Physics Rotational & Circular Motion PMDC 2021
PMDC Verified Question 73 of 95
If earth covers \( 360 \text{ degrees} \) in 24 hours, then how many degrees are in two hours
A
\( 15^\circ \)
B
\( 30^\circ \)
C
\( 45^\circ \)
D
\( 60^\circ \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: \( 30^\circ \)
Concept:

The Earth rotates at a relatively constant angular velocity. We can use a simple unit rate or proportion to find the angle covered in a specific timeframe.

Formula:

$$ \omega = \frac{\Delta \theta}{\Delta t} $$

Solution:

  • First, find the rate per hour: \( \frac{360^\circ}{24 \text{ hrs}} = 15^\circ \text{ per hour} \).
  • Multiply the rate by 2 hours: \( 15^\circ \times 2 = 30^\circ \).


Why other options are incorrect:

  • Option A is the angle for just one single hour.
  • Option C is for 3 hours.
  • Option D is for 4 hours.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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