1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
12345 [234]
3 years ago
12

Completenlo por favor

Physics
1 answer:
Ainat [17]3 years ago
3 0

La velocidad \mathbf v del objeto al tiempo t es descrito por

\mathbf v(t)=v_x(t)\,\mathbf i+v_y(t)\,\mathbf j

donde

\begin{cases}v_x(t)={v_x}_0+a_xt\\v_y(t)={v_y}_0+a_yt\end{cases}

El objeto no tiene aceleración horizontal, pues a_x=0 y v_x está determinado exactamente por su velocidad inicial en la dirección horizontal. En la dirección vertical, la gravedad es la única fuerza que actúa en el objeto, pues a_y=-9.81\,\dfrac{\mathrm m}{\mathrm s^2}. Entonces, la velocidad después de 3\,\mathrm s satisface

{v_x}_0\,\mathbf i+\left({v_y}_0+\left(-9.81\,\dfrac{\mathrm m}{\mathrm s^2}\right)(3\,\mathrm s)\right)\,\mathbf j=20\,\mathbf i-4\,\mathbf j

Inmediatamente, vemos que {v_x}_0=20\,\dfrac{\mathrm m}{\mathrm s} y podemos encontrar que {v_y}_0=25.43\,\dfrac{\mathrm m}{\mathrm s}.

Su posicíon es descrita al tiempo t por

\mathbr r(t)=r_x\,\mathbf i+r_y\,\mathbf j

con

\begin{cases}r_x={r_0}_x+{v_0}_xt+\dfrac12a_xt^2\\\\r_y={r_0}_y+{v_0}_yt+\dfrac12a_yt^2\end{cases}

Si la posición inicial del objeto es el origen, suponemos que \mathbr r(0)=\mathbf 0, y además tenemos

\mathbf r(t)=\left(20\,\dfrac{\mathrm m}{\mathrm s}\right)t\,\mathbf i+\left(\left(25.43\,\dfrac{\mathrm m}{\mathrm s}\right)t+\dfrac12\left(-9.81\,\dfrac{\mathrm m}{\mathrm s^2}\right)t^2\right)\,\mathbf j

Queremos determinar el máximo de r_y. Encontramos que {r_y}_{\mathrm{max}}\approx32.9\,\mathrm m cuando t\approx2.59\,\mathrm s.

You might be interested in
Coal burns in a furnace, producing light and heat. This reaction is
olasank [31]

The reaction is Exothermic

8 0
3 years ago
Read 2 more answers
Two protons are released from rest, with only the electrostatic force acting. Which of the following statements must be true abo
ycow [4]

Answer:

(A)

Explanation:

We know , electric potential energy between two charge particles of charges "q" and "Q" respectively is given by kqQ/r where r is the distance between them.

Since the two charged particles are moving apart, the distance between them (r) increases and thus electrical potential energy decreases.

7 0
3 years ago
Who much force is needed to accelerate a 68 kilogram-skier at a Rate of 1.2 m/sec
liberstina [14]
If F =m*a
and the question says how much force the s needed to accelerate a 68kg skier to a rate of 1.2ms^-2
Then F = 68*1.2
7 0
3 years ago
how to A golf ball of mass 0.045 kg is hit off the tee at a speed of 45 m/s. The golf club was in contact with the ball for 3.5
Alexandra [31]

Answer: a) 12857.1 m/s/s b) 578.6 N

Explanation:

Impulse = change in momentum

Ft = mV2 - mV1

V = AT, 45 / .0035 = 12857.1 m/s/s

(b) .045 x 12857.1 = 578.6 N

4 0
3 years ago
Read 2 more answers
The particles that make up protons and neutrons are called
Sphinxa [80]

Answer:

Quark

Explanation:

In the past the proton,neutron and electron were believed to be indivisible. Quarks were later discovered to be particles that make up the proton and neutron. Quarks are known as fast moving points of energy and are usually joined to one another through gluons. Neutron has two down quarks and one up quark while proton has two up quarks and one down quark.

6 0
3 years ago
Other questions:
  • What is the pH scale used for? a. Measures hydroxide ion concentration (strength of the acid or base) b. Measures hydronium ion
    11·1 answer
  • A glowing electric light bulb placed 15 cm from a concave spherical mirror produces a real image 8.9 from the mirror. the light
    7·1 answer
  • Please help<br> Quickly!!!..
    6·1 answer
  • Two wooden boxes of equal mass but different density are held beneath the surface of a large container of water. Box A has a sma
    15·1 answer
  • How do you make an electromagnet
    15·2 answers
  • Need help please !!!! Hurry
    10·2 answers
  • Deduceți expresia relației Robert Mayer pentru căldurile specifice ale gazulu ideal! va r0g urgent
    11·1 answer
  • Which equation shows the relationship of wave speed to
    15·1 answer
  • Which formula can be used to find the tangential speed of an orbiting object? v = StartFraction 2 pi r over T EndFraction v = St
    10·2 answers
  • A spring of negligible mass and force constant k = 430 N/m is hung vertically, and a 0.270 kg pan is suspended from its lower en
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!