If element X has 39 protons, how many electrons does it have?

Which layer of the atom sphere contacts the surface of earth

Which of the following is a possible explanation for a set of observations or answer to a scientific question? A. prediction B. hypothesis C. variable D. law ?

Which layer of earth is soild iron and nickel A. crust B. inner core C. outer core D. mantle

Which statement correctly describes the relationship between air temperature and air pressure?

Can an object with a constant acceleration have a changing velocity Explain

What is the relationship between gravity and mass? What is the relationship between gravity and distance?

A person performs 300 j of work over the course of 60 seconds how much power they did required

If you have a 90 V power source with a 30-Ω and 60-Ω resistor in series, what is the voltage drop over the 60-Ω resistor? 30 V 2 V 60 V 90 V

How is thermal energy transferred during convection?

What is the purpose of a free body diagram? A. to show the velocity of an object B. to show the acceleration of an object C. to show the forces acting on an object D. to show the direction of motion vectors of an object