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3 years ago

World class swimmers can swim the 100 meter in about 55 seconds what is their approximate average speed

Physics

2 answers:

Mice21 [21]3 years ago

3 0

About 1.8181 meters per second

goldfiish [28.3K]3 years ago

3 0

Answer:

v = 1.82 m/s

Explanation:

As we know that average speed is defined as the total distance covered in total interval of time.

So here given that

total distance = 100 m

total time = 55 s

so here from above formula

$v_{avg} = \frac{d}{t}$

$v_{avg} = \frac{100}{55}$

$v_{avg} = 1.82 m/s$

so the average speed of the swimmer will be 1.82 m/s

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When a cold air mass replaces a warm air mass, it's called a(n) _____ front?

Anvisha [2.4K]

When a cold air mass replaces a warm air mass, this is called a cold front. Some characteristics of a called front before passing are winds coming from south or southwest area, warm temperature, falling pressure, and drizzles. When it passes, the winds are shifting, there is a sudden drop of temperature, minimum pressure followed by a sharp rise. After passing, the winds head to the west or northwest area, temperature is steadily dropping and the pressure is rising steadily.

3 0

3 years ago

Read 2 more answers

One star has a temperature of 30,000 K and another star has a temperature of 6,000 K. Compared to the cooler star, how much more

Lilit [14]

Answer:

The hotter star radiates 625 times more energy per second from each square meter of its surface

Explanation:

Temperature of the hotter star is 30000 K

temperature of the cooler star = 6000 K

From Stefan-Boltzmann radiation laws, for a non black body

P = εσA $T^{4}$

where

P is the energy per second or power of radiation

ε is the emissivity of the body

σ is the Stefan-Boltzmann constant of proportionality

A is the area of the sun

T is the temperature of the sun

The sun can be approximated as a black body, and the equation reduces to

P = σA $T^{4}$

For the hotter body,

P = σA( $30000^{4}$ ) = 8.1 x 10^17σA J/s

For the cooler body,

P = σA( $6000^{4}$ ) = 1.296 x 10^15σA J/s

comparing the two stars energy

==> (8.1 x 10^17)/(1.296 x 10^15) = 625

This means that the hotter star radiates 625 times more energy per second from each square meter of its surface

5 0

3 years ago

A 10 m long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 30 m/s when a 68

timama [110]

Answer:

v = 30.39 m/s

Explanation:

given,

mass of glider,M = 680 Kg

mass of the skydiver, m = 68 Kg

horizontal velocity,V = 30 m/s

when skydiver releases, velocity,v = 30 m/s

velocity if the glider,v' = ?

use the conservation of momentum

M V = m' v' + m v

m' = 680-68 = 612 Kg

680 x 30 = 612 x v + 60 x 30

612 v = 18600

v = 30.39 m/s

since the skydiver's speed will be the same as before release

The glider should continue to travel at 30.39 m/s since there are no external forces acting on it

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3 years ago

You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical

just olya [345]

Answer:

the total mass after chemical burn is 700 gram

Explanation:

Given data

glass mas s= 200 gram

chemical mass = 500 gram

total mass = 700 gram

to find out

what is the total mass after chemical burn

solution

we have given 200 gram + 500 gram = 700 gram

and we know here according to question that

container is sealed so total mass remain in container before burning and after burning

no air will release in seal container so

mass will be same as 700 gram

hence the total mass after chemical burn is 700 gram

3 0

4 years ago

Syncopation is when we "shift" the beat off of the strong or down beat.

BabaBlast [244]

Given what we know, the statement in this question can be considered as true, since Syncopation does in fact shift the beat off of regular rhythms.

<h3>What is Syncopation?</h3>

This is when regular beats are offset in order to disrupt the melody.
This is done purposefully.
It causes the listener a need to continue in order to hear the beat return to normal.

Therefore, given that Syncopation is defined as a shift or displacement in the rhythms or beats from something strong and normal to something that causes the listener to want the beat to go back to normal.

To learn more about Syncopation visit:

brainly.com/question/9974881?referrer=searchResults

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3 years ago