When air is heated its density compared to the surrounding air, and this causes the heated air to
A increases, sink
B. increases, rise
C. decreases, rise
D. decreases, sink

Which feature of a heating curve indicates a change ofn state

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n