Answer:
a) The voltage in an european house is 2,17 times greater than in an american House. That is 183 volts more than in US.
b) the number of cycles or oscillations for an US House is 60 cycles per second
Explanation:
To answer this this question you have to know the wave equation:
x(t) = A Sin (a + b.t)
where
x(t) = is the position as a time function... In this exercise we could call V(t) instead of x(t) beacause we want to know voltage vs time.
A = is the amplitude of the wave. In this case the maximum voltage that can be reached.
a = is the offset in time or number of waves (zero in this exercise)
b = constant that varies the frequency
then...
a) calculate the ratio between both amplitudes:
b) frequency (Oscillations) is:
b = 2pi/T = 2pi*F remember that: T = 1/F
where
F = frequency
T = Period
so for US household we have:
120pi =2pi*F
therefore
F = 120/2 = 60 Hertz
Answer: She could research what geologists have already discovered about the canyon.
She could hike into the canyon and make observations of the rocks in each layer.
She could compare her observations of the rock layers to other rock layers in the area.
Answer:
Approximately 
.
Explanation:
The net force on the girl would be:
.
Under the assumptions, the net force on this girl would be equal to the tension force in the rope. All other forces on the girl would be balanced.
In other words, the tension force that the rope exerted on the girl would be 
. The girl would exert a reaction force on the rope at the same magnitude (
) in the opposite direction. This force would translate to a 
force on the boy towards the girl.
Under similar assumptions, the net force on the boy would also be . Since the mass of the boy is 
, the acceleration of the boy would be:
.
<span>a. current will increase. </span>
Explanation:
Given:
y₀ = 22 m
y = 1.5 m
v₀ = 0 m/s
a = -9.8 m/s²
Find: v
v² = v₀² + 2a (y − y₀)
v² = (0 m/s)² + 2 (-9.8 m/s²) (1.5 m − 22 m)
v = -20.0 m/s
