The wavelength of a wave is the distance between
a. the rarefaction and the following compression.
b. the crest and the following trough.
c. the amplitude and the normal position.
d. two consecutive crests.

An apple is falling from a tree. disregarding air resistance, which diagram shows the free-body diagram of the force or forces acting on the apple?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.