Horace Suppose a hypothetical Planet revolves about hypothetical stav along Circular or bit of radius 4x10¹⁰ m. if the peired of rotation of the planet is 25 Years. Calculate the mass of the star.​

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Diamond will scratch quartz. true or false