He main boat is sending some wave that is reflected back to the sender when it collide with an object ( the frequency differs which is an indication of the distance separating the sender and receiver)
Answer:
D. An alloy of iron and carbon
Explanation:
Because iron and carbon are both pure substance.
Voltage is additive in series. The voltage drop across each load is added to equal the total voltage.
To solve this problem it is necessary to consider two concepts. The first of these is the flow rate that can be defined as the volumetric quantity that a channel travels in a given time. The flow rate can also be calculated from the Area and speed, that is,
Q = V*A
Where,
A= Cross-sectional Area
V = Velocity
The second concept related to the calculation of this problem is continuity, which is defined as the proportion that exists between the input channel and the output channel. It is understood as well as the geometric section of entry and exit, defined as,
Our values are given as,
Re-arrange the equation to find the first ratio of rates we have:
The second ratio of rates is