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irakobra [83]
3 years ago
11

You can use any coordinate system you like in order to solve a projectile motion problem. To demonstrate the truth of this state

ment, consider a ball thrown off the top of a building with a velocity vvec at an angle ? with respect to the horizontal. Let the building be 44.0 m tall, the initial horizontal velocity be 8.80 m/s, and the initial vertical velocity be 10.0 m/s. Choose your coordinates such that the positive y-axis is upward, and the positive x-axis is to the right, and the origin is at the point where the ball is released.
(a) With these choices, find the ball's maximum height above the ground, and the time it takes to reach the maximum height.
Maximum height above ground 1 m
Time to reach maximum height 2 s

(b) Repeat your calculations choosing the origin at the base of the building.
Maximum height above ground 3 m
Time to reach maximum height 4 s
Physics
1 answer:
posledela3 years ago
7 0

Answer:

a)  y₂ = 49.1 m ,    t = 1.02 s , b)   y = 49.1 m , t= 1.02 s

Explanation:

a) We will solve this problem with the missile launch kinematic equations, to find the maximum height, at this point the vertical speed is zero

            v_{y}² = v_{oy}² - 2 g (y –yo)

The origin of the coordinate system is on the floor and the ball is thrown from a height

           y-yo = v_{oy}² /2 g
            y- 0 = 10.0²/2 9.8
            y - 0 = 5.10 m
            
The height from the ground is the height that rises from the reference system plus the depth of the ground from the reference system
             y₂ = 5.1 + 44
             y₂ = 49.1 m
Let's use the other equation to find the time
              [tex]v_{y} = v_{oy} - g t

              t = v_{oy} / g

              t = 10 / 9.8

              t = 1.02 s

b) the maximum height

            y- 44.0 = v_{y}² / 2 g

            y - 44.0 = 5.1

            y = 5.1 +44.0

            y = 49.1 m

The time is the same because it does not depend on the initial height

              t = 1.02 s

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3 years ago
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Air pressure increases as you travel higher above sea level. This is the reason that cabins in commercial airliners require pres
irakobra [83]

The answer is true about the cabins in commercial airliners that require pressurization.

<h3>Why are the cabins of commercial airplanes pressurized?</h3>

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4 0
1 year ago
Which quantities appear in the equation for the magnetic field component of an electromagnetic wave?
tankabanditka [31]

Answer:

The speed of light (c)

Explanation:

The equation that relates the magnetic field component of an electromagnetic wave the the electric field component of the wave is:

E=cB

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3 years ago
A frame hanging on a wall is held by two cables. The tension in each cable is 30 N, and the cables make an angle of 45° with the
Vesna [10]

Answer:

(D) 42.4N

Explanation:

Since the frame is at rest, the net force acting on it must be 0. There are three forces acting on it: the gravity and the opposing forces of the two cables.

Since the gravity is a vertical force, we are only interested in the vertical components of the remaining forces. The net force equation is

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