Answer:
The total kinetic energy is 2.8m J. (NOTE: m is mass of the sphere)
Explanation:
The total kinetic energy of a sphere is given by the sum of the rotational kinetic energy and the translational kinetic energy. That is,

The rotational kinetic energy
is given by

Where
is the moment of inertia
and
is the angular velocity
The translational kinetic energy
is given by

Where
is the mass
and
is the translational speed (velocity)
∴ 
But, the moment of inertia
of a sphere is given by

Where
is mass
and
is radius
∴ 

Also, 
∴ 
Then,


∴ 
From the question, 
Then,



Hence, the total kinetic energy is 2.8m J. (NOTE: m is mass of the sphere)
Answer:
<h2> The refracted angle is r= 34.47°</h2>
Explanation:
According to snell's law the incident normal and refracted ray at the point of incidence all lie in the same plane
Given
incident angle i= 60°
refracted angle r= ?
index of refraction u= 1.53.
Applying the formula

solving for r

r= 34.47°
Answer:3W
If it takes an amount of work W to move two q point charges from infinity to a distance d apart from each other, then how much work should it take to move three q point charges from infinity to a distance d apart from each other?
A) 2W
B) 3W
C) 4W
D) 6W
Explanation: calculating work done,W, in moving two positive q point charges from infinity to a valued distance d from each other is
W = k(+q)(+q)/ d
k is couloumb's constant
work done in moving 3 equal positive charges from infinity to a finite distance is given by
W₂=W₄=W₆=k(+q)(+q)/ d
Total work done, W' =k(+q)(+q)/ d + k(+q)(+q)/ d + k(+q)(+q)/ d
= W + W + W = 3W
Because each case i observed happened due to the experiments that I did with my partner.
Answer: 20360 N
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