Weight is a force, so we use newtons second law which states F=ma. So the weight of a watermelon on earth is 2kg x 9.81m/s², which is 19.62N (newtons). On the moon it weighs 2 x 1.63 which is 3.26N.
The weight of the pen is 0.02 x 9.81, which is 0.1962N. If the pen is not to fall the frictional force needs to be equal to this force, so the answer is 0.1962N.
The distance traveled by the ball before hitting the ground is 7.2 m.
The given parameters:
- Angle of projection, θ = 37⁰
- Horizontal velocity, V = 20 m/s
- Height above the ground, h = 1 m
<h3>Vertical motion of a projectile;</h3>
- The vertical motion of a projectile is affected by gravity.
The time of motion of the ball is calculated as follows;
The horizontal distance traveled by the ball before hitting the ground is calculated as follows;
Thus, the distance traveled by the ball before hitting the ground is 7.2 m.
Learn more about horizontal distance here: brainly.com/question/24784992
Answer:
by determining the wavelength of the light emitted
Explanation:
The composition of the hot vaporized materials of an asteroid can be find out by the wavelength of the light emitted when the fragment material is burnt out.
Some of the asteroids that are very large do not burn completely in the atmosphere and they fall on the surface of the earth. Thus there is a possibility of radioactivity. An atom is radioactive or unstable when the forces that constitutes the nucleus are not balanced and then the nucleus have excess of energy. Thus these unstable and highly energetic nucleus will try to attain stability by ejecting protons and neutrons, or by releasing gamma rays, beta particles or positrons, etc. Thus they will radiate energy and will cause radioactivity.