If element X has 78 protons, how many electrons does it have?

Symptoms of delayed cell-mediated reactions are due to

The angle a vector makes with the x-axis of a coordinate system must be what size in order to make one or more of its components negative? less than 30 degrees between 30 and 60 degrees between 61 and 90 degrees greater than 90 degrees

In the diagram, the solid eventually becomes a gas. what will happen to bring the substance from a solid to a gas?

If Superman wants to slow down a fast car with speed 20 m/s and mass 1000 kg, how much force in N does he need to apply if he wants to get it down to zero within 3.2 seconds?

Which phase of matter consists of particles that vibrate only?

What is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure?

What 2 events increase power output

Which statement is true for particles of the medium of an earthquake P-wave?

If 128 g of material is in the shape of a brick 2 cm wide, 4 cm high, and 8 cm long, what is the density of the material?

A source emits monochromatic light of wavelength 495 nm in air. when the light passes through a liquid, its wavelength reduces to 434 nm what is the liquid's index of refraction? a. 1.14 b. 1.49 c. 2.03 d. 1.26 e. 1.33