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3 years ago

Explain why free fall acceleration near earths surface is constant

Physics

1 answer:

Naya [18.7K]3 years ago

4 0

Because gravity is constant
the only force acting in free-fall is gravity which points downward at 9.8 m/s

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an underground cannon launches a cannonball from ground level at a 35-degree angle. the cannonball is shot with an initial veloc

Allushta [10]

Answer:

$\displaystyle x_{max}=21.57\ m$

$\displaystyle y_{max}=3.78\ m$

Explanation:

Motion in Two-Dimensions

When an object is launched with a certain angle $\theta$ above ground level with an initial velocity $\vec v_o$ , it describes a curve called a parabola, defined by the force of gravity which will eventually make the object return to the ground. There are two overlapping motions, the horizontal motion, at a constant speed, and the vertical motion, at changing speed because the acceleration of gravity modifies it. The velocity $\vec v_o$ is split into two components x,y

$\displaystyle v_{ox}=|vo|\ Cos\theta$

$\displaystyle v_{oy}=|vo|\ Sin\theta$

The position of the object is also split into its components, assuming the object was launched from ground level

$\displaystyle x=v_{ox}.t$

$\displaystyle y=v_{oy}.t-\frac{g.t^2}{2}$

The maximum horizontal distance the object reaches (called range) is

$\displaystyle x_{max}=\frac{2v_{ox}\ v_{oy}}{g}$

The maximum height is given by

$\displaystyle y_{max}=\frac{v_{oy}^2}{2g}$

The question doesn't ask for anything in particular, but to guide you in the solution of your own problem, we'll compute $X_{max}$ and $Y_{max}$ for you. The data is

$\displaystyle |vo|=15\ m/s\ ,\ \theta =35^o$

Let's compute the range

$\displaystyle x_{max}=\frac{(2)(15)\ cos35^o\ (15)\ sen35^o}{9.8}$

$\displaystyle x_{max}=\frac{211.43}{9.8}=21.57\ m$

Now for the maximum height

$\displaystyle y_{max}=\frac{(15\ . \ Sin35^o)^2}{2(9.8)}$

$\displaystyle y_{max}=\frac{74.0227}{19.6}$

$\displaystyle y_{max}=3.78\ m$

6 0

3 years ago

What is MyPyramid?

Nookie1986 [14]

Answer:

Explanation:

lol Hope's this helps lovely

5 0

3 years ago

A boy is pulling a wagon with a force of 70.0 N directed at an angle of 30 degrees above the horizontal. What are the x and y co

bogdanovich [222]

Answer:

x component is 60.60 N and y component is 35 N ⇒ answer A

Explanation:

A boy is pulling a wagon with a force of 70.0 N directed at an angle

of 30 degrees above the horizontal then,

$F_{x}$ is the horizontal component of the force in the direction

of positive part of x-axis

$F_{y}$ is the vertical component of the force force in the direction

of positive part of y-axis

The x component of the force $F_{x}$ is the force multiplied by

cos(30)°

The y component of the force $F_{y}$ is the force multiplied by

sin(30)°

→ The x component $F_{x}$ = F cos(30)

→ The x component $F_{x}$ = 70 cos(30) = 60.60 N

→ The y component $F_{y}$ = F sin(30)

→ The y component $F_{y}$ = 70 sin(3) = 35 N

x component is 60.60 N and y component is 35 N

7 0

4 years ago

The chemical and physical actions of groundwater form

miv72 [106K]

The chemical and physical actions of groundwater form Karst topography. It is any region where the terrain has been dissolved by the physical and chemical weathering of the bedrock.
There is no reason why glaciers, volcanoes, and mountains should be formed as a result of these actions.

5 0

4 years ago

Read 2 more answers

Which best describes how magnesium and oxygen bond?

Lostsunrise [7]

Answer:

They form an ionic bond by exchanging two electrons.

Explanation:

7 0

3 years ago