Q1: An object is in a uniform circular motion. Which of the following statements must be
true?

it has constant angular velocity

Explanation:

an object moving in a uniform circular motion moves with constant angular velocity about a point

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

the answer is 3.1 his answer is wrong mines is right