Which is an important step in how an electric motor uses magnetic force to produce motion?
2 answers:
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Answer:
m = 4.0 Kg
Explanation:
- Using an analogy with the Newton's 2nd law for point masses, for rigid bodies, the external net torque on a rigid body, is equal to its rotational inertia (I), times the angular acceleration (α) of the body, as follows:
- Since the magnitude of the torque is the product of the value of the force times the perpendicular distance between the line of action of the force and the axis of rotation, and the force is tangential to the rim of the disk, we can write the following expression:
- For a solid disk, the rotational inertia regarding an axis through its center, and perpendicular to its face is as follows:
- Replacing (3) in (1), and (2) in the left side of (1) also, we can solve for m, as follows:
- So, the mass of the disk is 4.0 Kg.
Answer:
v=30 m/s
Explanation:
h - height
g - acceleration due to gravity=10
t - time
v- velocity
45 = 5t²
t² = 9
t=3 seconds
v=g×t
v=10×3
v=30 m/s