How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?

Aforce of 40n applied at the end of length 4m and diameter 2.00mm process and extension of 0.24mm,calculate the stress on the wire, strain in the wire and the young modulus for the material of the wire