Two blocks with masses m and 3m are attached to the ends of a string with a negligible mass that passes over a pulley. The pulley has a negligible mass and friction and is attached to the ceiling. The blocks are simultaneously released from rest.
Derive an equation for the speed v of the block of mass 3m after it falls a distance d in terms of m, d, and physical constants?

What is hidden during a lunar eclipse? isn't the moon hidden?

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

In one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.