A child stands between two mirrors with his arms out, perpendicular to the mirrors. One plane mirror is 5 m away from his left h
1 answer:
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Answer:
Distance = 0.738 m
Explanation:
Solution:
<u> First convert Km/h into m/s.</u>
75 km/h * 1000 m/km * 1 hr/3600 sec = 20.8333 m/s
<u>According to third equation of motion: </u>
–
= 2 * acceleration * distance
<em> Vf= final velocity </em>
<em>Vi= initial velocity</em>
putting values in third equation of motion....
–
= 2 * (-30 * 9.8) * distance
note:
negative sign is due to deceleration
Distance = 0.738 m
Answer:
Mass, M = 4.859 Kg
Explanation:
Given the following data;
Radius, r = 0.225 m
Moment of inertia, I = 0.123 kgm²
To find the mass;
Mathematically, the moment of inertia is given by the formula;
I = ⅖Mr²
Making M the subject of formula, we have;
Cross-multiplying, we have;
2I = Mr²
Substituting into the formula, we have;
Mass, M = 4.859 Kg