It's a longitudinal wave surely because information passes parallel to the direction of travel or something like that?
Answer:
Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace amounts of other gases, and water vapor. This mixture of gases is commonly known as air. Explanation:
Answer:
Explanation:
<u>Conditions for Equilibrium</u>
There are three forces applied to Bethany: T1 to the right making an angle of 30° with the ground, T2 to the left making an angle of 45° with the ground, and the weight W down the y-axis. Since the system is assumed to be at rest, the forces must be in equilibrium.
Please refer to the image below.
In the y-axis:
The projections of the tensions in the vertical direction are
Thus, replacing into the first equation:
Now for the x-axis
The components of T1 and T2 in the horizontal direction are
Replacing
Solving for T1
Replacing in [1]
Computing the trigonometric values and simplifying
Solving
And therefore
To calculate for the average speed, we simply divide the total distance covered by the time it takes to travel that distance. In this case, we simply divide 7.5 km with 45 min. Therefore, the skier's average speed is 0.1667 km/min. Hope this helps.