Answer:
d = 39.7 km
Explanation:
initial position of the boat is 45 km away at an angle of 15 degree East of North
so we will have


after some time the final position of the boat is found at 30 km at 15 Degree North of East
so we have


now the displacement of the boat is given as



so the magnitude is given as


First you will want to sketch out both of the situations. It should be two sketches, one for the flagpole and one for the building.
To solve this, you will want to create a proportion.
Flagpole height/flagpole shadow=building height/building shadow
Therefore, it should look like this:
50/30= 300/x
Solve for x:
50x=9,000
X= 180 feet
YOUR ANSWER IS C.
Answer:
Wavelength, 
Explanation:
Given that,
Width of the slit, 
The angle between the first dark fringes on either side of the central maximum is 34 degrees
To find,
The wavelength of the light used.
Solution,
The equation of maxima is given by :

n = 1 here




So, the wavelength of the light used is
. Hence, this is the required solution.