2. Suppose you are on an elevator accelerating upwards. You feel as if your weight has:
1 answer:
You feel your weight has a) increased
Explanation:
There are two forces acting on you when you are standing on the elevator:
- The force of gravity (weight), given by
(where m is your mass and g the acceleration of gravity), acting downward
- The normal reaction exerted by the floor of the elevator on you, N, acting upward
Therefore, we can write Newton's second law applied to this situation as:
where is the acceleration of the elevator (positive since it is upward).
The weigth that you feel is actually the magnitude of the normal force exerted by the floor on you, N. Re-writing the equation,
Here for the convention used, both g and a are positive: this means that the normal reaction is actually larger than your real weight,
so, you feel that your weight has increased.
Learn more about forces and weight:
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=
P₁ and P₂ are the initial and final pressures.
V₁ and V₂ are the initial and final volumes.
T₁ and T₂ are the initial and final temperatures.
Given values:
P₁ = 475kPa
V₁ = 4m³, V₂ = 6.5m³
T₁ = 290K, T₂ = 277K
Substitute the terms in the equation with the given values and solve for Pf:
Answer:
18.1 V
Explanation:
The electric field between two parallel plates is given by the equation:
where
is the charge surface density
is the vacuum permittivity
For the plates in this problem,
So, the magnitude of the electric field is
Now we can find the potential difference between the plates, which is given by
where
d = 8.0 cm = 0.08 m is the separation between the plates
Substituting,