Which is the correctly balanced equation for the reaction of rust, fe2o3, and hydrochloric acid, hcl? a. fe2o3 + hcl → fecl3 + h2o b. fe2o3 +3 hcl → 2 fecl3 + h2o c. fe2o3 + 6 hcl → 2 fecl3 + 3 h2o d. fe2o3 + 3 hcl → 2 fecl3 + 3 h2o

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

What is a carrier wave and how does it affect what you hear on the radio

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.