Which item is an example of a lever?

1. scissors

2. a screw hammered in the wall

3. a flagpole

4. the slope of a hill

5. a knife

Descriptive investigations involve collecting data about a system, but not making observations.

All of the following are examples of mechanical energy except

Power can be expressed 1. in joules per watt, or in newtons per second 2. in joules per second, or in watts 3. in joules, or in newton-meters

How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?

Using evidence, why are cars with frames, that can crumple, less safe than rigid cars with frames?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have