<span>Slow moving vehicles must display reflective emblem at the rear to warn of their low speed.
The sign consists of a triangle and the primary purpose is to prevent any sad incident to happen, as slow moving vehicle (SMV) can cause serious accidents due to the less visibility at various times, therefore the sign must be visible enough. </span>
A water pipe freezes and cracks on a cold night. <em> (D)</em>
There are three physical changes going on in this scenario:
1). The air gets cold and dark at night.
2). The water in the pipe freezes and expands.
3). The pipe cracks.
There are no chemical changes in the description.
Answer:
The equation to finding acceleration:
F/m=a
F= 20N
m= 4 kg
A= 20/4
A=5
<u>Acceleration= 5 m/s^2</u>
My photo shows a 135 degree angle
Both intake and exhaust valves are closed during most of the power stage in a four cycle gas engine.