Answer:
88.34 N directed towards the center of the circle
Explanation:
Applying,
F = mv²/r................... Equation 1
F = Force needed to keep the mass in a circle, m = mass of the mass, v = velocity of the mass, r = radius of the circle.
But,
v = 2πr/t................... Equation 2
Where t = time, π = pie
Substitute equation 2 into equation 1
F = m(2πr/t)²/r
F = 4π²r²m/t²r
F = 4π²rm/t²............. Equation 3
From the question,
Given: m = 0.8 kg, r = 0.7 m, t = 0.5 s
Constant: π = 3.14
Substitute these values into equation 3
F = 4(3.14²)(0.7)(0.8)/0.5²
F = 88.34 N directed towards the center of the circle
All of the following apply the third law of motion except: D. taking out ketchup from a bottle
Newton's third law of motion states that for every action there exist an equal but opposite reaction. Thus, Newton's third law of motion is a law that is generally based on action-reaction force pairs.
In Science, action-reaction force pairs make it possible for;
However, taking out ketchup from a bottle doesn't involve action-reaction force pairs and as such do not apply the third law of motion except.
In conclusion, taking out ketchup from a bottle apply the first law of motion because the ketchup was static (at rest) until an external force acted upon it, thereby causing it to pour out from the bottle.
Read more: brainly.com/question/15170643
Refraction is the change in direction of waves that occurs when waves travel from one medium to another. It is always accompanied by a wavelength and speed of change. Diffraction is the bending of waves around obstacles and openings.
Hello!
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When objects are heated, their molecules tend to vibrate fast. As they vibrate, the space between each atom increases. This keeps on happening, and the object expands until it has cooled down.
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Hope this helps! :)