How do you calculate mass to get to net force

A crown weighs 6.40 g in air and 5.90 g when completely immersed in water. If the density of water 1 g/cm^3, find the density of the crown.

How many legs does a yeti crab have

a mass stands on a platform which vibrates simple harmonically in a vertical Direction and with a frequency of 5 Hertz. show that the mass loses contact with the platform when the displacement exceeds 10^-2.

Two oppositely charged parallel metal plates, 1.00 centimeter apart, exert a force with a magnitude of 3.60 * 10^-15 newton on an electron placed between the plates. Calculate the magnitude of the electric field strength between the plates.

Find the volume of a box with length 25 cm, height 25 cm and width 1.0 m. I know it would be 25 * 25 * 1.0 but that's not a possible answer, A) 0.625 m3 B) 6.25 x 104 cm3 C) 6.25 x 104 m3 D) 625 cm3

Two tuning forks, 254 Hz. and 260. Hz, are stuck simultaneously. how many beats will be heard?

What is a positive impact of artificial fertilizers

The coloring of the blue morpho butterfly is protective. As the butterfly flaps its wings, the angle at which light strikes the wings changes. This causes the butterfly's color to change and makes it difficult for a predator to follow.

What lunar phase would be observed from the earth, if the moon were at a 90° angle with the earth and sun?

Unbalanced contact forces between several objects would result in A. one of the objects moving B. all of the objects moving C. at least one of the objects moving and possibly all of them moving D. none of the objects moving