Answer:
hi the question isn't obvious and need a photo I guess
Answer:
The kinetic energy decreases, and gravitational potential energy increases.
Explanation:
The rollercoaster will slow down as it goes up the hill, so kinetic energy should not increase.
High Pitch sounds have relativity large frequency and small wavelength
When all parts of a circuit are composed of conducting materials,
then it's possible for current to flow in the circuit, and we say that
the circuit is "closed".
Answer:
Explanation:
We know that for a capacitor 
, where <em>Q </em>is the charge of one plate, <em>C</em> the capacitance and <em>V</em> the potential between the plates.
We also know that 
, since 
is the surface charge density and <em>A</em> the area of the plate (both equal in our case).
Putting all together:
Which for our values is:
Where we notice that the S.I. units combination FV/C must not have units (we can verify it directly from their definitions or we notice that 
is enough to describe an area).
