Question Detail

PHY 101 PHY 101 Past Questions Objective Question

An electric fan slows uniformly from 500 rev/min to 200 rev/min in 4.0 s. Find the angular acceleration (rev/s²) and the number of revolutions made.

A −1.25 rev/s², 23.3 rev

Correct Answer

B 1.52 rev/s², 32.3 rev

C −7.25 rev/s², 27.3 rev

D 5.25 rev/s², 53.3 rev

Option A is the correct answer.

Convert to rev/s: 500/60=8.33, 200/60=3.33. α=(3.33−8.33)/4 = −1.25 rev/s². Revolutions = average speed × time = (8.33+3.33)/2 × 4 ≈ 23.3 rev.

Use rotational kinematics formulas.

Course: PHY 101

Topic: PHY 101 Past Questions

Type: Objective

Difficulty: Not specified

Question 225 of 1250

Previous Course Details Next