Question

The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance
87 cm apart on the same axle. From the
angular displacement of 21.6◦
of the two bullet holes in the disks and the rotational speed
537 rev/min of the disks, we can determine
the speed of the bullet.
What is the speed of the bullet?
Answer in units of m/s.

Answer 1

Answer:

130 m/s

Explanation:

First use the angular displacement to find the time.

Δθ = ω t

21.6° × (1 rev / 360°) = 537 rev/min × (1 min / 60 s) t

t = 0.0067 s

Now use the distance to find the speed.

v = Δx / t

v = 0.87 m / 0.0067 s

v = 130 m/s