The efficiency of any machine is given by:
efficiency = output obtained / input given
Substituting the values,
Efficiency = 105 / 150
Efficiency = 0.7
Converting this to a percentage, the efficiency of the hammer is 70%.
This is a fairly high efficiency, and this is due to the fact that the hammer is a simpler machine. The more complex a machine is, the greater are the losses in it due to friction, meaning there is a lower efficiency.
Alpha particle is equivalent to B. Helium atom (2 protons, 2 neutrons)
Answer: A
Explanation: Mass and volume is the amount, amount doesn’t make the phase of a matter change.
B. 0.72 mol NaCl
http://www.convertunits.com/from/grams+NaCl/to/moles
I uploaded the answer to a file hosting. Here's link:
tinyurl.com/wtjfavyw
