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➷ Refraction is the idea of light bending when it moves from a medium of one density to a medium of another density
The correct option would be "You try to pick up a shell in the water, but it isn't where it appears to be."
This is because water and air have different densities which causes the light to refract and make the shell appear elsewhere.
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The formular for calculating half life is:
T1/2=0.693/Π
Answer:
15.8 cm
Explanation:
In 20.8 seconds, the number of vibrations = 42
In 1 second, the number of vibrations = 42 / 20.8 = 2.019
Frequency is defined as the number of vibrations in one second.
f = 2.019 Hz
Crest travel 371 cm in 11.6 s
v = 3.71 / 11.6 = 0.319 m / s
Use
v = f x λ
λ = v / f = 0.319 / 2.019 = 0.158 m = 15.8 cm
The force needed to accelerate an elevator upward at a rate of is 2000 N or 2 kN.
<u>Explanation:
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As per Newton's second law of motion, an object's acceleration is directly proportional to the external unbalanced force acting on it and inversely proportional to the mass of the object.
As the object given here is an elevator with mass 1000 kg and the acceleration is given as , the force needed to accelerate it can be obtained by taking the product of mass and acceleration.
So 2000 N or 2 kN amount of force is needed to accelerate the elevator upward at a rate of .
Only velocity uses direction of travel in its calculations.