4 years ago

What is physics? Why is it important in our life

Physics

2 answers:

-Dominant- [34]4 years ago

8 0

Answer:

It helps us to know or be aware of some things that happen regular and teaches us about laws that guide us

Luda [366]4 years ago

4 0

Answer:

Physics is a branch of science which deals with the scientific study of the properties of matter and energy ( heat , light , sound, gravity , magnetism , etc. ) and the relationship between them .

hope , it helps !

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3 years ago

An electric field of 6.1x 10^5 N/C is directed along a charge 2.9 x 10^-19 C. What

Aloiza [94]

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3 years ago

A ball of mass 4.5 kg moving with speed of 2.2 m/s in the +x-direction hits a wall and bounces back with the same speed in the x

Levart [38]

Answer:

The change of the momentum of the ball is $-19.8\, \frac{mkg}{s}$

Explanation:

We should find $\varDelta\overrightarrow{p}=\overrightarrow{p_{f}}-\overrightarrow{p_{i}}$ (1)with $\overrightarrow{p_{i}}$ the initial momentum and $\overrightarrow{p_{f}}$ the final momentum. Linear momentum is defined as $\overrightarrow{p}=m\overrightarrow{v}$ , using that on (1):

$\varDelta\overrightarrow{p}=m \overrightarrow{v_{f}}-m \overrightarrow{v_{i}}$ (2)

It's important to note that momentum and velocity are vectors and direction matters, so if +x direction is the direction towards the wall and the -x direction away the wall $\overrightarrow{v_{i}}=+2.2\, \frac{m}{s}$ and $\overrightarrow{v_{f}}=-2.2\, \frac{m}{s}$ so (2) becomes: