The illuminance on a surface is 3.5 lux, and the surface is 2 meters from the light source. What's the intensity of the source?

Animals have different types of respiratory systems depending on the environment of their habitat. Fish live in the water and use gills to breathe. Humans who live on land, breathe air through their lungs.

A helium nucleus contains two protons and two neutrons. The mass of the helium nucleus is greater than the combined masses of two protons and two neutrons because binding energy has been added. True False

A 6kg weight is lifted off the ground to a height that gives it 70.56j gravitational potential energy. what is its height? acecelaration due to Gravity is g=9.8m/s

Are BEVs or hydrogen fuel cell vehicles a more promising transportation technology for the future? (This is question #3 from p. 608.) Should car companies be required to produce electric cars?

Yolanda is studying two waves. The first wave has an amplitude of 2 m, and the second has an amplitude of 3 m.

Which statement best describes what Kendall can do? She can measure the volume and mass of the marble, the volume and mass of the water, and the volume and mass of the graduated cylinder.

What is the process when thermal energy is being added

Why are common measurement systems important

Describe how Bohr's model used the work of Maxwell.

Calculate the fundamental frequency of a 4 meter organ pipe that is open at both ends. assume that the temperature is 20◦c and the speed of the sound is 344 m/s. answer in units of hz.