In the image below, a worker is pushing a crate with a mass of 20 kg up a
ramp at a constant rate. Ignoring friction, how much force must the worker
apply so that the crate continues to move at the same speed? (Recall that g=
9.8 m/s2)
Weight

Aparticle with mass 1.81×10−3 kg and a charge of 1.22×10−8 c has, at a given instant, a velocity v⃗ =(3.00×104m/s)j^. what are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field b⃗ =(1.63t)i^+(0.980t)j^?

Which articulations allow for greatest range of motion?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?