3 years ago

What are different ways to describe speed and velocity

1 answer:

ioda3 years ago

8 0

Speed is a constant direction of where you go, constant motion, and velocity is the displacement of a objects direction, plus the direction the object is traveling to.

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how many atoms of oxygen are there in one molecule of cardon dioxide , if the chemical formula is CO2

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2 oxygen 1 carbon

Explanation:

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3 years ago

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Which is not a step in the scientific method?

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A. Ask other people for their opinion. :)

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3 years ago

Lab number 14: sudden stops hurt newtons first law

kompoz [17]

Answer:

you want to know newtons first law here.

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An object that is at rest stays at rest or stays in motion.

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3 years ago

a ball is projected upward at time t = 0.00 s from a point on a roof 70 m above the ground. The ball rises, then falls and strik

grin007 [14]

Answer: 17.68 s

Explanation:

This problem is a good example of Vertical motion, where the main equation for this situation is:

$y=y_{o}+V_{o}t-\frac{1}{2}gt^{2}$ (1)

Where:

$y=0$ is the height of the ball when it hits the ground

$y_{o}=70 m$ is the initial height of the ball

$V_{o}=82m/s$ is the initial velocity of the ball

$t$ is the time when the ball strikes the ground

$g=9.8m/s^{2}$ is the acceleration due to gravity

Having this clear, let's find $t$ from (1):

$0=70m+(82m/s)t-\frac{1}{2}(9.8m/s^{2})t^{2}$ (2)

Rewritting (2):

$-\frac{1}{2}(9.8m/s^{2})t^{2}+(82m/s)t+70m=0$ (3)

This is a quadratic equation (also called equation of the second degree) of the form $at^{2}+bt+c=0$ , which can be solved with the following formula: