A car tire rotates with an average angular speed of 29rad/s.
In what time interval will the tire rotate 3.5 times?
Answer in units of sec.
Answer in m/s.
The speed of a moving bullet can be deter-
mined by allowing the bullet to pass through
two rotating paper disks mounted a distance
72 cm apart on the same axle. From the
angular displacement 32.1 � of the two bul-
let holes in the disks and the rotational speed
862 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 in revs.
The tub of a washer goes into its spin-
dry cycle, starting from rest and reaching an
angular speed of 4.2 rev/s in 4.5 s . At this
point the person doing the laundry opens the
lid, and a safety switch turns off the washer.
The tub slows to rest in 12.9 s .
Through how many revolutions does the
tub turn? Assume constant angular accelera-
tion while it is starting and stopping.
Answer in units of rev.
In the Bohr model of the hydrogen atom,
the speed of the electron is approximately
1.97 × 106 m/s.
Find the central force acting on the electron
as it revolves in a circular orbit of radius
4.72 × 10−11 m.
Answer in units of N.
39.92
To find the time interval in which the car tire rotates 3.5 times, we need to use the formula:
θ = ωt
Where:
- θ is the angle in radians
- ω is the angular speed in rad/s
- t is the time in seconds
We know that the car tire rotates 3.5 times, which means it makes 3.5 complete revolutions or 3.5 * 2π radians.
Substituting the given values into the formula, we have:
3.5 * 2π = 29t
To find t, we need to rearrange the equation and solve for it:
t = (3.5 * 2π) / 29
Now, let's calculate the value of t:
t ≈ 0.606 seconds
Therefore, the car tire will rotate 3.5 times in approximately 0.606 seconds.