How to start my introduction in science about the history of matter?

Rounded to the nearest whole number, how many electrons are in an atom of zirconium? 40 51 91 131

A definition of power is * O Work divided by time O Work multiplied by time O Force multiplied by mass O Force multiplied by distance

A wheel rotating with a constant angular acceleration turns through 19 revolutions during a 3 s time interval. Its angular velocity at the end of this interval is 18 rad/s.

An elephant pushes with 2000 N on a load of trees. If it takes the elephant 45 seconds to move trees 15 meters, how much power did the elephant generate?

The initial velocity of a car moving on a straight road is 2.0 m s^-1 and becomes 8.0 m s^-1 after travelling for 2.0 s under constant acceleration. What is the acceleration?

Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time.

How is Electric current able to flow?

In a series circuit, loads which have the same voltage dropped across them will have?.

When a brick is dropped from the roof of a house, it lands on the ground with a speed v. What will the speed at ground level be for an identical brick dropped from a roof twice as high as the first one?

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.