A. Refraction
This is because refraction occurs when a beam of light passes from one material into another material.
Your answer would be
D. Gasoline-powered cars are better for past acceleration and traveling at high speeds.
I just took this quiz and can confirm this is the correct answer!
Hope this helps :)
The sound is perceived as louder if the amplifier increases, and softer if the amplitude decreases.
I think the best way to answer to this kind of question because some of the elements are missing specially the mass of the book is just states the variables and assigned as the mass of an object. So the initial velocity of an object starts at zero and increase rapidly by 9.8 m/s^2 because it is due to gravity
Answer:
The pulling force that the man should apply to create an upward acceleration of 
is 
Explanation:
Hi
As it shows in the drawing at the end, we have that the total mass of the man plus the platform is 
, then the force downward 
is 
.
Due the man needs to do a pulling force upward capable of lifting himself and the platform with an acceleration of , this force should create an acceleration greater than gravity by . then 
. Therefore the force should be 
.
Finally, as we have a pulley arrangement connected to the platform, it gives the man a mechanical advantage, so he has to do only half of that upward force
, therefore 
.
