Answer:
a) 0.147 N
b) 9.408 N
c) 9.261 N
Explanation:
The tension on the cord is the only force keeping the block in circular motion, thus representing the entirety of its centripetal force 
. Plugging in values for initial and final states and we get answers for a and b. The work done by the person causes the centripetal force to increase, and thus is the difference between the final tension and the initial tension.
Answer:
motion energy
Explanation:
motion wnergy is the sum of potential and kinetic energy
Because there’s like no metal stuff idk
I think its d because lifting it would make the chemical swish around and that will make it so you cant get the right measurement. hope this helps :)
Answer:
Given that refractive index of the material is √2. i.e. n = √2. Hence, critical angle for the material is 45°
