An atom of element A has 39 protons. What would the element's atomic number be?

What does it mean to try and balance energy intake and energy expenditure

According to Galileo's pendulum theory, which factor determines the time taken to swing through one complete cycle?

What is located in the exosphere?

How elevation effect on climate

Which of the following describes the formation of air convection currents? A. Molecules in cooler air move faster and farther apart than those in warmer air. B. Cooler air moves in over the warm air and pushes it down. C.

What did Issac Newton think he could describe?

Which two states share the property of changing shape in different containers? A. Liquids and gases B. Gases and solids C. Solids and liquids D. Solids and plasmas

Which type of soil is the most permeable? A. sand B. silt C. loam D. clay

If your mass is 20kg, and you stand on the scale (witch is your force), and the acceleration due to gravity is10m/s^2, what does the scale says your weight is?

Which statement best describes the movement of particles when a wave travels through a medium? The particles are