Physics, 19.03.2020 01:29 summer996

Two stones are launched from the top of a tall building. One stone is thrown in a direction 15.0 ∘∘ above the horizontal with a speed of 20.0 m/sm/s ; the other is thrown in a direction 15.0 ∘∘ below the horizontal with the same speed.

Which stone spends more time in the air? (Neglet air resistance)

a. The stone thrown upward spends more time in the air.

b. The stone thrown downward spends more time in the air.

c. Both stones spend the same amount of time in the air.

Answers: 3

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Answers

Answer from: johnlumpkin5183

Explanation:

Given

First stone is thrown $15^{\circ}$ above the horizontal with some speed let say u

Second stone is thrown at $15^{\circ}$ below the horizontal with speed u

For a height h of building

For first stone (motion in vertical direction)

using

v^2-u^2=2ah

where v=final velocity

u=initial velocity

a=acceleration

h=displacement

$h=u\sin 15(t_1)-\frac{1}{2}gt_1^2---1$

For second stone

$h=(-u\sin 15)(t_2)-\frac{1}{2}gt_2^2----2$

Equating 1 and 2

$u\sin 15(t_1+t_2)-\frac{1}{2}g(t_1-t_2)(t_1+t_2)=0$

$(t_1+t_2)[u\sin 15-4.9(t_1-t_2)]=0$

as t_1+t_2 cannot be zero

so $t_1-t_2=1.05\ s$

t_1=t_2+1.056

therefore time taken by first stone(thrown upward) will be more.

Answer from: Quest

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explanation:

my daughter rae

Answer from: Quest

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 $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

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:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

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

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