When dropped from the same height, a hammer and feather fall at the same rate of acceleration in the absence of air friction and reach the ground at the same time. Why?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.