Answer:
The answer is below
Explanation:
The intensity level (B) of a sound wave is given by:
B = 10log(I/I₀);
where I₀ is the threshold intensity = 1 * 10⁻¹² W/m², I is the intensity at distance 5 m, B is the intensity level = 52 dB
Substituting gives:
The pressure is given by:
Answer:
pyramid, cone, sphere, cube
I am 11 year old I just wanted to login in so I don't know the answer
1. We can use the principle of moments to ensure that there is no net moment, that is, m*g*d = M*g*l, where m is the mass of the weight, d is the distance of the weight to the pivot, M is the mass of the counterweight, l is the distance of the counterweight from pivot, and g is the gravitational constant.
2. A question that could be asked is what kind of weights is the engineer expecting the crane to lift, that would determine the counterweights used.
You need to divide the motion into its component: vertical and horizontal motion.
The time taken to fall vertically from the cliff is equal to the time taken to move horizontally.
Using the vertical component, which is an accelerated motion with an initial velocity equal to zero, we can solve for t:
h = 1/2 · g · t²
t = √(2·h / g)
= √(2·50 / 9.8)
= 3.2 s
Horizontally, it is a constant motion:
d = v · t
= 20 · 3.2
= 64 m
The ball will strike the ground at a distance of 64 meters from the cliff.