It is correct, the action is paddling, where you move the water backwards, and the reaction is the boat moving forwards.
If the first thing that the goslings saw was a dog, they would have followed the dog as a mother.
Imprinting refers to the process of training an animal to bond with anything it sees after birth even if it is not its real mother. Lorenz first achieved imprinting in 1935 using geese which followed him as their mother shortly after they were born.
If the geese were exposed to a dog, they could also have seen the dog as their mother and followed it accordingly shortly after birth.
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B. 1520 is the difference between their weights.
#1
length of one complete wave shape is known as wavelength
#2
Frequency is defined as number of oscillations per second or number of waves passing through a point in one second.
#3
One Time period is the time to cover one complete wavelength distance by the wave
#4
relation between time period and frequency is given as

#5
Time period of simple pendulum is given as

so it depends on length of pendulum and acceleration due to gravity
#6
amplitude of the wave is the height above the axis to which particle can attain its maximum position or its maximum height on y axis is amplitude