Which of the following statements are true? (select all that apply.)

a. all parts of a rotating wheel must have the same angular velocity.
b. none of these statements are true.
c. angular velocity and linear velocity have the same dimensions.
d. all parts of a rotating wheel must have the same angular acceleration

Explanation:

The correct statements are :

1. All parts of a rotating wheel must have the same angular velocity.

2. All parts of a rotating wheel must have the same angular acceleration.

We know that the rate of change of angular velocity is called angular acceleration of the wheel. It is clear that all parts of wheel must have same angular speed as well as angular acceleration.            

The dimension of linear speed,

The dimension of angular speed,

They have different dimensional formula

Hence, the correct statements are (A) and (D).

t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanatio

pe = weightxheight = 2000x1000=2,000,000joules