which of the following is not a type of cosmic radiation? gamma-rays, x-rays, sound waves, or cosmic rays
1 answer:
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Answer:
α = 200*π rad/sec²
Explanation:
- If the disk drive revolves once every 0.05 sec, this means that the angular velocity can be expressed as follows:
- (just applying the definition of angular velocity)
- Now, it the disk started from rest, and took two revolutions to reach to full speed, assuming that the angular acceleration is constant, we can find the angular acceleration applying this kinematic equation:
- where Δθ, is the angle rotated while it went from rest to full speed, i.e., 2 revolutions, or 2*π rads.
- Replacing by the value that we found for ωf (as ω₀ = 0), we can solve for α :
The speed is 0.956 m / s.
<u>Explanation</u>:
The kinetic energy is equal to the product of half of an object's mass, and the square of the velocity.
K.E = 1/2 m
where K.E represents the kinetic energy,
m represents the mass,
v represents the velocity.
K.E = 1/2 m
1.10 10^42 = 1/2
3.26
10^31
= (1.10
10^42
2) / (3.26
10^31)
v = 0.956 m / s.