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Yakvenalex [24]
2 years ago
11

Stretching is important prior to physical activity and a few hours after/the next day after. What does stretching accomplish whi

ch is important in preventing some injuries?
Extends muscles and limbs to their full extent.

Works those muscles now so I can take it easy during my activities and not work as long/as hard.

Creates pain now instead of later.

Extends muscles and limbs to their full extent providing increased blood flow and flexibility to prepare for physical activity.
Physics
1 answer:
Ann [662]2 years ago
3 0
The last one is correct
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-6 m/s^2

Explanation:

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A certain atom has 26 protons, 26 electrons, and 30 neutrons. It mass number is?
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The most common atom of iron has 26 protons and 30 neutrons in its nucleus. What are its atomic number, atomic mass, and number of electrons if it is electrically neutral? This atom has atomic number 26, atomic mass 56, and has 26 electrons.

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A fish swims 12.0 m in 5.0 s. It swims the first 4.0 m in 2.0 s, the next 3.0 m in 1.2 s, and the last 5.0 m in 1.8 s. What is t
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3 years ago
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A spring with force constant of 59 N/m is compressed by 1.3 cm in a hockey game machine. The compressed spring is used to accele
Furkat [3]

Answer:

The puck moves a vertical height of 2.6 cm before stopping

Explanation:

As the puck is accelerated by the spring, the kinetic energy of the puck equals the elastic potential energy of the spring.

So, 1/2mv² = 1/2kx² where m = mass of puck = 39.2 g = 0.0392 g, v = velocity of puck, k = spring constant = 59 N/m and x = compression of spring = 1.3 cm = 0.013 cm.

Now, since the puck has an initial velocity, v before it slides up the inclined surface, its loss in kinetic energy equals its gain in potential energy before it stops. So

1/2mv² = mgh where h = vertical height puck moves and g = acceleration due to gravity = 9.8 m/s².

Substituting the kinetic energy of the puck for the potential energy of the spring, we have

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So the puck moves a vertical height of 2.6 cm before stopping

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2 years ago
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