a 1400 kg car experiences a total ret arding frictional force of 700 N as it climbs a 10 hill at a constant 80 km/h. How much power must the car be able to generate through its wheels to do this?

Could someone me find the answer to this problem.

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?