# Posts by uma

Total # Posts: 27

**Chemistry**

What volume of dioxygen is required for complete combustion of 2 volumes of acetlyene gas at NTP? Ans is 5 volumes but I m not getting it....

**Physics**

Two cars of same mass are moving with velocities v1 and v2 respectively. If they are stopped by supplying same breaking power in time t1 and t2 respectively then v1/v2 is?

**science**

A body starts from rest, the ratio of distances travelled by the body during 3rd and 4th seconds is -

**algebra**

If the lengths of a pair of opposite sides of a square were tripled and the other pair were each increased by 7 cm,the new figure would be rectangle with a perimeter 96 cm find the dimensions of the original square

**D P S dehradun**

Plz calculate area. A-B=28.9 yard. B-C = 33.11 yard. C-D== 30.1 DA= 36.2 yard

**Chemistry**

a) Ammonia, an important source of fixed nitrogen that can be metabolized by plants, is produced using the Haber process in which nitrogen and hydrogen combine. N2(g) + 3H2(g) → 2NH3(g) How many grams of nitrogen are needed to produce 325 grams of ammonia? b)A 0.00100 ...

**chemistry**

In 14g of 14^C,no.of neutrons =8NA In 1g of 14C,no.of neutrons =8NA/14 1)the total no.of neutrons in 7mg of 14^C= 7/1000×4/7×6×10^20 =24×10^20 2)given mass of a neutron=mass of 1 Hydrogen atom=1 amu Mass of 24×10^20 neutrons=1×24×10^20...

**math**

A certain number has a remainder of 3 when divided by 5. That same number has a remainder of 2 when divided by 4. If "y" is an integer between 10 and 40, what is one possible value of y?

**physics**

0.2

**linear programming**

Exeter Mines produces iron ore at four different mines; however, the ores extracted at each mine are different in their iron content. Mine 1 produces magnetite ore, which has a 70% iron content; mine 2 produces limonite ore, which has a 60% iron content; mine 3 produces pyrite...

**linear programming**

Mountain Laurel Vineyards produces three kinds of wine Mountain Blanc, Mountain Red, and Mountain Blush. The company has 17 tons of grapes available to produce wine this season . A cask of Blanc requires 0.21 tons of grapes, a cask of Red requires 0.24 tons, and a cask of ...

**linear programming**

Brian Q’ Rourke, owner of The Horse & Hound Pub in Dublin, is preparing for St. Patricks Day, amd he must determine how much cider to stock. Brian sells three brands of cider on tap – Murphy’s Blackton, and red Rye. The cost per gallon (to the pub owner) of each...

**linear programming**

Brian Q’ Rourke, owner of The Horse & Hound Pub in Dublin, is preparing for St. Patricks Day, amd he must determine how much cider to stock. Brian sells three brands of cider on tap – Murphy’s Blackton, and red Rye. The cost per gallon (to the pub owner) of each...

**linear programming**

The Pyrotec Company produces three electrical products-clocks, radios and toasters. These products have the following resources requirements : Resource Requirements Cost/Unit Labor Hours/Unit Clock $7 2 Radio 10 3 Toaster 5 2 The manufacturer has a daily production budget of $...

**business**

The Pyrotec Company produces three electrical products-clocks, radios and toasters. These products have the following resources requirements : Resource Requirements Cost/Unit Labor Hours/Unit Clock $7 2 Radio 10 3 Toaster 5 2 The manufacturer has a daily production budget of $...

**physics - electrostatics**

A charged particle of mass m of 1 kg and charge q = 2 uC is thrown from a horizontal ground at an angle teta = 45 degree with speed 20 m/s. In space a horizontal electric field E = 2 x 10^7 V/m exist. Find the range on horizontal ground of the projectile thrown

**Science - physics**

A circular wire of radius R carries a total charge Q distributed uniformly over its circumference. A small length of wire subtending angle teta at the centre is cut off. Find the electric field at the centre due to the remaining portion

**3 D - geometry (direction of cosines)**

Find the angle between the lines between the lines whose direction cosines satisfy the equations l + m + n = 0 and 2mn + 3nl - 5lm =0.

**physics - Heat transfer**

A round scar of area 'A' is formed on the chest of a man of temperature 37C. The rate of heat radiated from this scar is 1% more than that from the remaining part of the body. What will be the excess temperature at this scar over other parts of the body?

**Lakshman**

A 2M box is set on top of a 12M box. There is friction beween the masses. The 12M box is pushed against a spring. The spring is compressed a distance X by a 12 M mass. The 2M box does not slide from its position on top of the 12M mass. (the two masses are at rest in respect to...

**math 101**

Each can of paint will cover 450 tiles. Augustin is painting 300 tiles in his bathroom, 675 in his kitchen, and 100 in his hallway. How many cans of paint does he need to buy?

**chemistry**

How to calculate [Co3+] in equilbrium with [co(NH3)6]3+ when 10.0 g of Co (No3)3 is dissolved in 250.0 mL of 1.00 M NH3?

**statistics**

A class consists of 50 students, 20 of them are girls and boys, 10 them are rich and remaining poor, 5 of them are fair complxioned, 3 are intelligent. What is the probability of selecting a fair complexioned rich intelligient girl?

**physics**

252.08 kg/s/s

**physics**

A thin disk, mounted on a frictionless vertical shaft of negligible rotational inertia, is rotating at 495 revolutions per minute. An identical disk (that is not initially rotating) is dropped onto the first disk. The frictional force between the disks causes them to rotate at...

**American History**

could the west have been settled with less conflict with the native americans? at what cost to people and land did the mining, ranching and farming booms come?

**grammar**

Identify the intransitive and transitive verbs in the sentence .Also give an object for the transitive verbs.1. Harsha laughed .2.My mother was having .