When force is fixed, does an increase in mass increase or decrease acceleration?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

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

The strong nuclear force acts over a small distance than the electrostatic force. true or false