?

A trough 3m long has a cross section of semi-circle of diameter 1.4m. It has water to a depth of 0.4m.

a} Calculate area of wetted surface of trough?

b)The volume of the upper part of the trough with no water

c)The water in the trough is poured into laws where back area is a regular hexagon of side 30cm and height 50cm. Calculate the number of cans that can be filled.

it is chemistry

Cu(NO)2-----A------CuCO3--------B------CuSO4-----------C----------Cu(OH)2

and what physical state would you expect the compound of sodium and sulphur to be in room temperature and pressure

When 10g of the salt Na2CO3.nH2O was heated to a constant mass, 3.71g of the anhydrous salt remained. find n.

Two identical springs of constant 30N/M are used to support a load of 300N/M .

A uniform metal bar of length 150cm weighing 50N was pivoted at C and supported by the force F acting through the 120cm mark. Calculate F

A hydrocarbon with an empirical formula CH2 has a density of 1.25gdm3 at s.t.p. Find molecular formula of the compound

40cm3 of a mixture of ethane and excess oxygen were sparked, the resultant mixture was cooled to room temperature and passed through aqueous sodium hydroxide. The final volume remaining was 12cm3

five reasons

plse explain each point

Four numbers from a certain set of data are x,(x+2), (1-2x) and y. Given that their mean is x+1

A number of people working at a factory decided to raise Kshs 72,000 to buy a plot of land. Each person was to contribute the same amount. However before the contributions were collected, five of the people retired from working at the factory, this meant that the remaining people were to increase their contributions by Kshs 1,200

If the line joining point M(2,3) and N(-1,5) subtends a right angle at the point p

Show me the method

A stone is allowed to fall freely from the top of a cliff 60m high. At exactly the same moment, a second stone is thrown vertically upwards wit a velocity of 20m/s from the ground