In order for maximum work to be done...
2 answers:
Answer:
For constant traveled distance and applied forces, apply the for parallel to the direction of the movement.
Explanation:
There are 3 components in the amount of work produced when applying a force to an object.
1. The amount of force applied
2. The distance that the object is traveled
3. The angle between the force vector and the distance vector
- To get the maximum amount of work for a constant force and distance, the force needs to be along the distance traveled
- If the angle and the distance are constant, the only way is to apply a larger force in magnitude
- If the angle and the force are constant, increasing the distance traveled will result in higher amount of work produced.
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Answer:
Line 3 has a mistake.
Explanation:
Electromagnetic waves consist of oscillations of electric and magnetic fields that oscillate perpendicular to the each other. Therefore, Line 1 is correct.
Also, the fields in an electromagnetic waves oscillate perpendicular to the direction of propagation of the wave: therefore, they are transverse waves. So Line 2 is also correct.
Electromagnetic waves, contrary to mechanical waves, do not need a medium to propagate: so, they can also travel through a vacuum. Therefore, Line 3 is wrong.
Finally, all electromagnetic waves travel through a vacuum at the same speed, called speed of light:
So, Line 4 is also correct.