Which of the following is not an example of a projectile?

question 2 options:

a baseball that has been pitched

a rock being thrown over a bridge

a person sitting in a chair, not moving

a car driving off a cliff

question 3 (10 points)
a plane is flying east when it drops some supplies to a designated target below. the supplies land after falling for 10 seconds. how high above the ground was the airplane when the supplies were dropped? (hint: d = 1/2gt2; g = -9.8 m/s2)

question 3 options:

120 meters

490 meters

980 meters

49 meters

question 4 (10 points)
as the supplies fell, they traveled 650 meters horizontally. how fast were the supplies and the airplane moving forward? remember that it took 10 seconds for them to reach the ground. (hint: v = d/t)

question 4 options:

65 m/s

6500 m/s

0.154 m/s

660 m/s

question 5 (10 points)
a projectile has a vertical component and a horizontal component.

question 5 options:
true
false
question 6 (10 points)
the shape of a projectile's trajectory is an ellipse.

question 6 options:
true
false
question 7 (10 points)
which of the following is not true about a vertical component?

question 7 options:

the vertical component of a projectile changes due to gravity.

the vertical component acts the same as an object in free fall.

the vertical component always equals the horizontal component.

2). If the person is just sitting there and not moving, then he certainly can't be a projectile.

3). The formula to use is right there under the question.  D = 1/2 g t² .               'g' is 9.8 m/s².  Write " 9.8 m/s² " in place of 'g' in the formula.  't' is 10 seconds.  Write " 10 seconds " in place of 't' in the formula.  then the formula will tell you what 'D' is, and that's the answer to Question 3.  I got 490 meters in my head, but you need to check this.

4). The formula to use is right there under the question.  v = d / t .           'd' is 650 meters.  Write " 650 meters " in place of 'd' in the formula.  't' is 10 seconds.  Write " 10 seconds " in place of 't' in the formula.  Then the formula will tell you what 'v' is, and that's the answer to Question 4.  I got 65 m/s in my head, but you need to check this.

5).  Technically, this statement is false.  The projectile does not have a vertical or horizontal component.  But the projectile's displacement, velocity, and acceleration all do.  (At least they do while it's flying.)

6).  The shape of a projectile's trajectory is a parabola.

7).  The vertical component of a projectile depends on who designed it.  The vertical components of the projectile's displacement, velocity, and acceleration are the same as the vertical components of the displacement, velocity, and acceleration of any other object in free-fall.  (If you ignore air resistance.)

mass and volume are the answers you are looking for

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.