1. An object in free fall will have an initial velocity equal to zero when: a. It is thrown vertically down

b. It is dropped

c. It's thrown up

d. It is released horizontally

A 60kg rock in on a mountain in banff national park breaks free from a ledge and falls down 500 meters to the bottom of the mountain the average air resistance is 150N what is the average acceleration of the rock?

An 18-wheeler reaches a speed of 70 mph, then slows to 60 mph. At which speed does it have the least kinetic energy?

How does Exploring the unseen activity relate to how scientists figure out what an atom looks like?

The red sphere represents a proton. What is the atomic number of this atom

Vertically polarized light is to be passed through a sequence of three polarizing filters. The direction of the polarization axis for each filter is indicated by lines drawn parallel to the axis.

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy

True or false a liquid does not have a definite shape, but it does have a definite volume.