A ball is thrown horizontally which factor will increase the flight time of the ball

Is the following chemical equation balanced? 4Al + 3O2 2Al2O3 yes no

ycow [4]

Answer:no Explanation:

8 0

3 years ago

________ is the name for when a director decides where and when performers move and position themselves on the stage.

Maurinko [17]

Answer:

Blocking/staging

Explanation:

Blocking/staging is the name for when a director decides where and when performers move and position themselves on the stage.

Moreover, Blocking a dream sequence is merely "working on the details of an actor's movements with regard to the camera." We can also reckon of blocking as the dance routines of a dance or a ballet: all the components on the set must move in perfect sync with one another (performers, extras, automobiles, crew, machinery).

5 0

3 years ago

Which process requires the addition of energy to water?

Taya2010 [7]

Water must absorb energy in order to melt, evaporate, or get warmer.

3 0

3 years ago

A hot air balloon is flying above Grovenburg. To the left side of the balloon, the balloonist measure the angle of depression to

Savatey [412]

Find enclosed file with a drawing and the calculations of all angles and all distances.

These are the results that you will find in it:

Angle x = 90° - 22°15’

Angle y = 90° - 62°30'

Angle z = 22°15’ = 22.25°

Angle w = 62°30’ = 62.50°

tan(z) = H/a => a = H/tan(z)

tan(w) = H/b => b = H/tan(w)

a+b = 4 => H/tan(z) + H/tan(w) = 4 => H [1/tan(z) + 1/tan(x) ] = 4

H = 4 / {[1/tan(z) + 1/tan(x) ] } = 1.35 miles

a = 1.35 / tan(22.25°) = 3.30 miles

b = 4 – 3.30 = 0.7 miles

I hope it is very useful and you understand it. Let me know.

Download pdf

6 0

3 years ago

A ladder whose length L is 12 m and mass m is 45 kg rests against a wall. Its upper end is a distance h of 9.3 m above the groun

amm1812

Answer:

FN₁ = 1146.6N : Force exerted on the ladder by the floor , vertical and upward

FN₂ = 407.5 N : Force exerted on the ladder by the wall , horizontal and opposite to friction force between the floor and the ladder

Explanation:

The equilibrium equation are:

∑Fx=0

∑Fy=0

∑M = 0

M = F*d

Where:

∑M : Algebraic sum of moments

M : moment ( N*m)

F : Force ( N)

d :Perpendicular distance of the force to the point ( meters )

Data

m =45 kg : mass of the ladder

M =72 kg : mass of the fire fighter

g = 9.8 m/s²: acceleration due to gravity

L = 12 m : ladder length

h = 9.3 m: ladder height

L/3 = 12/3 = 4m Location of the center of mass of the ladder of the way up

L/2 = 12/2 = 6m Location of the center of mass of the fire fighter

µ = 0 : coefficient of friction between the ladder and the wall

θ : angle that makes the ladder with the floor

sinθ = h/L = 9.3 m/12 m

θ =sin⁻¹( 9.3 / 12)

θ = 50.8°

Forces acting on the ladder

W₁ =m*g = 45 kg* 9.8 m/s² = 441 N: Weight of the ladder (vertical downward)

W₂ =M*g = 72 kg * 9.8 m/s² = 705.6 N : Weight of the fire fighter(vertical downward)

FN₁ :Normal force that the floor exerts on the ladder (vertical upward) (point A)

fs : friction force that the floor exerts on the ladder (horizontal and opposite the movement )(point A)

FN₂ : Normal Force that the wall exerts on the ladder ( horizontal and opposite to friction force between the floor and the ladder)

∑Fy=0

FN₁ -W₁ -W₂= 0

FN₁ = W₁ + W₂

FN₁ = 441N+ 705.6N

FN₁ = 1146.6N : Force exerted on the ladder by the wall (vertical and upward)

Calculation of the distances of the forces at the point A (contact point of the ladder on the floor)

d₁ = 4*cos 50.8° (m) = 2.53 m: Distance from W₁ to the point A

d₂ =6*cos 50.8° (m)= 3.79 m : Distance from W₂ to the point A

d₃ = 9.3 m : Distance from FN₂ to the point A

The equilibrium equation of the moments at the point A (contact point of the ladder with the floor)

∑MA = 0

FN₂(d₃) - W₁( d₁) - W₂(d₂) = 0

FN₂(d₃) = W₁(d₁) + W₂(d₂)

FN₂(9.3) = (441 )(2.53) + (705.6)( 3.79 )

FN₂(9.3) = 1115.73 + 2674.2

FN₂ = (3790) / (9.3)

FN₂ = 407.5 N : Force exerted on the ladder by the wall , horizontal and opposite to friction force between the floor and the ladder

8 0

4 years ago