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3 years ago

How much time does it take for the ball to hit the grouns

Physics

1 answer:

Sidana [21]3 years ago

4 0

It is necessary to know that the gravity of the earth accelerates objects at a rate of 9.8 meters per second squared and then use the laws of gravitation formulated by Isaac Newton

The distance that an object travels under constant acceleration is given by the formula:

distance = 1/2 × acceleration × time2 + intial speed × time

The initial speed is zero because the balls are dropped and not thrown. Therefore, we can solve for time:

time2 = (2 × distance) / acceleration

Substituting distance = 54 meters and acceleration = 9.8 meters/second2, we get

time2 = (2 × 54 meters) / (9.8 meters/second2) = 11.0 seconds2

The square root gives:

time = 3.3 seconds

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Us your understanding of asexual reproduction to explain why is it important that organisms reproduce in a variety of ways.

valentina_108 [34]

The genetic material is identical in asexual reproduction- in order for organisms to be strong they need variety so if a disease comes, some of the species may be able to fight it off because of their varied genetics

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3 years ago

In which situation are waves transmitted?

marin [14]

Answer:

In electromagnetic waves.

Explanation:

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3 years ago

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The battery capacity of a lithium ion battery in a digital music player is 750 mA-h. The manufacturer claims that the player can

Oksi-84 [34.3K]

Answer:

The number of electrons is $6.3\times10^{21}\ electrons$

(D) is correct option.

Explanation:

Given that,

Battery capacity = 750 mA-h

Time t= 8 hours

Time t'=3 hours

We need to calculate the battery capacity

$Battery\ capacity=750\times10^{-3}\times3600$

$Battery\ capacity=2700\ A-s$

We need to calculate the number of electrons in 1 C Li

Using formula for number of electron

$n=\dfrac{1}{e}$

$n=\dfrac{1}{1.6\times10^{-19}}$

$n=6.25\times10^{18}\ electrons$

We need to calculate the number of electron in 2700 C

$2700\ C=2700\times6.25\times10^{18}=1.68\times10^{22}\ electrons$

The total number of electrons battery can deliver in 8 hours

$n=1.68\times10^{22}\ electrons$

We need to calculate the number of electron in 3 hours

Using formula of number of electrons

$n=\dfrac{n\times t'}{t}$

Put the value into the formula

$n=\dfrac{1.68\times10^{22}\times3}{8}$

$n=6.3\times10^{21}\ electrons$

Hence, The number of electrons is $6.3\times10^{21}\ electrons$

8 0

4 years ago

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When the rate of motion is the same direction the speed will decrease.<br><br> True<br> False

slega [8]

A)true is the answer

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3 years ago

What would a series circuit be used for?

igor_vitrenko [27]

Answer:

Explanation:

a series circuit would be an odd choice to power a battery or light a lamp when a direct would be much more efficient, and it's not converting types of energy, so C is the best possible answer

6 0

3 years ago