Physics, 29.08.2019 06:30 jamarlittles9132

Arugby player passes the ball 7.25 m across the field, where it is caught at the same height as it left his hand. at what angle was the ball thrown if its initial speed was 12.0 m/s, assuming that the smaller of the two possible angles was used

Answers: 1

Show answers

Answers

Let x = angle at which the ball was thrown, relative to the horizontal.

The vertical component of velocity is
Vy = (12 m/s)sin(x) = 12sin(x) m/s

At maximum height, the vertical velocity is zero. The time to attain maximum height is given by
12sin(x) - gt = 0
t = [12sin(x)]/9.8 = 1.2245sin(x) s

The horizontal component of velocity is 12cos(x) m/s.
The time taken to travel 7.25 m is 2t. Because distance = velocity*time, therefore
12cos(x)*(2*1.2245sin(x)) = 7.25
14.694*(2sin(x)cos(x)) = 7.25

Note that 2sin(x)cos(x) = sin(2x). Therefore
sin(2x) = 7.25/14.694 = 0.4934
2x = arcsin(0.4934) = 29.56°
x = 14.8° (nearest tenth)

14.8° (approx. 15°)

Answer from: Quest

The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator -strong, steady winds

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

Other questions on the subject: Physics

Physics, 22.06.2019 02:30, jendun123ovrxij

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Answers: 1

continue

Physics, 22.06.2019 11:00, flores1717

Positrons are spontaneously emitted from the nuclei of

Answers: 1

continue

Physics, 22.06.2019 12:50, WritingStar1313

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.

Answers: 1

continue

Physics, 22.06.2019 13:30, Bra1nPowers

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.

Answers: 3

continue

You know the right answer?

Arugby player passes the ball 7.25 m across the field, where it is caught at the same height as it l...