Talking about the newtons law: which interaction does not take place due to field forces?
a) interaction between protons and electrons
b) interaction between a ball in flight and the earth below
c) interaction between mars and the sun
d) interaction between a pen and paper while you write

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

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?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?