Answer:
Explanation:
The solved solution is on the attach document
how many revolutions are completed by a top spinning with a constant angular velocity of 3pi radians during a 20 sec time interv
1 answer:
You might be interested in
Answer:
0.05
Explanation:
Given a variable C which is the product of two variables A, B:
Then the absolute error on C is given by:
where are the uncertanties on the measure of A, B and C, respectively.
In this problem, the horizontal component of the velocity is given by
Therefore, the uncertainty on vx is given by:
(1)
where we have:
, so
The uncertainty on is given by:
where:
and
So
Also,
So, combininb everything into (1), we find:
Answer:
It takes <em>40 hours</em> to melt the block of ice.
Explanation:
According to the principles of radiation and heat transfer respectively:
<em>ΔQ = I(dt)eAcosθ </em>(I = Solar energy density; dt = time taken; e = emissivity; A = Area of block; θ = angle between the sun ray and the horizontal)
<em>ΔQ = mLf</em> (ΔQ = Heat change; m = mass of ice; Lf = Specific latent heat of fusion of ice)
but m = ρV = ρ.A.<em>d</em>x, therefore, the heat transfer equation can be re-written as:
<em>ΔQ = ρ.A.dx.Lf</em>
Lets equate the radiation equation and the modified heat transfer equation, we have:
<em>ρ.A.dx.Lf = I(dt)eAcosθ</em>
<em>ρ.dx.Lf = I(dt)ecosθ </em>(Striking out the area)
Let's make <em>dt</em> the subject of formula,
dt = ρ.dx.Lf /I.e.cosθ
ρ = Density of ice,
Lf =
e = 0.050
θ = 32 deg. C
Now, let's substitute the terms:
Therefore, the time taken for the ice to completely melt is <em>40 hours</em> (Two significant figures)
The electric current intensity (I) is the amount of electricity or electric charge (Q) that circulates through a circuit in the unit of time (t). Mathematically it can be described as
Our values are,
Replacing we have that the charge is
Therefore the amount of electric charge transported is 0.2137 Coulombs