m = mass of the person bouncing = 78 kg
k = spring constant of the bathroom scale = 1.5 x 10⁶ N/m
v = maximum velocity of the person
A = maximum compression of the spring of scale = 0.115 cm = 0.00115 m
h = height gained at maximum speed = A = 0.00115 m
Using conservation of energy
spring potential energy = kinetic energy + gravitational potential energy
(0.5) k A² = (0.5) m v² + m g h
k A² = m v² + 2 m g h
(1.5 x 10⁶) (0.00115)² = (78) v² + 2 (78) (9.8) (0.00115)
v = 0.0538 m/s
The electric field between the plates is equal to the potential difference across the plates divided by the separation of the plates.
The potential difference across the plates is equal to the charge stored divided by the capacitance.
Answer:
C: A lighthouse on a nearby island
Explanation:
Since the ship is in the water, therefore it is in motion compared the reference point "a lighthouse on a nearby island". This is because this reference point is stable and doesn't move and can also be seen from long distance.