How does the number of valence electrons affect the reactivity?

A tennis ball is dropped from 1.13 m above the ground. It rebounds to a height of 0.876 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s2. (Let down be negative.) Answer in units of m/s.

How many miles per hour does it take to break the sound barrier?

A system releases 20 J of heat into its surroundings while the surroundings perform 80 J of work on the system. What is the change of energy of the system? (Use AU=Q-W]

If the breakers at a beach are separated by 5 m and hit shore with a frequency of 0.3 Hz, at what speed are they traveling?

The distance a vehicle travels can be calculated as follows: distance=speed*time For example, if a train travels 40 miles per hour for three hours, the distance traveled is 120 miles.

What two equations can be used to determine the speed of a wave

Which force has an infinite range and is always attractive?

A ramp with a mechanical advantage of 8 lifts objects to a height of 1.5 meters how long is the ramp

Sodium, atomic number 11, forms an ionic bond with an atom of an unknown element. What is one possible choice for the ther element in the compound?

A ship leaves the island of Guam and sails a distance 255 km at an angle 49.0 o north of west. Part A: In which direction must it now head so that its resultant displacement will be 125 km directly east of Guam?