The diagram below shows stream gradient. If a stream has a horizontal
distance of 10 km and begins at an elevation 100 m higher than where it
ends, what is its stream gradient?
Stream Gradient
Elevation
Difference
-
Horizontal Distance -
O
A. 100 m / 10 km = 10 m/km
O
B. 100 m 10 km = 1000 m/km
O
O
C. 10 km + 100 m = 110 km/m
D. 10 km / 100 m = 0.10 km/m

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave