Abox is lifted off the floor using a spring scale. its weight is measured as 20n. the same box is then dragged up a ramp using the same spring scale. the force read on the spring scale while dragging the box up the ramp will most likely be
a) 0n.
b) exactly 20n.
c) less than 20n.
d) more than 20n.

It is d, all the other ones say incorrect answer .

When is this

'b ' is the correct conclusion.

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.