1. A 14 N force is applied for 0.33 seconds. Calculate the impulse. 2. A 48 kg object is moving 12 m/s down. It hits the ground and bounces up moving 10 m/s.
A. Which velocity is negative?
B. Calculate the initial momentum of the object.
48kg
10m/s
12m/s
48kg
C. Calculate the final momentum of the object.
D. Remembering that "change of" is always final – initial,
what is the change of momentum of the object?

1. The impulse of the force is 4.62 kg·m/s

2. A. The negative velocity is the return 10 m/s velocity on the way upwards

B. The initial momentum of the object is 576 kg·m/s

C. The final momentum of the object is -480 kg·m/s

D. The change of momentum of the object is -1,056 kg·m/s

Explanation:

1. The magnitude of the applied force, F = 14 N

The duration of the applied force, Δt = 0.33 seconds

The impulse of the force, I = F × Δt

By substitution of the values, we have;

The impulse of the force, I = 14 N × 0.33 s = 4.62 N·s = 4.62 kg·m/s

2. The mass of the object, m = 48 kg

The initial velocity of the object, v₁ = 12 m/s

The final velocity of the object, v₂ = -10 m/s

A. The initial velocity = 12 m/s (downwards)

The negative velocity is the velocity that is in the opposite direction to the initial downward velocity, therefore, the upwards 10 m/s velocity is the negative velocity

B. The initial momentum of the object, = m₁·v₁

By substituting the values, we have;

= 48 kg × 12 m/s = 576 kg·m/s

C. The final momentum of the object, = m₂·v₂

By substituting the values, we have;

= 48 kg × (-10 m/s) = -480 kg·m/s

D. The change of momentum of the object, ΔP = -

∴ ΔP = -480 kg·m/s - 576 kg·m/s = -1,056 kg·m/s

The change of momentum of the object, ΔP = -1,056 kg·m/s.

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like . (i crazy)

most famous scientist who contributed to this physics are:

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption