The hammering on a train track is often heard twice by workers farther down the track; first as the sound travels through the steel and second as the sound travels through the air. Which graph is true

How would one be able to travel in time?

Who was the first to study the heavens through a telescope?

This diagram of the first right-hand rule relates which two quantities? A. current (thumb) to magnetic field (fingers) B. magnetic field (thumb) to current (fingers) C. current (thumb) to force (fingers) D. force (thumb) to current (fingers)

Which description correctly explains the malleable property of metals? a Metals are malleable because they are shiny b Metals are malleable because they are brittle c Metals are malleable because they can be drawn into wire d Metals are malleable

7. Thermal energy is the a material. of the particles in A. total energy B. kinetic energy C. temperature D. potential energy

What is the potential energy called that is associated with objects that can be stretched

Which of the following is not a current use of radioisotopes? medical diagnosis sterilization of equipment detection of leaks in building structures light fixtures

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a

What is Nothing. (sorry i have been wondering this for a very long time)