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melomori [17]
3 years ago
12

What is the average velocity of the object between 14 and 22 seconds

Physics
2 answers:
anastassius [24]3 years ago
4 0
Use the slope equation. It’s 1-8 Meters which is 7. And it’s 22-14 seconds. So the answer is d

Natalka [10]3 years ago
4 0

Answer:

v = - 0.88 m/s

Explanation:

Average velocity is defined as the ratio of displacement and time

so here as we can see that the displacement is the change in the position of the object

initially object is placed at x = 8 m

final position of the object is x = 1

so the displacement is given as

d = x_f - x_i

d = 1 - 8 = -7 m

now the time taken by the object

\Delta t = 22 - 14 = 8 s

now by the formula of average velocity we know

v = \frac{displacement}{time}

v = \frac{-7}{8} = - 0.88 m/s

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An explosive projectile is launched straight upward to a maximum height h. At its peak, it explodes, scattering particles in all
Varvara68 [4.7K]

Answer:

θ = tan⁻¹ (\frac{19.6 \ h}{v})

Explanation:

This problem must be solved using projectile launch ratios. Let's analyze the situation, the projectile explodes at the highest point, therefore we fear the height (i = h), the speed at this point is the same, but the direction changes, we are asked to find the smallest angle of the speed in the point of arrival with respect to the x-axis.

The speed at the arrival point (y = 0)

           v² = vₓ² + v_y²

Let's see how this angle changes, for two extreme values:

* The particle that falls from the point of explosion, in this case the speed is vertical

         v = v_y

the angle with the horizontal is 90º

* The particle leaves horizontally from the point of the explosion, the initial velocity is horizontal

         vₓ = v

the final velocity for y = 0

         v_f = vₓ² + v_y²

therefore the angle has a value greater than zero and less than 90º

As they ask for the smallest angle, we can see that we must solve the last case

the output velocity is horizontal vₓ = v

Let's find the velocity when it hits the ground y = 0, with y₀ = h

            v_{y}^2 = v_{oy}^2 - 2 g (y-y₀)

            v_{y}^2 = - 2g (0- y₀)

let's calculate

           v_{y}^2 = 2 9.8 h

         

we use trigonometry to find the angle

        tan θ = \frac{v_y}{v_x}

        θ = tan⁻¹ (\frac{v_y}{v_x})

let's calculate

         θ = tan⁻¹ (\frac{19.6 \ h}{v})

3 0
2 years ago
WA
brilliants [131]

Answer:

the answers the correct one is d

Explanation:

The speed of sound is constant so we can use the relations of uniform motion

           v = x / t

            x = v t

now let's calculate the distance for each person

t = 5s

         x₁ = 300 5

         x₁ = 1500 m

t = 6s

         x₂ = 300 6

         x₂ = 1800 m

therefore we have two possibilities

a) the two people are on the same side, therefore the distance between them is

         Δx = x₂- x₁

         Δx = 1800 - 1500

         Δx = 300 m

       

let's reduce to km

         Δx = 0.300 km

b) people are on opposite sides of the sound

         Δx = x₂ + x₁

         Δx = 1800 + 1500

         Δx = 3300 m

         Δx = 3.3 km

when checking the answers the correct one is d

3 0
2 years ago
If your runnin at full speed for an average human, and lept over a 10 foot brook would you make it?
Vika [28.1K]
Unless you are a mutant....I don't think you would make it. I'm 5'8" and most people are 6'7" or less. It's bsically impossible to do. :)
7 0
3 years ago
Read 2 more answers
A cat with a mass of 5.00 kg pushes on a 25.0 kg desk with a force of 50.0N to jump off. What is the force on the desk?
olya-2409 [2.1K]

Answer:

First of all the formula is F= uR,( force= static friction× reaction)

mass= 5+25=30

F= 50

R= mg(30×10)=300

u= ?

F=UR

u= F/R

u= 50/300=0.17N

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Clutter is _______. annoying frustrating death
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Answer: _____= beautiful, yet annoying frustrating death

Explanation:

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