The atomic number of krypton (kr) is 36, and its mass number is 84. how many neutrons does it have? 18 36 48 72

A 150 kg mass is on a cliff 50 m high. What is its potential energy? 9 How much work is done moving a 2.5 kg book to a shelf 3.0 m high? 10. A 150 pound man runs up a stairway 25 feet above ground level in 10 s. How much work did the man do?

A plane flies along a straight line path after taking off, and it ends up 210 km farther east and 90.0 km farther north, relative to where it started. What is the plane's displacement? A. 300 km B. 141 km C. 230 km D. 120 km

A train moves forward at a constant speed. What is true about the forces acting on the train? SC. C. 2.3.6 A. The forward forces are equal to the forces acting in the backward direction. B.

Reducing speed increases a drivers total stopping distance

How many valence electrons, electrons, protons, and neutrons does silicon have?

Three light bulbs are wired in series. What happens if one of these light bulbs burn out

How do you distinguish a pure substance from a mixture?

Does the size of the particles change as the substance changes state?

What is the Z number of an atom with 9 protons, 8 neutrons, and 7 electrons? 7 8 9 16 17

What is the most dense crust