It’s related to sound frequency! Hope this helps!
In this situation, Superman moves faster than the asteroid. Velocity involves both magnitude and direction.
Velocity refers to a physical vector, which is defined by the magnitude and direction of a given object.
The absolute value of velocity is known as speed, and it can be calculated as the rate of change of the position of an object with respect to a point of reference.
The absolute value of velocity is always a function of time.
Learn more about velocity in:
brainly.com/question/2548537
Well we can't see the picture that the teacher has, and we have to figure out what's in the picture from some clues in the answer choices. The picture seems to show an atom with 3 protons and 3 neutrons in the nucleus, and 3 electrons whizzing around the nucleus.
If that's what's in the picture, then Mike is correct (first choice), because the atomic number shows the number of protons in all atoms. There are 3 protons and the atomic number of lithium is 3.
Second choice . . . False, because electrons are not involved in the atomic mass.
Third and fourth choices . . . both false; sadly, Joan is woefully unclear on the concepts.
The earths system includes the atmosphere, which contains all of the planet's air. These spheres are closely connected. For example, many bird (biosphere) fly through the air (atmosphere), while water (hydrosphere) often flows through the soil (lithosphere).
Hope this helped and if you need more help then just message me instead :)
Answer:
Explanation:
horizontal component of velocity of throw = 20 cos20 = 18.8 m /s
vertical downwards component = 20 sin20 = 6.84 m /s
time to displace by height 30 m = t , initial velocity u = 6.84 m /s
h = ut + 1/2 gt²
30 = 6.84 t + .5 x 9.8 t²
4.9 t² + 6.84 t - 30 = 0
t = - 6.84 ±√( 6.84² + 4 x 4.9 x 30 ) / 2x 4.9
= - 6.84 ±√( 46.78 + 588 ) / 9.8
= - 6.84 ±√(634.78 ) / 9.8
= - 6.84 ±25.2 / 9.8
= 1.87 s
horizontal displacement in 1.87 s
= 18.8 x 1.87
= 35.15 m .