What criteria might be used to establish someone as an expert witness

Ninety percent of stars in the solar system are :

The potential energy of a 60 kg man standing on a balcony 43 meters above the ground is:

Supposing you were in space ... in a weightless environment, would it require a force to set an object in motion? Explain ... it wouldn't, right? because it's in space, no gravity to pull it, or act upon it ... so it would just float?

An electric bulb is rated 220v and 100w. when it is operated on 110v, what will be its power

Explain how convections currents cause Earth's plates to move continuously

X-component is 5, and y-component is 4. what is the angle of vector?

An open train car, with a mass of 2150 kg, coasts along a horizontal track at the speed 2.83 m/s. The car passes under a loading chute and, as it does so, gravel falls vertically into it for 2.95 s at the rate of 481 kg/s.

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction?

Why does an object in motion stay in motion unless acted on by an unbalanced force? A) because forces are what stop and start motion B) because balanced forces cannot exist in nature C) because motion is the inherent state of all matter D) because

A car travels 100 meters in 4.0 seconds. find its average velocity.