The force between two protons separated by a distance of one nanometer is a) 9.22 x 10^-10 N
b) 2.99 x 10^-10 N
c) 4.22 x 10^-15 N
d) 9.22 x 10^-20 N

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

The average density of the planet uranus is 1.27 103 kg/m3. the ratio of the mass of neptune to that of uranus is 1.19. the ratio of the radius of neptune to that of uranus is 0.969. find the average density of neptune.