Describe what would happen if you rubbed a mineral with a mohs hardness value of 7 against a mineral with a value of 5?

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?