111) a?
MORE ADDED1.A beaker containing water is balanced on a pan of a common balance.A solid of specific gravity 1 and mass 5 g is tied to the arm of the balance and immersed in the water of the beaker.The scale pan with the beaker:
a)goes up
b)goes down
c)remains unchanged
d)none
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75 Answers
1cos2x=1-sin 2x
=>sin 2x=sin2x
=>sinx(2cos x - sin x)=0
=>sin x=0,or tan x=2
sin x=0 has 3 solns in [0,2Î ] out of which 0 and 2Î satisfy the eqn and Î doesnt.
tan x=2 has 2 solns in [0,2Î ]
so total we have four solutions dont we?
1abe pooch kya raha hai
answer pehle hi bata chuka hai woh
hero ban raha hai??
1arka
sat is close to planet so dist b/w sat nd centre of planet can b taken equla 2 rad of planet
nd t depends on mass of planet
so a is coorct
1bhai sun
g kya hota hai pata hai
g=GM/R2
usko woh likh
uske baad wahi expression aa jayega joh maine likha hai
answer a hi hoga
1checked from book:
if a satellite is revolving close to the surface of earth,
T=2Π√(R/g)
i wud hav agredd with what tanay said if the words "orbiting close to the planet"were not given.it has to be c then..
1v=√GM/R
nahi aata yeh toh bhad mein jao nahi samjhane wala main
Time Period=2Î R/v
=2Î R/ √GM/R
solving we get T=2Î R3/2/√GM
ab aise likh do T=2Î /√GM/R3
thoda dimag lagao ab deisity ke liye
samajh aa jayega sirf density pe depend karega
1Ya akshay me too thought it wud be c as the satellite is orbiting close to the planet..but strangely ans is given as a.the ans are wrong arent they?
1okay avinav,got it thanks.dint know that "in physics inelastic means a material that in colloquial terms is actually "highly elastic""
11.total no of solutions of cos x=√(1-sin 2x) in [0,2π] is
a)2 b)3 c)5 d)none
ans given-a but shudnt it be c?this book is confusing me now!
1YOUNGS MODULUS(Y):=STRESS / STRAIN
STRESS= FORCE/AREA
STRAIN= CHANGE IN LENGTH(x)/INITIAL LENGTH
in the q abov we r concernd abt x ...refer to #38to get value of Y
i hope u ve got this Tanay
1aise question AIEEE mein aate hain kya
itna aacha question tha yeh toh
114.which of the following halogen acids is least basic
a)HF b)HCl c)HBr d)HI
ans given a
shouldnt HI be the least basic(most acidic) among these due to the greater bond length of HI bond?plz clarify.
15.ortho and para H2 differ in
a)nuclear charge b)nuclear reaction c)electron spin d)proton spin
113.during evaporation of a liquid
a)temp of liquid rises
b)temp of liquid falls
c) temp of liquid may rise or fall depending on its nature
d)temp remains unaffected
1for question 2
convert the statement in perfect square
(x-m)^2-1
so roots must be m+1 & m-1
so
m+1< 4
m-1 > -2
so m ≡ (-1,3)
1ashish its from the book Mathematics for Aieee arihant.
not of any past year.
1okay got it now,akshay.tan x=2 wil not have a root in [Î ,3Î /2] as cos x will be -ve there and thus the lhs of the eqn wil be -ve.