The first periodic table of elements Mendeleev created contained how many elements

A baseball with a mass of 145 g is thrown at a velocity of 42.3 m/s. Express its momentum in the appropriate SI unit

How is it possible for one electrically neutral atom to exert an electrostatic force on other electrically neutral atom?

The water table is the A. upper boundary of the zone of saturation. B. zone of aeration. C. lower boundary of the zone of saturation. D. aquifer.

ou purchase a rectangular piece of metal that has dimen - sions 5.0 * 15.0 * 30.0 mm and mass 0.0158 kg. The seller tells you that the metal is gold. To check this, you compute the average density of the piece.

A capacitor consists of two plates that each contain electric charges. How does the type and amount of charge on one plate compare with the type and amount of charge on the other plate?

Let's now apply our equations for the normal modes of open and closed pipes. On a day when the speed of sound is 345 m/s, the fundamental frequency of an open organ pipe is 690 Hz.

Suppose you are an observer standing on the Moon, looking back at Earth. If the moon is in the waxingquarter phase, what phase of the Earth would you see? A. waxing quarter B. full C. new D. waning quarter E. none; the Earth doesn't have phases

How many chromosomes will an elephant's sperm have?

Would the springs inside a bathroom scale be more compressed or less compressed if you weighed yourself in an elevator that was moving upward at constant velocity

tessa bought stock in a restaurant for $287.00 her stock is now worth $401.80 what is the percentage increase of the value of Tessa's stock?