Answer:
<h2>A. a spring & B. a well dried into an aquifer.</h2>
Answer:
a)
, b)
, c) 
Explanation:
a) The capacitance of two parallel plates capacitor with dielectric is given by the following expression:

Where:
- Dielectric constant.
- Vaccum permitivity.
- Plate area.
- Distance between plates.
Hence, the capacitance of the system is:



b) The charge can be found by using the definition of capacitance:




c) The energy stored in the charged capacitor is:




Change of position and time
Answer
h = 1.12 m
Explanation:
given,
mass of the car = 2 kg
radius = 0.5 m
let h be the height of the ramp
when the car reaches at the top point
gravity = centripetal force



using conservation of energy






h = 1.12 m
hence, height of the ramp should be greater than 1.12 m so that it can complete the loop.