If element X has 78 protons, how many electrons does it have?

Two horses leave the starting gate at the beginning of a 2000 m long race. The brown horse has an acceleration of 2.2 m/s2 and a top constant speed of 18 m/s. The black horse has an acceleration of 1.7 m/s2 and a top constant speed of 20 m/s.

A rock is dropped from a sea cliff, and the sound of it striking the ocean in heard 3.0. s later. If the speed of sound is 340m/s, how high is the cliff?

List three examples of a skillets (cooking utensil) basic use.

When should the power switch be in the off position? Check all that apply

How many electrons does an aluminum atom have

Part of the solar radiation entering the atmosphere about ___ actually reaches the earth's surface

A 36.5 kg box initially at rest is pushed 4.30 m along a rough, horizontal floor with a constant applied horizontal force of 150 N. If the coefficient of friction between box and floor is 0.300, find the following.

3 In a television tube, an electron starting from rest experiences a force of 4.0 * 10-15 N over a distance of 50 cm. The final speed of the electron is (do not worry about relativistic effects) :

Detail some of the anthropogenic changes to Earth's climate and their potential impact on life.

I have completed 40 minutes of exercise today and will enter a short description in the course Activity Log. True or False