Jo, daniel and helen are pulling a metal ring. jo pulls with a force of 100n in one direction and daniel with a force of 140n in the opposite direction. if the ring does not move, what force does helen exert if she pulls in the same direction as jo? can someone me plz

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.

Ineed the answer to question 9 and 10

A150 liter sample of dry air in a cylinder exerts a pressure of 3.00 atmospheres at a temperature of 25°c without change the temperature a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.00 atmospheres the volume of the gas