two charges separated a distance of 1.0 meter exert a 1.0-N force on each other If the charges are pushed to a separation of 1/4
1 answer:
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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:
<em>a) The speed of Juan is 250 m/min </em>
<em>b) In that interval, he's at rest </em>
<em>c) Juan would have needed 12 minutes to run 3000 m</em>
Explanation:
<u>Distance vs Time Graph Analysis </u>
If time is on the horizontal axis, and the distance is in the vertical axis, then the slope of the graph represents the instantaneous speed of the moving object. The graph shows three different zones which reflect Juan's jogging at that morning.
a) The period between 4 and 6 minutes clearly shows Juan is moving in such a way the distance increases when time passes. The speed of the motion can be obtained by computing the slope of the line. We can locate the points (4,1000) and (6,1500). We compute the speed
The speed of Juan is 250 m/min
b) We can see between 7 and 11 minutes, Juan's distance is not changing because he stopped running. In that interval, he's at rest
c) We have already determined the speed on the first 7 minutes (the same as between 4 and 6 minutes). We know that
Where v is the speed, x is the distance, and t is the time
We need to know the time needed to travel x=3000 m at the initial speed v=250 m/min, so we solve the equation for t
Juan would have needed 12 minutes to run 3000 m