Is compound a subatomic particle

Electric charge is uniformly distributed inside a nonconducting sphere of radius 0.30 m. the electric field at a point p, which is 0.50 m from the center of the sphere, is 15,000 n/c and is directed radially outward. what is the maximum magnitude of the electric field due to this sphere

Which is not true about oxygen-17 and oxygen-18?

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?