Tag: unconventional units of measurements

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Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

 _______________displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

  1. Echo

  2. Parallax

  3. Triangulation

  4. None of These
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parallax displacement or difference in the apparent position of an object vied along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

A uniform metre scale is balanced at $40\ cm$ mark, when weighs of $25\ gf$ and $10\ gf$ are suspended at $5\ cm$ mark and $75\ cm$ mark respectively. Calculate weight of metre scale.(in gf)

  1. 50.5

  2. 72.5

  3. 52.5

  4. 80
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let W be the weight of the scale acting at the 50 cm mark. Taking moments about the pivot (40 cm): Clockwise moments = 10 gf * (75 - 40) cm = 350 gf cm. Counter-clockwise moments = 25 gf * (40 - 5) cm + W * (50 - 40) cm = 875 + 10W. Equilibrium: 875 + 10W = 350. This implies W is negative, suggesting the scale is balanced differently or the pivot is on the other side. Re-evaluating: 25 gf at 5 cm (35 cm from pivot) and 10 gf at 75 cm (35 cm from pivot). 25*35 = 875, 10*35 = 350. The weight W must be at 50 cm (10 cm from pivot). 25*35 = 10*35 + W*10. 875 = 350 + 10W. 525 = 10W. W = 52.5 gf.