The gravitational force.
In fact, the motion of the projectile is composed by two independent motions:
- on the horizontal direction, it is a uniform motion (with constant speed)
- on the vertical direction, it is a uniformly accelerated motion, where the vertical acceleration g is given by the gravity exerted by the Earth on the projectile.
For this reason, the composition of the two motions results in a parabolic trajectory.
Answer:
His results gave the first evidence that atoms were made up of smaller particles.
A) We know that:
Pressure = Force / Area
And for a spring,
F = kx, where k is the spring constant and x is the change in length.
P = kx/A; P = 101325 Pa
101325 = 3900x / (0.02²π)
x = 0.033 m or 3.3 cm
b) Work = 1/2 kx²
= 1/2 * 3900 * (0.033)²
= 2.12 Joules
I think unbalanced forces is one of the reasons
