The equation shows neutralization of an acid and a base to produce a salt and water.

2HCl + Na2O → xNaCl + H2O

Which value of x will balance the equation?

What would a Munsell scale be used for A) characterizing soil color B) identifying mineral composition in soil samples C) measuring soil density D) identifying soil particle size

A car has a momentum of 20,000 kg • m/s. What would the car's momentum be if its velocity doubles?

The timbre of an instrument or voice is determined by

A ladybug starts at the center of a 16.0 in.-diameter turntable and crawls in a straight radial line to the edge. While this is happening, the turntable turns through a 60.0 ∘ angle.

What factors does the speed of atoms depend on?

T=2π√ (l/g) is dimensionally correct

A penny falls from a windowsill which is 25.0 m above the sidewalk. How much time does a passerby on the sidewalk below have to move out of the way before the penny hits the ground?

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)