Answer:
III. A baseball is traveling at 38 m/s when it hits a wall and bounces away from the wall at -38 m/s
Explanation:
The change in momentum of the baseball is a function of its change in velocity. And can be shown mathematically as;
∆p = m (∆v)
Where ∆p change in momentum
m mass of baseball
∆v change in velocity
Which implies that the higher the change in velocity of the baseball the higher the change in momentum.
I) ∆v = 38 - 0 = 38m/s
II) ∆v = 0 - 38 = -38m/s
III) ∆v = -38-38 = -76m/s
Therefore the third event have the highest change in velocity and thus have the highest change in momentum.
Answer:
B. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same.
Explanation:
Given that Planets A and B have the same size, mass.
Let the masses of the planets A and B are
and
respectively.
As masses are equal, so
.
Similarly, let the radii of the planets A and B are
and
respectively.
As radii are equal, so
.
Let my mass is m.
As the weight of any object on the planet is equal to the gravitational force exerted by the planet on the object.
So, my weight on planet A, 
my weight of planet B, 
By using equations (i) and (ii),
.
So, the weight on both planets is the same because their masses and the distance to their centers of gravity are the same.
Hence, option (B) is correct.
Answer: Pituitary Gland
Explanation: The pituitary gland produces hormones that control other glands and body functions, therefore, it is sometimes called the master endocrine gland.
Answer:
Gravity is a constant quantity
Explanation: