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Fiesta28 [93]
4 years ago
8

John stretched while his muscles were cold. Which negative effect could occur?

Physics
2 answers:
Ede4ka [16]4 years ago
5 0

Answer:

The answer for Plato is C.

Genrish500 [490]4 years ago
3 0
<h3><u>Answer;</u></h3>

C) He could injure or pull a muscle.

<h3><u>Explanation</u>;</h3>
  • <em><u>When muscles are stretched the muscle fibers are temporary lengthened. Muscles have a unique ability to undergo contraction and lengthening since they are elastic.</u></em>
  • <em><u>When the muscles are warm they are more elastic, therefore, warming up the muscles is very important for the purpose of avoiding injuries.</u></em> Ir is important to engage in moderate cardiovascular warm-up prior to stretching, which increases the blood flow to the active and thus avoiding injuries to the muscles.
  • Stretching muscles when they are cold may bring injuries or cause muscle pulls, which are painful.
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What is a galaxy? How many galaxies are there and how many stars does each galaxy hold?
Wittaler [7]
A galaxy is a large system of stars, remnants of dead stars, dust,
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Within the part of the universe that we can observe, it's estimated that
there may be as many as two trillion galaxies !

Galaxies come in all sizes.  Tiny shrimp galaxies hold no more than
a few billion stars.  Really big galaxies may hold 100 trillion stars. ( ! ! )

The galaxy we live in (the "Milky Way") is somewhere in the middle.
It's very hard to estimate the number of stars in it, because we can't
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8 0
3 years ago
Two forces Upper FSubscript Upper A Baseline Overscript right-arrow EndScripts and Upper FSubscript Upper B Baseline Overscript
Pavel [41]

Answer:

Part a)

F_A = 4.59 N

Part B)

F_B = 1.28 N

Explanation:

As we know that when both the forces are acting on the object in same direction then we will have

F_A + F_B = ma

as we know that

a = 0.554 m/s^2

m = 10.6 kg

now we will have

F_A + F_B = 10.6(0.554)

F_A + F_B = 5.87 N

Now two forces are in opposite direction then we have

F_A - F_B = 10.6(0.313)

F_A - F_B = 3.32 N

Part A)

Now we will have from above two equation

F_A = 4.59 N

Part B)

Similarly for other force we have

F_B = 1.28 N

5 0
3 years ago
A vertical spring with a spring constant of 310 N/m is mounted on the floor. From directly above the spring, which is unstrained
EleoNora [17]

Answer:

7.3cm above the compressed spring.

Explanation:

We can use the conservation energy theorem to solve this problem:

U_{1}+K_1=U_e+U_2+K_2\\m*g*h+0=\frac{1}{2}k*x^2+0+0\\\\h=\frac{k*x^2}{2*m*g}\\\\h=\frac{310N/m*(3.6*10^{-2})^2}{2*0.28kg*9.8m/s^2}\\\\h=0.073m

The block was dropped 7.3cm above the compressed spring.

8 0
3 years ago
These UV photons can break chemical bonds in your skin to cause sunburn—a form of radiation damage. If the 305 nm radiation prov
astraxan [27]

Answer:

energy = 391.902 kJ /mol

Explanation:

given data

wavelength = 305 nm = 305 ×10^{-9} m

to find out

average energy

solution

we know speed of light is 3 ×10^{8} m/s

so we find frequency here first by speed of light formyla

speed = wavelength × frequency

3 ×10^{8}  = 305 ×10^{-9} × frequency

frequency = 9.8360 ×10^{14} s^{-1}

so energy is

energy = hf

here h = 6.62 ×10^{-34} J-s

so

energy =  6.62 ×10^{-34}  × 9.8360 ×10^{14}

energy = 6.51 ×10^{-14} J

so

energy = 6.51 ×10^{-14}  × \frac{6.02*10^23}{1000} kJ/mol

energy = 391.902 kJ /mol

7 0
4 years ago
Use the drop-down menus to answer the questions.
Softa [21]

Answer:

Use the drop-down menus to answer the questions.

Which fossil is the oldest?

✔ trilobite

Which fossil is the youngest?

✔ ammonite

Explanation:

ye

6 0
3 years ago
Read 2 more answers
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