The mass of a block is 87.5 g and its volume is 25 cm. Its density upto correct significant figures is (a) 34488 g/cc
(b) 35 g/cc
(c) 3148 g/cc
(d) 34 g/cc

The mass of a muon is 207 times the electron mass; the average lifetime of muons at rest is 2.21 μs. in a certain experiment, muons moving through a laboratory are measured to have an average lifetime of 7.04 μs. for the moving muons, what are (a) β (b) k, and (c) p? the rest energy of the electron is 0.511 mev.

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

Directions: count the number of atoms. ar co2 na3po4 so3 nac2h3o2