Is yawning actually contagious?

1 answer:

7 0

Yes, it is indeed contagious. There are two types of yawns. One is called spontaneous yawning which happens spontaneously. The other occurs from seeing someone else yawn.

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Which pair of atoms will form a covalent molecule?

lyudmila [28]

Covalent molecules are molecules that have a sharing of electrons occurring between them, and this most commonly occurs between two non- metals. Therefore, 1 atom of oxygen and 2 atoms of hydrogen will form a covalent bond and this molecule is known as water

7 0

3 years ago

A block of mass m is initially moving to the right on a horizontal frictionless surface at a

slava [35]

Answer:

The distance that the spring compresses is:

$v\sqrt{\frac{m}{k}}$

Explanation:

<u>Kinetic and Elastic Potential Energy</u>

The kinetic energy of an object of mass m traveling at a speed v is:

$\displaystyle K=\frac{1}{2}mv^2$

The elastic potential energy of a spring of constant k that compresses a distance x is:

$\displaystyle E=\frac{1}{2}kx^2$

The block of mass m is moving at a speed v when compresses a spring of constant k. The kinetic energy will eventually transform into elastic energy, but before that, both energies will be equal. It happens when:

$\displaystyle \frac{1}{2}mv^2=\frac{1}{2}kx^2$