What is the group number of the most nonmetallic group that contains metalloids? What is the group number of the most metallic group that contains metalloids?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.