Spammers stay away..... If you don't know then don't answer.... Anyone please answer all the questions.... Tomorrow is exam.... So please answer these correctly.... Give proper explanation with each answer.
Answers
Answer:
1) d 2) b 3) c 4) d 5) a
Step-by-step explanation:
1) Density = mass/volume
Or density = m/(πr²l)
Error in density is equal to
= 1* error in mass + 2 * error in radius + 1* error in length.
Error in mass =( 0.003/0.3 )*100 =1%
Error in radius =(0.005/0.5)*100=1%
Error in length =(0.06/6)*100=1%
Then error in calculating density = 1+(2*1)+1= 4%
2) Y = acos(wt-kx)
Therefore wt-kx is unitless.
kx = M⁰L⁰T⁰
k = M⁰L⁰T⁰ / x = M⁰L⁻¹T⁰ (Since x is distance)
3) Position of particle x = at² – bt³
Differentiate the equation with respect to x.
dx/dt = v = 2at – 3bt²
Again differentiate the above equation with x.
dv/dt = 2a – 6bt.
But according to question acceleration is 0.
2a – 6bt = 0 thus t = 2a/6b = a/3b.
4) The angle between B and B X A is 90 because B X A is a vector perpendicular to both A and B. Also the dot products of perpendicular vectors is always zero.
Hence the dot product of (B X A) . A = 0
5. As the heat capacities are equal , so m₁S₁ = m₂S₂
Let S be the specific heat of the composite body. Then,
(m₁ + m₂) S = m₁S₁ + m₂S₂ = m₁S₁ + m₁S₁ = 2 m₁S₁
S = 2 m₁S₁/m₁+ m₂ = 2 m₁S₁/ m₁ + m₁ S₁/S₂ = 2 m₁S₁S₂/m₁S₂ + m₁ S₁
= 2 S₁S₂/S₁ + S₂
Answer:
Step-by-step explanation:
