To stop a moving object with a very smal force, how the stopping time must be?

You will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. (refer to the walk-through video to locate the online lab within the online textbook).

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

Often called simply "velocity," this is the velocity of an object at a particular moment in time.