Aforce of 15 n is applied to a spring, causing it to stretch 0.3 m. what is the spring constant for this particular spring?

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

If anyone who can me with this hw? i would really appreciate it