How do you know how many valence electrons an atom has?

A weight lifter lifts a 200N barbel above his head from the floor to the height of 2M. He holds the barbel for 5 seconds how much work does he do during the 5s interval of time

Give three example of friction

Question: How does the total amount of energy present before an energy transformation compare to the total amount of energy present afterward? A: The energy before is equal to the energy afterward. B: The mass before is equal to the mass afterward.

A steel railroad track has a length of 40 m when the temperature is - 5 ◦C. What is the increase in the length of the rail on a hot day when the temperature is 35 ◦C? The linear expansion coefficient of steel is 11 * 10-6 (◦C) - 1.

A rock at rest falls off a tall cliff. what is the rock's velocity as the rock hits the ground 3.5s later

Smaller bits of rock that pass through the atmosphere and slam into Earth's surface are called a. asteroids. b. meteors. c. meteorites. d. meteoroids.

What is the conversion from 1.2 mm to m

Which sentence contains italicized words that are used as an infinitive phrase? A. Kelly went to the grocery store. B. Tom went there for some flour. C. Mark wanted to go, but not today. D. Jane parked her car behind a truck.

The difference in electric potential between a thunder cloud and the ground is 1.53 108 V. Electrons move from the ground which is at a lower potential to the cloud which is at a higher potential.

A vitamin called folic acid is very important for neural tube development, which is the development of the baby's