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3 years ago

Why do bones weaken as a person gets older

Physics

1 answer:

Sonbull [250]3 years ago

6 0

Answer:

The bones aren't as strong as a younger person, because an older person, ages due to time and it also depend on what they do in their past.

Does this help? ^-^"

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The reaction of H2 with F2 produces HF with ΔH = –269 kJ/mol of HF. If the H–H and H–F bond energies are 432 and 565 kJ/mol, res

ryzh [129]

Answer:

The bond energy of F–F = 429 kJ/mol

Explanation:

Given:

The bond energy of H–H = 432 kJ/mol

The bond energy of H–F = 565 kJ/mol

The bond energy of F–F = ?

Given that the standard enthalpy of the reaction:

ΔH = –269 kJ/mol

So,

<u>ΔH = Bond energy of reactants - Bond energy of products.</u>

Applying the values as:

–269 kJ/mol = [1. (432 kJ/mol) + 1. (F–F)] - [2. (565 kJ/mol)]

Solving for , The bond energy of F–F , we get:

<u>The bond energy of F–F = 429 kJ/mol</u>

5 0

4 years ago

A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The spe

Elena-2011 [213]

Answer:

10 m/s

Explanation:

The speed of a wave is given by

$v=\lambda f$

where

$\lambda$ is the wavelength

f is the frequency

For the wave in this problem,

- The frequency is given by the number of oscillations per second, so

$f=\frac{2 cycles}{1 s}=2 Hz$

- The wavelength is

$\lambda=5 m$

So, the wave speed is

$v=(5 m)(2 Hz)=10 m/s$

3 0

3 years ago

Communication definition

PtichkaEL [24]

Answer:

the imparting or exchanging of information or news.

Explanation:

4 0

3 years ago

Compounds are only formed and broken apart by blank?

ELEN [110]

I think the answer your looking for is chemical reactions

6 0

3 years ago

A ball is in free fall after being dropped. What willthe speed of the ball be after 2 seconds of free fall?

Mazyrski [523]

So, the speed of the ball after 2 seconds after free fall is <u>20 m/s</u>.

<h3>Introduction</h3>

Hi ! I'm Deva from Brainly Indonesia. In this material, we can call this event "Free Fall Motion". There are two conditions for free fall motion, namely falling (from top to bottom) and free (without initial velocity). Because the question only asks for the final velocity of the ball, in fact, we may use the formula for the relationship between acceleration and change in velocity and time. In general, this relationship can be expressed in the following equation :

$\boxed{\sf{\bold{a = \frac{v_2 - v_1}{t}}}}$

With the following conditions :

a = acceleration (m/s²)
$\sf{v_2}$ = speed after some time (m/s)
$\sf{v_1}$ = initial speed (m/s)
t = interval of time (s)

<h3>Problem Solving</h3>

We know that :

a = acceleration = 9,8 m/s² >> because the acceleration of a falling object is following the acceleration of gravity (g).
$\sf{v_1}$ = initial speed = 0 m/s >> the keyword is free fall
t = interval of time = 2 s

What was asked :

$\sf{v_2}$ = speed after some time = ... m/s

Step by step :

$\sf{a = \frac{v_2 - v_1}{t}}$

$\sf{(a \times t) + v_1 = v_2}$

$\sf{(10 \times 2) + 0 = v_2}$

$\boxed{\sf{v_2 = 20 \: m/s}}$

So, the speed of the ball after 2 seconds after free fall is 20 m/s.

8 0

2 years ago