Answer:
0.25m²
Explanation:
We know that the summation of forces in the vertical direction is zero
So
PA-mg=0
A=mg/p
So
Substituting
A= 75* 9.8/3*10^-3
=0.25m² which is the total shoe area
Answer:
The ball thrown downward
Explanation:
When the ball is thrown vertically, the acceleration of it is the gravity acceleration independent if it is thrown downward or upward. However, the acceleration is a vector, so, when the ball is thrown upward, the movement is against the gravity, so the acceleration is negative, and so, the velocity decreases during time; and when the ball is thrown downward, the movement goes to the gravity, so the acceleration is positive, so the velocity increase after time passes.
The answer is energy.
Waves in the ocean are energy travelling along water.
Waves do not transport mass, they transport energy, this is the ability to perform work or exert force and distant points.
Although water seems to be travelling along with the wave, the molecules of water only move up and down; they do not travel along with the wave.
(C) 200 N
Explanation:
The acceleration due to gravity on earth 
is given by
where 
= universal gravitational constant
= mass of the earth
= radius of the earth
Planet Krypton has twice the mass of earth and 3 times the radius so its acceleration due to gravity 
is
or
If we multiply both sides by Superman's mass, we get his weights on both planets:
Percentage error:
1.55 – 1.53 ÷ 1.53
0.02 ÷ 1.53
.013 x 100
1.3 % error
I hope this is right.
