A person's center of mass is easily found by having the person lie on a reaction board. A horizontal, 2.7-mm-long, 6.1 kgkg reaction board is supported only at the ends, with one end resting on a scale and the other on a pivot. A 65 kgkg woman lies on the reaction board with her feet over the pivot. The scale reads 28 kgkg . Part A What is the distance from the woman's feet to her center of mass

The energy of a photon was found to be 3.38 × 10–19 j. planck’s constant is 6.63 × 10–34 j • s. which color of light corresponds to this photon?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.

Macy always thought there were only a few hair colors blonde brown and black however when she actually began looking around she saw varying shades of these hair color what is a possible reason for so many different hair colors