Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. How long does the acceleration take?

Acceleration will take for 0.12 seconds.

Explanation:

Given:

Initial velocity of the blood, = 0 m/s

Final velocity of the blood, = 30 cm/s = 0.3 m/s

Distance to be considered, = 1.80 cm = 0.018 m

We have to find the time taken to covered the said distance.

Let the time taken be "t" seconds.

Equation of motion:

⇒ ...equation (i)

⇒  ...equation (ii)

Now,

Using equation (i) we can say that:

⇒

⇒

⇒            ...equation (iii)

Plugging x = 0.018 m in equation (ii).

⇒

⇒   ...breaking at^2 as (at)(t)

⇒

⇒      ...plugging at=0.3 from equation (iii)

⇒

⇒

⇒

⇒

The acceleration will take for 0.12 seconds.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.