Answer: :)
1.) The Doppler effect is, the change in sound or light that occurs whenever there is motion between the source and its observer. The siren of the fire engine has a lower pitch as it moves away because the waves are now spread out causing a lower frequency and a lower pitch.
2.) Wave frequency is related to wave energy. Since all that waves really are is traveling energy, the more energy in a wave, the higher its frequency. The lower the frequency is, the less energy in the wave.
<span>The centripetal force for such an arrangement can be found through the equation Fc = mv^2/r where m is the mass of the rotating object, v is that object's velocity, and r is the radius of rotation. In this case, we know that the maximum Fc that can be tolerated by the cord is 64N. Thus we set the equation up and solve for the value of v for which Fc = 64.
64 = 0.4*(v^2)/1
64/0.4 = 160 =
v^2
v = sqrt(160) = 12.65 m/s
At any speed faster than 12.65 m/s, the cord will break.</span>
The missing value is the 'k' that should appear between '28' and 'g' .
Nobody has a mass of 28g.
My new grandson, who was born yesterday (January 29, 2019), had a mass of 4,039g at birth.
Mother and son are happy and resting comfortably today, in Kfar Tapuach, Samaria, Israel.
<h3><u>WWF in protection of Turtle eggs:</u></h3>
World Wildlife Fund (WWF) is an NGO that primly aims wildlife preservation. To protect marine turtles and avoid its poaching, WWF works through TRAFFIC, the Wildlife trade monitoring network.
Turtle eggs are highly demanded for human consumption, either raw or as expensive dishes in star rated restaurants. WWF along with TRAFFIC promotes ecotourism by raising awareness to stop preferring turtle products. It establishes and strengthens MPA's (Marine Protected areas) areas where turtle nesting is primarily observed and thus turtles are free and safe to nest, feed and migrate.
