Homework Help > Entrance Exam > JEE main
Ask questions which are clear, concise and easy to understand.
a projectile is projected from angle of prism at an angle alpha and it crosses the prism and reach exactly edge of the bottom.if alpha and beta are angle of prism then show that tan teta is equal to tan alpha plus tan beta

Answers:
If f^{1 }exist if f is
A) one to one function
B) surjective
C) bijective
D) into

Answers:

The answer is option A and B
Thanks (0)
1. The maximum value of 10x5x^{2}1 is

Answers:

4
Thanks (0)
Hello . My doubt is that I want solution ( How to solve it , stepbystep) of the following Question : " if (Alpha)+(Beta)=3 and (Alpha)(Cube)+(Beta)(Cube)=7 , then (Alpha) and (Beta) are roots of equation "........................ .I hope that you would reply me soon .

Answers:
Give a proper explanation that why tennis ball bounces higher on hills. than in plains

Answers:

As from the equation of motions for free fall we have
v^{2}u^{2}=2gh ( at peak point v = 0)
therefore, u^{2} = 2hg
h = u^{2}/2g
As from the above equation h is inversely proportional to g and g on mountains is less from the surface
hence tennis ball bounces more on the mountains than on the plains.
Thanks (1)
What is rumination simple way

Answers:

Rumination is the process by which the cow regurgitates previously consumed feed and masticates it a second time. The ruminant stomach has four compartments: rumen, reticulum, omasum, and abomasum.
Thanks (1)
Two element A of atomic weight 75 and B of atomic weight 16 combine two yield a product the percentage by weight of A in the compound was found to be 75.08 the formula of compound is
Answer A2B3

Answers:

Element Percentage by weight Atomic weight Relative no. of atoms Simple ratio A 75.8 75 75.8/75 = 1.01 2 B 24.2 16 24.2/16= 1.51 3 Therefore the formula of the compound is A_{2}B_{3}.
Thanks (0)
8 gram of sulphur are burnt to form a SO2 which is oxidised by CL2 water the solution is treated with bacl2 solution the amount of baso4 precipitated is
Answer 0.25mol

Answers:

{tex}S+O_2 \to SO_2 \xrightarrow{Cl/H_2O} H_2SO_4 \xrightarrow{BaCl_2} BaSO_4{/tex}
From the above reaction
1mole of S produces 1 mole of BaSO_{4} Number of moles in 8g of S = 8/32 = 0.25 Thus number of moles of BaSO_{4 }= 0.25
Thanks (0)
2 moles of mixture of co and co2 requires exactly 56 gram KoH in the solution for complete conversion of all the co2 into K2co3. How much amount more of koh will be required for conversion into k2co3 if 2 moles of mixture is completely oxidized to co2?
A 28g
B 56g
C 168g
D 112g

Answers:
The volume of chlorine at STP required to liberate all the bromine and Iodine present in 1 mole of KI and 2 moles of MBR2 is ?
A 22.4
B 56
C 44.8
D 33.6

Answers:
4 gm of carbon is heated with 8 gm of sulphur .how much cs2 will be formed when the reaction is complete . What will be the % purity?
A 70.2%
B 79.2%
C 90%
D 90.2%

Answers:

B. 79.2%
{tex}C + 2S \to CS_2{/tex}
Ideally, 1 mole of C will react with 2 moles of S to form CS_{2}
1 mol of C = 12g 1 mol of S = 32g
12g carbon reacts with = 64g of Sulphur 1g carbon reacts with = {tex}64\over 12{/tex}g of Sulphur
4g carbon reacts with = {tex}{64\over 12}\times 4 = {64\over 3}{/tex}g of Sulphur
But we have only 8g of sulphur
It mean sulphur is limiting agent.
due to sulphur is limiting reagent reaction will proceed according to sulphur .
64g sulphur formed = 76g CS_{2}
1g S formed= {tex}76\over 64{/tex} g CS_{2}
8g S formed = {tex}{76\over 64 }\times 8 = 9.5{/tex}g CS_{2}
Hence, % purity {tex}= {Wt. \ of \ product \over Wt. \ of \ reactants } \times 100{/tex} = {tex} {9.5 \over (4+8)}\times 100 ={ 9.5\over 12}\times 100 {/tex}
= 79.16 % = 79.2 %
Thanks (0)
Consider the ground state of Cr atom the number of electrons with the azimuthal quatum numbers l=1 and 2 are respectively? .........provide best concept material for atomic structure! !!

Answers:
1) what is meant by green revolution and blue revolution?
2) Co (or )co2 which one of them is not a green house gas ?

Answers:

The Green Revolution was a period when the productivity of global agriculture increased drastically as a result of new advances. During this time period, new chemical fertilizers and synthetic herbicides and pesticides were created. The chemical fertilizers made it possible to supply crops with extra nutrients and, therefore, increase yield.
The term "blue revolution" refers to the remarkable emergence of aquaculture as an important and highly productive agricultural activity. Aquaculture refers to all forms of active culturing of aquatic animals and plants, occurring in marine,or fresh waters.
Carbon monoxide (CO) is only a very weak directgreenhouse gas, but has important indirect effects on global warming. Carbon monoxide reacts with hydroxyl (OH) radicals in the atmosphere, reducing their abundance. So, carbon monoxide is not a green house gas.
Thanks (1)
Difference between epimers and annomers?

Answers:

Ans.
 Epimers are monosaccharides that differ in chirality at only one carbon.
 Anomers are special epimers; in cyclic forms of one single monosaccharide.
Thanks (1)