Indeed because some leave headlights off and ignore that fact since there are street lights around.
Hi there!
If they are in opposite direction:
- Let UP be the POSITIVE direction and DOWN be the NEGATIVE direction.
Thus:
∑F = 114.6 - 70.7 = 43.9 N upward
If they are in the SAME, downward direction:
∑F = -114.6 - 70.7 = -185.3
The magnitude is the absolute value, so:
|-185.3| = 185.3 N downward
Gas, because it's particles are not very close to each other when compared to the other two.
Well, that's not actually "diffraction".
The fuzzy edge of the moon, and the added glow that's sometimes seen
around it, are all effects caused by the light passing through air before it
reaches you.
This gives you some idea of why astronomers go to such effort and
expense to get their telescopes above as much of the atmosphere as
possible ... placing all serious observatories on mountaintops, and even
putting telescopes in orbit. It's all because the air does such a job on the
light that's trying to shine through it. We have to make do with whatever's
left over after that.
Answer:
The forces that do non-zero work on the block are gravity and normal reaction force
Explanation:
In this question we have given,
mass of the wooden block,![m=1.95 kg](https://tex.z-dn.net/?f=m%3D1.95%20kg)
angle between ramp and horizontal surface, ![\alpha =54.3^o](https://tex.z-dn.net/?f=%5Calpha%20%3D54.3%5Eo)
in this case ramp is friction less so friction force will be zero and hence work done due to friction force will be zero.
As wooden block is sliding down due to gravity(gravity is pulling the block in downward direction).
so two forces will act on wooden block as it slides down the ramp that are gravity and normal reaction force.
Therefore, the forces that do non-zero work on the block are gravity and normal reaction force.