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

What is a personal bias?

What Causes A Short Circuit? a. When there is too much resistance and the current decreases b. When there is too much resistance and the current increases c. When there is too little resistance and the current increases d.

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

When water changes to ice, does the link up of atoms change?

Give at least two reasons today's astronomers are so interested in the discovery of additional Earth-approaching asteroids.

A stimulus with a low predictive value means that

In otherwise empty space is a system of 4 particles, each of the same mass. The accelerations of the particles are as follows: a1 = ˆi a a2 = ˆj a 2 a3 = - (ˆi + ˆj) (2 a) a4 = (ˆi - ˆj) (3 a), where a > 0 is a constant.

How many electrons does a neutral atom of oxygen-18 have? 8 O 16.00 A. 8 B. 10 C. 18 D. 16

What is average velocity?

A bicycle moves from rest to 5 m/s in 5 sec. what is the acceleration of the bicycle