

1. name the three fundamental particles present in an atom? mention the masses of the particles in M.K.S. system? 2.what is a proton? stste its relative mass and charge? 3.how many times a proton is heavier than an electron? 4.what important information are furnished about the...

**chemistry**

1 the mass of one mole of electron is ...... mg. 2 copper(I) ions contains .......... electrons in its 3rd orbitals 3 if both K and L shells of an atom are full,what is the total number of electrons contained in them? 4 what is maximum number of electrons which can be accommod...

**chemistry**

1state relative mass and charge of an electron 2 an atom of an element X may be written as 4X^9 (a)What does the figure 9 indicate? (b)what is the number of protons in an atom X? (c)what is the number of electrons in an atoms X? (d)what does the number 4 indicate? 3 describe t...

**english**

whole history from early man to indus valley civilization.

**chemistry**

1 The size of cation is ...... and the anion is ........ than atom. 2 The removal of an electron from an atom results in the formation of a ....... the size of which is ........ than that of the atom.

**chemistry **

what is the shape of p-orbital.........

**chemistry**

Mg+2 is isoelectronic species with ................ (give 2 species)

**Physics**

In its own frame the average pi meson lives 2.60 x 10^-8s. Suppose it moves at 0.985c relative to the Earth. According to us, on Earth, what is a pi meson's average lifetime? (b) according to us, what is the pi meson;s average travel distance before decaying? (c) If time d...

**maths-probability**

The diagram shows a spinner with six numbered sections.(where it has number 2 twice, # 1 triple & # 6 once ) Some of the sections are shaded. Each time the spinner is spun it stops on one of the six sections. It is equally likely that it stops on any one of the sections. (a)Th...

**biology:plz someone help**

The heart lung machine is used so that surgeons can operate on the arteries supplying heart muscle. These arteries may be diseased. (a) Name these arteries and explain how they may become diseased. (b) suggest why a patient is put on a heart lung machine during such an opperat...

**biology:plz help**

state the name for the action of two oppposing miscles, such as the biceps and the triceps.

**biology**

humans have a double circulation system. there is a low pressure circulation and a high pressure circulation. (a) explain how the structure of the heart enables it to pump blood into two circulations at different pressures

**biology**

The heart lung machine is used so that surgeons can oprate on the arteries supplying heart muscle.the arteries may be diseased. (a) Name these arteries and explain how they may become diseased (b) suggest why a patient is put on a heart lung machine during such an operation.

**biology**

The heart lung machine is used so that surgeons can operate on the arteries supplying heart muscle. These arteries may be diseased. (a) Name these arteries and explain how they may become diseased. (b) suggest why a patient is put on a heart lung machine during such an opperat...

**physics**

Why is Tangential acceleration equal to alpha*Radius?

**maths**

from the top of a light house the angle of depression of a ship sailing towards it was found to be 30 degrees . after 10 seconds the angle of depresion changes to 60 degrees. assuming that the ship is sailing at uniform speed. find how much time it will take to reach the light...

**geometry**

In Triangle ABC, AD is median. If AB is 8, BC is 18, AD is 7, find AC

**science**

how far a science satellite should be from the earth's surface.

**maths**

cos(a+b)=m(cos(a-b) then tan a=?

**Intro to chem**

Thank you SO MUCH!

**Intro to chem**

What is the volume of 19.7g of oxygen at STP? Heres what i got but did not get the same answer..pls tell me where i am wrong! (grams to moles) 19.7g x 1 mol/ 16.00 = 1.23 mol Oxygen (Pv=nRT) looking for V 1.23 mol x 0.0821 x 273K / 1.00 atm = 27.57 CORRECT ANSWER is 13.8L!

**US History**

What are proposals for new laws called?

**math**

DRAW a line l construct a line p such that lparallel ro p is at a distance of 3.5cm from l

**Physics **

How do the initial and final horizontal velocities of a projectile compare?

**Physics**

What factors affect the period of a pendulum?

**Physics **

Thank You!!

**Physics **

How do you determine the average velocity on a position-time graph?

**Physics **

Thanks!

**Physics **

Lisa drops a stone from a wall that is 7.00m from the ground. How long is the stone in the air?

**chemistry**

When 10.g of NaCl is reacted completely with 65g of Pb(NO3)2 according to the following reaction? How much (grams) of PbCl2 can be produced? 2 NaCl + Pb(NO3)2 ----> PbCl2 + 2 NaNO3

**english**

i have to write on a topic for about 300-400 words . topic is 'IS HOMEWORK HARMFUL OR HELPFUL'

**English**

start with the word cage.make a new,two syllable word by replacing one le1tter with a different letter.

**Math**

It is a 5 digit no. ,palindrome,divisible by 4,10 digit is cube root of 1 digit,product of 100 digit and 1 digit is 54 ,sum of hundred and ones digit is 15.what is the number?

**maths**

a floor is 5m long and 4m wide. a square carpet of 3m is laid on the floor. find the area of the floor that is not carpeted

**Physics**

Hi guys, Im a bit stumped on how to solve an online physics homework problem and it's really bothering me. I have no idea how to come up with the angles or even attempt the problem and neither do my friends. We'd all really appreciate it if someone could help us. Many ...

**Math**

A bag contains 2 red, 2 blue, and 2 green marbles, Sue takes one marble at a time from this bag without looking. What is the least number of marbles Sue must take from this bag to be sure that she has taken 2 marbles of the same color? A) 2 B)3 C)4 D)6

**Math**

The product of 1000 whole numbers is 1000. What is the largest possible value the sum of these numbers can have? A)1000 B)1992 C)1993 D)1999

**Math**

In the list of numbers 1,2,3,4,5,6,7,8,9, how many of the numbers in the list are exactly 2 more than some other number in the list? A)2 B)7 C)9 D)11

**Math**

In a list of the numbers 1,2,3,4,5,6,7,8,9 how many of the numbers in the list are exactly 2 more then some other number in the list?

**Math**

What is the largest number which is both less than 2*3*5*7 and also a divisor of 2*3*5*7

**science**

what is brain

**science**

why do plants bear fruit?what are plant tissues?

**english- please help me edit**

Please help me to do my english homework.my teacher gave me a project on value of exercise.I am unable to do my homework.please help me!

**math**

216/1000

**area of circle**

In fig o is the center of circle AB- 3cm and BC -4 cm then find the area of the shaded region

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