The light intensity of a source in 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

A siren mounted on the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15.0 m/s.

A heat engine operates at 30% of its maximum possible efficiency and needs to do 995 J of work. Its cold reservoir is at 22 ºC and its hot reservoir is at 610 ºC.

Carl measures the temperature of the water at different depths of the lake to see if there is a relationship. Independent Variable: Dependent Variable:

For a neutral atom, the number of protons, neutrons, and electrons are all equal to the atomic number. Question 2 options: True False

What would happen if you tried to catch a ball when you were standing on roller skates?

What factors affect the speed of a wave?

What direction does air resistance act on an object that is falling straight down

How are the relationships of elements in a group different from the relationships of elements in a period?

Children in a tree house lift a small dog in a basket 4.00 m up to their house. If it takes 187 J of work to do this, what is the combined mass of the dog and basket?

What happens to the speed of the particles if the temperature is increased