How many outer-ring electrons does a calcium atom have?

The men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, how many seconds would it take to swim0.650miles (1 mi = 1609 m) ?

A light wave is shone on a glass block. At the boundary between air and glass, which wave phenomena can been demonstrated? A) You can demonstrate reflection off the glass. B) You can demonstrate refraction as it enters the glass.

One of the following statements is incorrect, (a) The car traveled around the track at a constant velocity. (b) The car traveled around the track at a constant speed. Which statement is incorrect and why?

Can instantaneous velocity ever be negative?

During which stage of parental development are nearly all basic organs formed?

A machine with a mechanical advantage of 10 is used to produce an output force of 250 newtons. What input force is applied to this machine

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?