Well we can't see the picture that the teacher has, and we have to figure out what's in the picture from some clues in the answer choices. The picture seems to show an atom with 3 protons and 3 neutrons in the nucleus, and 3 electrons whizzing around the nucleus.
If that's what's in the picture, then Mike is correct (first choice), because the atomic number shows the number of protons in all atoms. There are 3 protons and the atomic number of lithium is 3.
Second choice . . . False, because electrons are not involved in the atomic mass.
Third and fourth choices . . . both false; sadly, Joan is woefully unclear on the concepts.
Time constant of a RC circuit is
Resistance x Capacitance = 120 x [330 x 10^(-6)] = 0.0396 s
Answer:
10m
Explanation:
The object distance and image distance is the same from the mirror. so the image is 5m behind the mirror.
5+5=10
Answer: Vector quantity is a measurement that has both magnitude and direction.
Explanation:
Vector quantity is a measurement that has both magnitude and direction. Examples are force, acceleration, displacement and velocity.
3. Football: The first law takes place before the snap. When the quarterback is still calling out his play, everyone including the ball, are still. The ball remains motionless until it is acted upon by the center. The center flings the ball back to the quarterback causing it to go into motion, then remains motionless until the quarterback throws the ball to a wide receiver for a touchdown. When the defensive lines meet, the heavier players such as New England's Vince Wilfork, require much more force applied to them to move them out of the way than it would to hit Julian Edelman which explains the second law. This can also explain the third law as well. When one defensive line pushes against another, they both apply force to each other and if they are the same strength, the reaction for one lineman is the others opposite re-action