When you see an image of an object in a flat mirror,

Consider a silicon wafer used in technology industry, ordinary glass, and liquid water. Which is true?

Two containers of hydrogen of hydrogen are in thermal equilibrium.  The pressure in Container1 is higher than pressure in Container2.  Which is true?

A charge neutral atom has 3 protons.  Which can we infer?

A 3kg mass is supported in equilibrium by a vertical spring of spring constant 60 N/m. What is the displacement of the spring from the weight of the mass at equilibrium?

Protozoa are classified into four groups based on ______.

Which shell does the outermost electron of Li occupy? 

Convert 0.000741 to scientific notation.

Two objects of unequal masses collide.  The forces each exert on the other:

A block slides up a ramp, with gravity and sliding friction the only forces acting. The ramp is 6 m long parallel to it’s surface, and the top is 3 m from the ground measured vertically (because of the incline angle).  Which distance would you use to calculate the work done by friction?