Answer:
Thomson used a beam of negatively charged particles. Explanation: It was on a test i got it right.
Answer:
Speed = 7.04434 m/s
Explanation:
Given that:
The radius of the circle = 6.5 m
The expression for the calculation of circumference is shown below as:

Thus,

Time taken = 5.8 seconds.
Thus, The speed is:

So,

<u>Speed = 7.04434 m/s</u>
Answer: 
Explanation:
Given
Energy in a capacitor 
Charge 
Energy of a capacitor is given by
![E=\dfrac{1}{2}CV^2=\dfrac{1}{2}QV\quad [\text{Q=CV}]](https://tex.z-dn.net/?f=E%3D%5Cdfrac%7B1%7D%7B2%7DCV%5E2%3D%5Cdfrac%7B1%7D%7B2%7DQV%5Cquad%20%5B%5Ctext%7BQ%3DCV%7D%5D)
Insert the values

Thus, the voltage around the capacitor is 
Answer:
C. 0 J
Explanation:
When an object moves in a circle, friction provides the centripetal force. Hence, it is acting towards the centre of the circle. The displacement of the object is tangential to the circle at the point of interest. Hence, the angle between the frictional force and the displacement is 90°.
Work done is given by
<em>W</em> = <em>Fd</em> cos <em>θ</em>
where <em>F</em> is the force, <em>d</em> is the displacement and <em>θ</em> is the angle between them.
<em>W</em> = <em>Fd</em> cos 90° = 0 J
Hence, the work done by friction is 0 J.