Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. Potassium (K) : 1s22s22p63s23p64s1 core electrons valence electrons

A light beam is traveling through an unknown substance. When it exits that substance and enters into air, the angle of reflection is 32.0° and the angle of refraction is 42.0°. What is the index of refraction of the substance?

Describe why you weigh less on moon than on earth. Give examples

You have a cup of water that is at equilibrium with the surroundings. that means that equal amounts of water are evaporating and condenses at the same rate. if heat is added to the system what would be the effect?

A 1200 kg car is brought from 25 m/s to 10m/s over a time period of 5 seconds. Determine the force experienced by the car

What can be used to describe the quantitative data

Two friends, barbara and neil, are out rollerblading. with respect to the ground, barbara is skating due south at a speed of 5.9 m/s. neil is in front of her. with respect to the ground, neil is skating due west at a speed of 1.4 m/s.

What process is used when the sun transfers light to plants A. conduction B. radiation C. convection D. all of these

Which wave characteristic has the unit hertz

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.