Which of the following are non-contact forces: friction, electrostatic force, magnetic force, gravity?
2 answers:
You might be interested in
<h2>The intensity of siren is 0.015 W m⁻²</h2>
Explanation:
The intensity of sound is inversely proportional to the square of distance between source and the observer .
Thus Intensity at a distance 25 m is I₁ ∝ I
Similarly the intensity at a distance 50 m is I₂ ∝ II
Dividing II by I , we have
=
=
=
Thus I₂ = x 0.06 = 0.015 W m⁻²
Answer:
Explanation:
From the exercise we know the final x distance, the angle which the projectile is being released and acceleration of gravity
From the equation of x-position we know that
Solving for
(1)
Now, if we analyze the equation of y-position we got
At the end of the motion y=0
Knowing the equation for in (1)
Solving for t
Now, we can solve (1)