Question

Michael tries to pick up a small bit of plastic wrap that is on his desk. Michael's hand has a negative charge. The piece of plastic has a positive charge. What will happen when Michael's hand gets close to the plastic?

The plastic will neither move towards or away from Michael's hand.

The plastic will move away from Michael's hand.

The plastic will circle around Michael's hand.

The plastic will move towards Michael's hand.

Answer 1

Explicación:

.) Sabemos que:

Ek= \frac{1}{2}m v^{2}Ek=21mv2

Como la fórmula indica masa, pasamo el peso a masa:

w=mg

19,6N=m*9,8m/s²

m=2kg

Ek= \frac{1}{2}2*10^{2}Ek=212∗102

Ek=100JEk=100J

2.) Ek= \frac{1}{2}m v^{2}Ek=21mv2

Despejamos para m:

m= \frac{2Ek}{ v^{2} }m=v22Ek

m= \frac{2*400}{ 30^{2} }m=3022∗400

m=0,889kgm=0,889kg