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ale4655 [162]
3 years ago
6

Two projectiles A and B are fired simultaneously from a level, horizontal surface. The projectiles are initially 62.2 m apart. P

rojectile A is
fired with a speed of 19.5 m/s at a launch angle 30° of while projectile B is fired with a speed of 19.5 m/s at a launch angle of 60°. How long
it takes one projectile to be directly above the other?​
Physics
1 answer:
Svetach [21]3 years ago
6 0

Let the point where A is launched act as the origin, so that the horizontal positions at time <em>t</em> of the respective projectiles are

• A : <em>x</em> = (19.5 m/s) cos(30°) <em>t</em>

• B : <em>x</em> = 62.2 m + (19.5 m/s) cos(60°) <em>t</em>

These positions are the same at the moment one projectile is directly above the other, which happens for time <em>t</em> such that

(19.5 m/s) cos(30°) <em>t</em> = 62.2 m + (19.5 m/s) cos(60°) <em>t</em>

Solve for <em>t</em> :

(19.5 m/s) (cos(30°) - cos(60°)) <em>t</em> = 62.2 m

<em>t</em> = (62.2 m) / ((19.5 m/s) (cos(30°) - cos(60°))

<em>t</em> ≈ 8.71 s

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Find the pressure necessary to change a volume of steel by
kramer

Answer:

160×10⁶ bar

Explanation:

Bulk modulus is defined as:

K = -V ΔP / ΔV

where V is the initial volume,

ΔP is the change in pressure,

and ΔV is the change in volume.

Given:

K = 160×10⁹ Pa

ΔV = -0.01V

160×10⁹ Pa = -V ΔP / (-0.01V)

160×10⁹ Pa = ΔP / 0.01

ΔP = 160×10¹¹ Pa

ΔP = 160×10⁶ bar

3 0
3 years ago
which observation about the Mid-Atlantic Ridge region provides the best evidence of the seafloor has been spreading over for mil
Kitty [74]

Magnetic stripes on the sea floor

Explanation:

The observation of magnetic stripes patterns at the region of the Mid-Atlantic Ridge galvanized the evidence that sea floor spreading has been on for several millions of years.

  • Geomagnetic field of the earth is similar to that of bar magnet having the north and south pole.
  • It originates from the movement of iron-nickel within the outer core.
  • This geomagnetic field causes the magnetization of magnetic minerals in rock.
  • When freshly formed magma is brought to the surface at the mid oceanic ridge area, the prevailing magnetic field causes the magnetic minerals in the magma to cool in such a way that they align their domains to that of the field.
  • The magnetic field of the earth can reverse and take different geometry. Sometimes, its intensity is very strong and at other times it is weak.
  • The magnetic minerals in melts bear these records.
  • As new materials are brought up, they get magnetized.

Learn more:

Sea floor spreading brainly.com/question/9912731

#learnwithBrainly

8 0
3 years ago
It is known that the kinetics of recrystallization for some alloy obeys the Avrami equation, andthat the value of n in the expon
trapecia [35]

Answer:8.76\times 10^{-3} min^{-1}

Explanation:

Given

n=5

0.3 fraction recrystallize after 100 min

According to Avrami equation

y=1-e^{-kt^n}

where y=fraction Transformed

k=constant

t=time

0.3=1-e^{-k(100)^5}

e^{-k(100)^5} =0.7

Taking log both sides

-k\cdot (10^{10}=\ln 0.7

k=3.566\times 10^{-11}

At this Point we want to compute t_{0.5}\ i.e.\ y=0.5

0.5=1-e^{-kt^n}

0.5=e^{-kt^n}

0.5=e^{-3.566\times 10^{-11}\cdot (t)^5}

taking log both sides

\ln 0.5=-3.566\times 10^{-11}\cdot (t)^5

t^5=1.943\times 10^{10}

t=114.2 min

Rate of Re crystallization at this temperature

t^{-1}=8.76\times 10^{-3} min^{-1}

3 0
3 years ago
Which of the following materials is necessary to stop an alpha particle? a. three feet of concrete c. single sheet of aluminum f
Nat2105 [25]
A single sheet of paper can stop an alpha particle
8 0
4 years ago
Read 2 more answers
If a person weighs 717 N on earth and 5320 N on the surface of a nearby planet, what is the acceleration due to gravity on that
Feliz [49]

<u>Answer:</u>

The acceleration due to gravity on that planet = 72.76 m/s^2

<u>Explanation:</u>

  Weight of person in earth = 717 N

  We know that weight = mg

   Acceleration due to gravity of earth = 9.8m/s^2

   So mass of person = 717/9.8 = 73.16 kg

   Mass of body is constant everywhere, so mass of person on the surface of a nearby planet = 73.16 kg

   Weight on the surface of a nearby planet = 5320 N = mg', where g' is the acceleration due to gravity value of the nearby planet.

     So   5320 = 73.16*g'

                   g' = 72.76 m/s^2

   The acceleration due to gravity on that planet = 72.76 m/s^2

8 0
4 years ago
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