A Cannon makes a noise, and it's echo is heard 4.5 seconds later. if sound travels at 343 m/s:

a.) how far did the sound travel?

b.) how far away is the surface it reflected off of?

If an object experiences a leftward net force, then it will accerlate in which direction

What are the fixed energies of electrons called

The electric current running through the wire coil in an electric motor exerts force directly onto A) the battery. B) an aluminum axle. C) a powerful magnet. D) a rubber insulator.

A startled armadillo leaps upward, rising 0.537 m in the first 0.220 s. (a) what is its initial speed as it leaves the ground? (b) what is its speed at the height of 0.537 m? (c) how much higher does it go? use g=9.81 m/s2.

What experiment was used to discover the charge to mass ratio of the electron as well as the electron itself?

What elements are formed only during the supernova phase of large or extra-large madd star?

When a solid A of mass 12g is completed immensedin a measuring cylinder filled with water it diplaces the same volume of water as does solidB if mass 8 what can be deduced about the densities of solid AandB

Write the energy equivalent to 300 units of electrical energy in joules

Briefly describe why these searches suggest that star-like (our planet-like) objects and black holes cannot account for all the dark matter in the halo of our galaxy.

What two units of measurement are necessary for describing speed?