Using a shorter screw driver or a drill
Answer:
The intensity in 10-3 W/m2 at 39.3 m is
Explanation:
Given Data:
frequency=1,054 Hz
intensity=6.429 mW/m^2
distance=7.945 m.
Required:
intensity in 10^-3 W/m^2 at 39.3 m=?
Solution:
Intensity at distance r from point source which is emitting sound waves of power P is given by the following formula:
Intensity=I=
Where:
P is the power
r is the distance
The intensity in 10^-3 W/m2 at 39.3 m is
Here we deal with a lever law. It states that product of force and distance from a fixed point on a lever is equal on both sides.
F₁*d₁ = F₂*d₂
By analysing this formula we can see that applying small force on a great length equals great force on a small length.
To remove nail we need to apply certain force. If we use F₁ for this required force we can see that on other side we need to apply certain force. If we have greater arm length we need smaller force. In a crowbar arm length along which we apply force is greater than length of our arm. This leads to a conclusion that we need smaller force when using crowbar. Depending on the length of a nail it is possible that we need to apply force that is greater than force required to remove nail.
One of the last two answers
Answer:
Refractive index = 1.15
Explanation:
As we know for constructive interference of reflected light the path difference of two reflected light rays must be integral multiple of the wavelength
so here we have
now here we know that
now we have