Why does a small piece of steel rod sinks while a large steel oil tanker floats? Plss help thanks! pls include EXPLANATION and EXAMPLES that I can proof to people that has 0 knowledge ​

As shown in fig. p3.64, a closed, rigid tank fitted with a fine-wire electric resistor is filled with refrigerant 22, initially at 2108c, a quality of 80%, and a volume of 0.01 m3. a 12-volt battery provides a 5-amp current to the resistor for 5 minutes. if the final temperature of the refrigerant is 408c, determine the heat transfer, in kj, from the refrigerant.

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?