Radiation is the only one that can pass through a vaccum (like space). You need a medium for conduction and convection to work. Therefore the answer is radiation.
Alpha Centauri A is about 93 million miles away from the Earth and it takes light 4.367 years to reach there.
I'll put what is happening and I'll let you put it into your own words.
Point A is emitting a sound wave that travels down into the water and finds the ship (point B). The sound wave then bounces off the the ship and travels to a receiver that is located on the back of the ship (Point C). The ship then calculates the time from the emission of the wave to the reception of the wave and from there calculates the depth of the object.<span />
Answer:
Yes, dimensionally the equation is correct.
Explanation:
This equation is the kinematic equation for uniformly accelerated motion, then we study the units of each member to conclude whether it is dimensionally correct.
vi = initial velocity [m/s]
a = acceleration [m/s^2]
t = time [s]
v = final velocity
therefore we have:
[m/s] + [m/s^2]*[t^2], the second term now is m/s
[m/s] + [m/s] = [m/s]
So the analysis is correct.
Explanation:
30km/h -->
A-----------------B
<-- 50km/h
Displacement = 0 (initial and final point are the same)
Distance=2AB
Average Speed=37.5km/h