Answer:
a) 2.5 m/s. (In the opposite direction to the direction in which she threw the boot).
b) The centre of mass is still at the starting point for both bodies.
c) It'll take Sally 12 s to reach the shore which is 30 m from her starting point.
Explanation:
Linear momentum is conserved.
(mass of boot) × (velocity of boot) + (mass of sally) × (velocity of Sally) = 0
5×30 + 60 × v = 0
v = (-150/60) = -2.5 m/s. (Minus inicates that motion is in the opposite direction to the direction in which she threw the boot).
b) At time t = 10 s,
Sally has travelled 25 m and the boot has travelled 300 m.
Taking the starting point for both bodies as the origin, and Sally's direction as the positive direction.
Centre of mass = [(60)(25) + (5)(-300)]/(60+5)
= 0 m.
The centre of mass is still at the starting point for both bodies.
c) The shore is 30 m away.
Speed = (Distance)/(time)
Time = (Distance)/(speed) = (30/2.5)
Time = 12 s
Hope this Helps!!!
Answer:
s = 6.25 10⁻²² m
Explanation:
Polarizability is the separation of electric charges in a structure, in the case of the atom it is the result of the separation of positive charges in the nucleus and the electrons in their orbits, macroscopically it is approximated by
p = q s
s = p / q
let's calculate
s = 1 10⁻⁴⁰ / 1.6 10⁻¹⁹
s = 0.625 10⁻²¹ m
s = 6.25 10⁻²² m
We see that the result is much smaller than the size of the atom, therefore this simplistic model cannot be taken to an atomic scale.
Explanation:
The principle of uniformitarianism was proposed by James Hutton, a Scottish geologist to explain geologic processes and how they relate in space.
According to the principle "the present is the key to the past and geologic process occurring today have occurred in times past. ".
- Saddled with this knowledge, geologists can understand and unravel how rocks form and how the earth has been sculpted.
- Today, in some places on earth, we see volcanic activities.
- Such a place is on the Hawaiian Islands where hot plumes are coming to the surface.
- In like manner, the lava cools and solidifies to form new volcanic basalt.
- Using this knowledge, any geologist can unravel any igneous rock.
- From the activities in Hawaii, we know that past igneous rocks must have been formed by the cooling and solidification of magma.
- This the tenet of the uniformitarian principle.
learn more:
Continental drift brainly.com/question/5002949
#learnwithBrainly
The answer is a dense substance that is hard and incompressible.
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
Hoped I helped!
