Answer:
Explanation:
The kinematic equation
gives the final velocity of the object given the initial velocity , the acceleration , and the distance traveled .
For our case, the object is dropped; therefore,
I.e. the initial velocity is zero. The acceleration due to gravity is
,
and the distance traveled is .
Putting the values into the equation we get:
The final velocity of the object is 44.27 m/s.
Answer:
a) 3.6 N.s
b) 36 J
Explanation:
Given:
The mass of ball, m = 0.06 kg
The initial velocity v₁ = -20 m/s
final velocity v₂ = 40 m/s
Now,
The impulse is given as:
I= change in momentum
or
I = m( v₂ - v₁)
or
I = 0.06 × (40 - (-20))
or
I = 3.6 N.s
(b) work done = change in kinetic energy
W.D = ΔK.E
W.D =
on substituting the values
W.D =
W.D = 36 J
All of them are very expensive to install the machinery.
Nuclear energy has no particular negative effect while it's being
generated. But after the fuel is 'used up', and you can't get much
more energy out of it, it's still highly radioactive and dangerous to
people.
We still don't have a good, completely foolproof way to dispose of
the waste material, in a way that will protect people from it for as long
as it stays radioactive (can be thousands of years !).
The answer would be Mercury. Mercury is closest to the sun, therefore, it gets more direct heat.