Number of valence electrons for calcium?

How much time (in seconds does it take light to travel 1.20 billion km?

If two objects are moving at the same speed, and Object 1 has four times as much mass as Object 2, how much momentum does Object 1 have compared to Object 2? 1. Twice as much 2. One-fourth as much 3. The same amount 4. Four times as much

A copper rod at 25°C is 2.5 m long. How long would it take a sound to move through the rod from one end to another? how would I do this?

Does the inertia of an object change as the object's velocity changes explain

Which is the average kinetic energy of particles in an object? work temperature

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. if the force you apply has a magnitude of 86 n, what is the cart's acceleration? assume negligible friction.

Two objects are made of the same material, but they have different masses and temperatures. If the objects are brought into thermal contact, which one will have the greater temperature change

A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

A car slows down from 24 m/s to rest in a distance of 90 m. what was its acceleration, assumed constant? incorrect: your answer is incorrect. m/s2