Given that,
At 3.00 m from a source that is emitting sound uniformly in all directions, the sound level is 60.0 dB.
To find,
The distance from the source would the sound level be one-fourth the sound level at 3.00 m.
Solution,
The intensity from a source is inversely proportional to the distance.
Let I₁ = 60 dB, r₁ = 3 m, I₂ = 60/4 = 15 dB, r₂ =?
Using relation :
So, at a distance of 6 m the sound level will be one fourth of the sound level at 3 m.
The concept that we need to give solution to this problem is collision equation given by momentum conservation,
Our values are,
Then,
Part A) We can here note that the velocity for the puck is zero (there is not a velocity in that direction)
Part B ) We apply the same solution but know we note that in the collision for the Goalie the velocity is zero.
Answers:
a)
b) derived
Explanation:
Density is a characteristic property of substances and materials and is defined as the relationship between the mass
and volume
of a specific substance or material, as shown below:
This means density is inversely proportional to volume.
In addition, density is a derived unit, because is based on two basic units of the International Sistem of Units: Mass (kilograms) and Volume (cubic meters)