NEED HELP FAST. If anybody is great with Geometry or Physical Science, PM me.

The mass of an electron is

A) equal to the mass of the proton and the neutron

B) not significant to the overall mass of the atom

C) higher than the mass of the proton or the neutron

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Which is not true about oxygen-17 and oxygen-18?

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer