What is the main basis on which sociologists have classified societies in human history?

a) size of community

b) type of food

c) level of knowledge

d) subsistence technology

Magnetic poles cannot be: A) isolated B) cancelled C) relocated

A young's interference experiment is performed with blue-green laser light. the separation between the slits is 0.500 mm, and the screen is located 3.14 m from the slits. the first bright fringe is located 3.

How much force is required to accelerate a 2 kg mass at 3 m/s2

Which following options are examples of matter? A) light B) Molecules C) Feelings D) people

Define, gravitational acceleration

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?

A light ray travels inside a horizontal plate of glass, striking its upper surface at an angle of incidence of 50°. This ray is totally internally reflected at the glass-air boundary. A liquid is then poured on top of the glass.

A stationary object has no forces acting on it. True False

April swims 50 m north and then turns and swims 20 m back to the south. What is her velocity if it takes her 60 seconds?

What happens to the mass of an object when it is cooled?