The mass of a car is 625kg. Calculate the weight of the gravitational field strength is 10 N/kg.

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?

At what time would the magnitude of the velocity reach 36.00 km/hr

How many electrons does each element require in its valence shell to become stable?