Why do the lighter isotopes disappear first from the atmosphere? Where do those isotopes go?
1 answer:
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1. Answer: Option C
Displacement is a vector quantity. It has both magnitude as well as direction. Hence, it can be positive, zero or negative. In the given question, downward direction is taken as negative. This we have come to know from the downward acceleration . The negative sign indicates that downward direction is considered negative.
Now, since the object is dropped from the top. The displacement should be negative, because the negative represent a downward direction.
2. Answer: velocity
The truck is travelling at 30 mph to the west. From the unit mph (miles per hour), we know its a magnitude of velocity. West indicates the direction. Hence, the given quantity is a vector -velocity.
It is not speed because speed only indicates the magnitude and not the direction. speed is a scalar quantity.
Answer:
Explanation:
Given
See attachment for connection
Required
Determine the time constant in (b)
First, we calculate the total capacitance (C1) in (a):
The upper two connections are connected serially:
So, we have:
Take LCM
Cross Multiply
Make the subject
The bottom two are also connected serially.
In other words, the upper and the bottom have the same capacitance.
So, the total (C) is:
The total capacitance in (b) is calculated as:
First, we calculate the parallel capacitance (Cp) is:
So, the total capacitance (C2) is:
Take LCM
Inverse both sides
Both (a) and (b) have the same resistance.
So:
We have:
Time constant is directional proportional to capacitance:
So:
Convert to equation
Make k the subject
Make T2 the subject
Substitute values for T1, C1 and C2
Hence, the time constance of (b) is 0.592 s
