Physics
29.10.2020 06:23
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A stone is dropped from the top of a cliff. The splash it makes when striking the
A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 6.9 s later. How high is the cliff?
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stinematesa
4,6(25 marks)
This is provided it starts from rest:
t=6.9 u=0 a=-9.8 (acceleration due to gravity) s=?
S=ut+0.5at^2
S=0+0.5(-9.8)(6.9^2)
S=(-4.9)(47.61)
s=-233.289m (minus is because it’s below starting point)
s=233.289metres
t=6.9 u=0 a=-9.8 (acceleration due to gravity) s=?
S=ut+0.5at^2
S=0+0.5(-9.8)(6.9^2)
S=(-4.9)(47.61)
s=-233.289m (minus is because it’s below starting point)
s=233.289metres
jackblacks
5,0(38 marks)
Responder: 480 vatios
Explicación:
La potencia en un circuito eléctrico am puede expresarse como el producto si la corriente y el voltaje en el circuito.
Potencia = corriente × voltaje
Corriente dada = 4 amperios
Voltaje = 120 voltios
Potencia gastada en el circuito = 4 × 120
Potencia gastada en el circuito =
480 vatios
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