How many grains of sand are there in the world

2 answers:

6 0

There are seven quintillion five quadrillion grains of sand on all the beaches of the world. The exact number is not known.

IgorLugansk [536]3 years ago

3 0

Uncountable!? because there are more than a billion grains and it is clearly impossible to count them

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A ball is thrown at the ground from the top of a tall building. The speed of the ball in meters per second is v(t)=9.8t+v0, were

EleoNora [17]

Answer:

$V_0=2.7m/s$

Explanation:

The speed of the ball in meters per second is

$V(t)=9.8t+V_0$

Where t denotes the number of seconds since the ball has been thrown and $V_0$ is the initial speed of the ball. Then:

$V(2)=9.8(2)+V_0\\\\V(2)=19.6+V_0$

If the ball travels 25 meters during the first 2 seconds after it is thrown, what was the initial speed of the ball

Also, for constant acceleration motion, the average velocity is equal to the sum of final and initial velocities divided by 2 and to the distance divided by the time:

$\dfrac{V(t)+V_0}{2}=\dfrac{d}{t}$

Where you know:

t = 2s

$V(2)=9.8(2)+V_0=19.6+V_0$

d = 25m

Substituting (the units are ommited in the equationn, but added at end of the answer):

$\dfrac{V(2)+V_0}{2}=\dfrac{25}{2}$

$V(2)+V_0=25$

Thus, you have a system of equations:

$V(2)+V_0=25$

$V(2)=19.6+V_0$

Substituting the second into the first:

$19.6+V_0+V_0=25\\\\19.6+2V_0=25$

$2V_0=25-19.6\\\\V_0=5.4/2\\\\V_0=2.7m/s$

5 0

2 years ago

How did industrialization shape the nature of and expectations about family life?

hjlf

"<em>Urbanization as more and more people moved to cities to find work. It led to our modern ideas of consumer society, as people were able to begin to choose different brands to buy, based on everything from the price, to quality, to designs, patterns, and colors. Companies began to make different models of things in order to attract more buyers, so it could be seen as the beginning of modern capitalism. It led to an increase in technology, as more and more machines were invented and used to help increase the efficiency at which products were made, leading to lower prices and more availability. Also, it was the first time that a source of power, other than muscles power (human or animal,) was used to create products. It led to a more connected world, as new technology like trains, steam engines, and railroads that were designed to more quickly transport goods, were also used to better connect people. It helped establish the industrialized nations (mainly England and America) as the dominant world powers. It would eventually lead to more rights for workers and the concept of the modern working conditions we have, although at the start this would not have been true. It helped women begin to break the cult of domesticity, as more and more young, unmarried women got jobs.</em>" according to Michael P.

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