20. EVERYONE: A 5500 kg semi-truck traveling 50 m/s to the south collides with a 1500 kg car that is initially at rest at a stoplight. The semi-truck and car stick together
and move together after the collision. What is the final velocity of the two-vehicle mass?
cts have the same momentum. Which of the following must also be true? Show your
work.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

What is the role of the ocular lens?

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.