The total number of protons plus neutrons in an atom of ⁴⁵₂₀Ca is

A.) 20

B.) 25

C.) 45

D.) 65

Compare the outermost electrons of an atom with the inner most electrons of an atom in terms of energy

How much work is required to move a 1 coulomb charge a distance of 2 meters along an equipotential line or conductor of 12.5 volts

A bus travelling at a speed of 40 kmph reaches its destination in 8 minutes and 15 seconds. How far is the destination? a. 5.43 km b. 5.44 km c. 5.50 km d. 9.06 km

You are playing catch with a friend in a moving train. When you toss the ball in the direction the train is moving, how does the speed of the ball appear to an observer standing at rest outside the train?

A turtle crawls at a constant speed, moving 4.77 m in 19.5 s. What was the turtle's velocity?

Why does an object's mass and speed cause it to have kinetic energy?

Eratosthenes used what object to determine the size of Earth? A) Pyramids in Giza, B) Tower in Babel, C) Sphinx in Alezandria, D) Well in Alexandria

A major process by which the Sun's energy is transported around the Earth system?

Charge 1 is - 30 μC, charge 2 is 5 μC, the distance between the charges is 8 cm, and they are located in a vacuum. If the third charge of 3 μC would be placed into position B, i. e.

For water vapor to turn back i to a liquid what do you do to it's temperature