Gravity can be described as

a. the force that moves electric charges

b. the force of attraction between two objects

c. the force that repels objects with like charges

d. an magnet force found in nature

Which of the following is example of direct observation

Which of the following is a proper unit of accerlation

What factors affect momentum * mass only velocity only both mass and velocity either mass or velocity

A meandering river is flowing in a broad, alluvial valley and the river is silt-laden but also moves sand and a small amount of gravel. The government decides to build a dam across the valley for power and flood control.

What is the universe's estimated age

How do mountins building and volcanos relate to plate motion at convergent boundaries

A 20kg box is dropped 13m. how much work is done

Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.