Sound waves travel quickest through what do sound waves travel quickest through

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

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