The answer is group 18.
Explanation:
Group 18 is known as the Noble Gases. They are the most stable elements because they have a full outer shell of valence electrons, so they have no need to bond with other elements.
Gravitational potential energy = (mass) x (gravity) x (height)
-- For the ball: PE = (2) x (9.8) x (2.2) = 43.12 joules
-- For the bullet: PE = (0.15) x (9.8) x (74) = 108.78 joules
Relative to the ground, <em>the bullet has more</em> gravitational potential energy than
the ball has, because it is 33.6 times as high off the ground as the ball is.
Where it got all of that gravitational potential energy is either somebody
carried it up a bunch of stairs from the ground to the height of 74 meters,
or else the charge of gunpowder in the shell exploded, releasing a bunch
of chemical energy, and flinging the bullet up to that great height.
Answer:
The gravitational field is really a curving of space and time. The stronger the gravity, the more spacetime curves, and the slower time itself proceeds.Time itself is slowing down and speeding up because of the relativistic way in which mass warps space and time.
Answer:
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way
Velocity = (distance covered in a direction) / (time to cover the distance)
Since the y-axis is position (distance), the speed at 3 seconds is the slope of the graph at 3 seconds, and NOT its y-value.
The slope is fairly easy to pick off, because the graph is so straight from 2 sec to 5 sec. During that time, the distance shrinks by 10 meters (from 10m to zero). So the slope of that whole piece of the graph is (-10m) / (3 sec).
That's a slope of (10/3 m/s) or 3.33 m/s .
In answer to the question, we can only give the speed at 3 sec, not the velocity, since we have no information about the direction of the motion. Consequently, I would call the speed a positive number. But it's not worth arguing about, so you should just select <em>choice-A </em>and not make a big scene.
