In which situation is no work considered to be done by a force?
A. when the angle between the force and displacement is 180°
B. when the angle between the force and displacement is 90°
C. when the angle between the force and displacement is 45°
D.
when the angle between the force and displacement is oº

What type of reaction is zn + cucl2 → cu + zncl2?

What is the value of keq for the reaction expressed in scientific notation

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons