When water vapor is cooled it three forms into water droplets why does this represent a conservation in mass

A positively charged particle initially at rest on the ground accelerates upward to 140 m/s in 2.10 s. The particle has a charge-to-mass ratio of 0.100 C/kg and the electric field in this region is constant and uniform.

An atom of sodium has a larger mass than an atom of neon. How is this possible when neon has so many more valence electrons? What particles make up most of the mass of an atom? What takes up most of the volume of an atom?

The weight of spaceman Speff at the surface of planet X, solely due to its gravitational pull, is 389 N. If he moves to a distance of 1.86 * 104 km above the planet's surface, his weight changes to 24.31 N.

What percent of earth's density does Jupiter have?

An electromagnetic wave in a vacuum has a wavelength of 0.032 m. What is its frequency?

A constant force is exerted for a short distance on a block of mass that is initially at rest on a horizontal frictionless plane. This force gives the block a certain final speed v.

A football quarterback is moving straight backward at a speed of 3.00 m/s when he throws a pass to a player 20.0 m straight downfield. (a) if the ball is thrown at an angle of 25.

Simone is walking her dog on a leash. The dog is pulling with force of 34 N to the right and simone is pulling backward with a force of 16 N

An object moves with velocity v (t) = t^2-8t+7 a) write a polynomial expression for the position of the particle at any time t greater or equal to zero.

Is a lack of thorns a mutation? (on a plant)