1. consider three objects: object a is a hoop of mass m and radius r; object b is a sphere
of mass 2m and radius ; object c is a disk of mass 3m and radius r. show work and draw
a picture.
a. which has the greatest rotational inertia?
b. which has the smallest rotational inertia?

iron would move it is magnetic there is a mag field around the current in the wire

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

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