Acertain siren radiates sound uniformly in all directions. at a distance of 17 m from the siren, the intensity level is 49 db. how many watts of power does this siren put out? the threshold of human hearing is 1.0 × 10-12 w/m2.

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

Explain what happens at the saturation point when adding salt to water at room temperature.

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate