Zeros the left of the decimal but still less than one are non significant but to the right they are.
For example: 0.003 (only 3 is significant) but for 0.030 (two are significant)
Answer:4.7N
Explanation:both of the sides are equal
Answer:
2.38732 rpm
1.22625 rad/s²
163.292°
Explanation:
g = Acceleration due to gravity = 9.81 m/s²
a = Acceleration = 
d = Diameter of wheel = 2 m
r = Radius of wheel = 
v = Speed of elevator = 25 cm/s
Angular speed is given by

The angular speed of the wheel is 2.38732 rpm
Angular acceleration is given by

The angular acceleration of the wheel is 1.22625 rad/s²
Angular displacement is given by

The angle the disk turned when it has raised the elevator is 163.292°