Which characteristics are common to most salamanders? Check all that apply.

1 answer:

5 0

They undergo internal fertilization. They lose their tails as adults. They have wet, moist skin. They have long, strong legs. They begin life with gills.

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A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground. Calculate the velocity of the acorn

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The velocity and translational kinetic energy of the acorn when hitting the ground are approximately 19 meters per second and 3 joules, respectively.

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Let suppose that the acorn is a conservative system. By Principle of Energy Conservation, we understand that initial potential gravitational potential energy ( $U_{g}$ ), in joules, which is related to initial height above the ground, is equal to the final translational kinetic energy ( $K$ ), in joules, related to the instant just before hitting the ground. Let suppose that ground has a height of zero. That is:

$U_{g} = K$ (1)

$m\cdot g \cdot h = \frac{1}{2}\cdot m \cdot v^{2}$ (1b)

Where:

$m$ - Mass, in kilograms.

$g$ - Gravitational acceleration, in meters per square second.

$h$ - Height, in meters.

$v$ - Speed, in meters per second.

If we know that $m = 0.017\,kg$ , $g = 9.807\,\frac{m}{s^{2}}$ and $h = 18.5\,m$ , then the velocity and the translational kinetic energy of the acorn just before hitting the ground is: