Why would machine-operated stopwatches be used at sports events instead of hand-operated stopwatches?

The average distance between the Sun and a certain planet is approximately 2.3 x 1014 inches. Which of the following is closest to the average distance between the Sun and the planet, in kilometers? (1 kilometer is approximately 3.9 x 104inches.

Which statement describes a difference between electromagnetic and mechanical waves? A. Mechanical waves cannot be longitudinal, but electromagnetic waves can. B. Electromagnetic waves cannot move particles, but mechanical waves can. C.

Waves that make up the visible part of the electromagnetic spectrum have lower energy than x rays lower energy than microwaves. Higher energy than gamma rays Higher energy than UV light

What is the difference between a scientific law and a scientific theroy

In designing buildings to be erected in an area prone to earthquakes, what relationship should the designer try to achieve between the natural frequency of the building and the typical earthquake frequencies?

When a cyclist rides past you on the street, this is an example of

Why are galaxies visible

I hockey puck slides across an ice rink more easily than it does across a rough concrete surface why is this

Sodium-22 Sodium-25 # of protons # of neutrons # of electrons

As the particles of a solid undergo sublimation, they A: lose energy B: move closer to one another C: change temperature D: move farther apart from one another