It's one of your hands. Which one it is depends on how you sweep.
-- If you hold the top of the stick motionless and wave your bottom hand
back and forth, then your top hand is the fulcrum, and you're using the
broom as a Class-3 lever.
-- If you hold your bottom hand motionless and wiggle the top end of the
broom back and forth with your top hand, then your lower hand is the fulcrum,
and you're using the broom as a Class-1 lever.
Answer:
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
Explanation:
PLS MARK AS THE BRAINLIEST
The answer is disturbance; energy.
Waves deliver a method of transporting energy without
transporting matter. Undertaking of the particles are similar to the motion of
the energy. Sound waves touching over the air is an instance
of this kind of wave.
Answer: C, Temperature difference.