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3 years ago

Define what an astronomical unit is and explain why it is used.

Physics

2 answers:

Ivahew [28]3 years ago

5 0

Answer:

Explanation:

Astronomical units are used to measure the distances within solar system

Lunna [17]3 years ago

4 0

An AU is a unit of measurement used to measure the distance to the sun

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BIO EST The archerfish (genus Toxotes) preys on land-based insects inhabiting tree limbs above the water. It has the ability to

monitta

Answer:

The initial speed of the water droplets is approximately 14.904 meters per second.

Explanation:

We can describe the water jet from archerfish as part of parabolic motion, which consists of the superposition of two different motions. First, an horizontal motion at constant velocity and, second, a free fall motion. The maximum height is reached when vertical component of speed is zero. The equation of motion is described below:

$v^{2} = v_{o}^{2}\cdot \sin^{2} \theta + 2\cdot g \cdot (y-y_{o})$

Where:

$v_{o}$ - Initial speed of the water jet, measured in meters per second.

$v$ - Current speed of the water jet, measured in meters per second.

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

$y_{o}$ - Initial height, measured in meters.

$y$ - Current height, measured in meters.

Now we clear the initial speed within equation:

$v_{o}^{2} =\frac{v^{2}-2\cdot g\cdot (y-y_{o})}{\sin^{2}\theta}$

$v_{o} = \sqrt{\frac{v^{2}-2\cdot g\cdot (y-y_{o})}{\sin^{2}\theta} }$

If we know that $v = 0\,\frac{m}{s}$ , $g = -9.807\,\frac{m}{s^{2}}$ , $y = 10\,m$ , $y=0\,m$ and $\theta = 70^{\circ}$ , the initial speed of the water droplets is:

$v_{o} = \sqrt{\frac{\left(0\,\frac{m}{s} \right)^{2}-2\cdot \left(-9.807\,\frac{m}{s^{2}} \right)\cdot (10\,m-0\,m)}{\sin^{2}70^{\circ}} }$

$v_{o} \approx 14.904\,\frac{m}{s}$

The initial speed of the water droplets is approximately 14.904 meters per second.

3 0

4 years ago

Which of the following situations would cause the greatest increase in the motion of molecules in a system? A. The system abso

Mrac [35]

The answer is B. When the system absorbs energy, the molecules gain more kinetic energy and hence start to move faster. Doubling the size of the system also gives more room for the molecules to move randomly around the system before colliding with other molecules hence increasing their motion.

4 0

3 years ago

Read 2 more answers

What is hydroelectric power ? Answer quickly..!

GenaCL600 [577]

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Hydroelectric power, also called hydropower is the electricity produced from generators driven by turbines that convert the potential energy of falling or fast-flowing water into mechanical energy.

7 0

3 years ago

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The heat released by burning candle is an example of thermal energy

yawa3891 [41]

False the correct answer is chemical bonds instead of thermal energy

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3 years ago

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The heliocentric theory was first proposed by the astronomer

Setler [38]

Nicholas Copernicus, Greek astronomer, was the one who famously proposed the heliocentric theory -- the theory by which the sun was in the center of the solar system and the planets orbited it circularly.

Hope I helped and good luck!

5 0

4 years ago