Consider four objects, each having the same mass and the same radius:

1. a solid sphere
2. a hollow sphere
3. a flat disk in the x, y plane
4. a hoop in the x, y plane
The order of increasing rotational inertia about an axis through the center of mass and parallel to the z axis is:

1. Solid Sphere: 0.4 kg m²

2. Flat Disk in x,y plane: 0.5 kg m²

3. A Hollow Sphere: 0.67 kg m²

4. Hoop in x,y plane: 1 kg m²

Explanation:

The formulae for the rotation inertia of given shapes about z-axis are given as follows:

1. Solid Sphere: (2/5)(MR²)

2. A Hollow Sphere: (2/3)(MR²)

3. Flat Disk in x,y plane = (1/2)(MR²)

4. Hoop in the x,y plane = MR²

where,

M = mass

R = Radius

Since, it is stated that all shapes have same mass and radius. Therefore, we assume a mass of 1 kg and radius of 1 m for each shape. Hence values become:

1. Solid Sphere: (2/5)(1 kg)(1 m)²

2. A Hollow Sphere: (2/3)(1 kg)(1 m)²

3. Flat Disk in x,y plane = (1/2)(1 kg)(1 m)²

4. Hoop in the x,y plane = (1 kg)(1 m)²

Solving the values, we get:

1. Solid Sphere: 0.4 kg m²

2. A Hollow Sphere: 0.67 kg m²

3. Flat Disk in x,y plane = 0.5 kg m²

4. Hoop in the x,y plane = 1 kg m²

Therefore, it is clear from above calculations, that the order of increasing of rotational inertia of these shapes will be as follows:

1. Solid Sphere: 0.4 kg m²

2. Flat Disk in x,y plane: 0.5 kg m²

3. A Hollow Sphere: 0.67 kg m²

4. Hoop in x,y plane: 1 kg m²

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

the answer is neither ball has a charge.

because if they were both positively charged, they will repel each other.

if they were positively and negatively charged, they will seek.