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3 years ago

The world record for the women's 100 m dash was set by Flo Jo (Florence Griffiths-Joyner) in

1 answer:

7 0

Florence Griffith-Joyner recorded a time 10.61 seconds (wind reading +1.2) in the final at the 1988 U.S. Olympic Trials the wind reading for this race is not in doubt, and the performance should be the official IAAF women's 100-m world record

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A Balloon is filled with water inside, when it is hanged over a burning fire the balloon filled with water doesn't brust why??

GaryK [48]

Answer:

The water filled balloon does not burst because the rubber obviously does not reach a temperature sufficient for it to melt or burn. The rubber is stretched thin so that heat is quickly transferred into the balloon. With air inside the balloon, this heat is not readily dissipated away from the spot touching the flame.

6 0

3 years ago

What was the result of the Mexican army's victory over the Texan garrison at the Alamo?

Nezavi [6.7K]

Answer:

The fallen defenders became heroes to the cause of Texan independence.

Explanation:

6 0

3 years ago

A ball is spun around in circular motion such that it completes 50 rotations in 25 s. What is the frequency of its rotation? 2.

Elis [28]

Answer:

1. $f = 2 Hz$

2. $f = 0.011 Hz$

3. $f = 0.067 Hz$

4. $t = 4 s$

Explanation:

1. The frequency of rotation is given by:

$f = \frac{\omega}{2\pi}$

Where:

ω: is the angular speed = 50 rotations (revolutions) in 25 s.

We need to convert the units of ω.

$\omega = \frac{50 rev}{25 s}*\frac{2\pi rad}{1 rev} = 4\pi rad/s$

Now, the frequency is:

$f = \frac{4\pi rad/s}{2\pi} = 2 Hz$

2. The frequency is:

We know:

5 laps = 5 revolutions

t: time = 450 s

$f = \frac{\omega}{2\pi} = \frac{\frac{5 rev}{450 s}*\frac{2\pi rad}{1 rev}}{2\pi} = 0.011 Hz$

3. The frequency of the pendulum is:

$f = \frac{\omega}{2\pi} = \frac{\frac{1 rev}{15 s}*\frac{2\pi rad}{1 rev}}{2\pi} = 0.067 Hz$

4. We have:

θ: number of revolutions = 48 rev

f = 12 Hz

t =?

The time can be calculated as follows:

$f = \frac{\omega}{2\pi} = \frac{\theta}{2\pi t}$

$t = \frac{\theta}{2\pi f} = \frac{48 rev*\frac{2\pi rad}{1 rev}}{2\pi*12 Hz} = 4 s$

I hope it helps you!

4 0

3 years ago

A farmer with 600 ft of available fencing wants to enclose a rectangular are located adjacent to a farmhouse (with no fencing re

Goshia [24]

Answer:

The corresponding dimensions will be "x = 300 & y = 60".

Explanation:

Available fencing = 600 ft

Fencing,

⇒ $5y+x=600$

⇒ $x=600-5y$

As we know,

⇒ $Area =xy$

On substituting the given values, we get

$=(600-5y)y$

$=600y-5y^2$ ...(equation 1)

On differentiating with respect to y, we get

⇒ $\frac{dA}{dy} =600-10y$

$0 = 600-10y$

$600=10y$

$y=\frac{600}{10}$

$y=60$

On putting the values of y in equation 1, we get

⇒ $600(60)-5(60)^2$

⇒ $600(60)-5(3600)$

⇒ $36000 - 18000$

⇒ $18000$

Dimensions of the rectangular area:

x = 300

y = 60

3 0

3 years ago

An archer releases an arrow toward a target. The arrow travels 170 meters in 2 seconds. What is the speed of the arrow?

Anastaziya [24]

Answer:

if its arrow from netflix it will never miss if its robin hood he will get your wallet count if its eagle eye from avengers he will never miss either but will get you with a tricky arrow

8 0

3 years ago