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ANEK [815]
3 years ago
9

An emu moving with constant acceleration covers the distance between two points that are 92 m

Physics
1 answer:
nasty-shy [4]3 years ago
8 0

Answer:

a) V_{o}=14.30 m/s

b) a=-0.046 m/s^{2}

Explanation:

The complete question is written below:

An emu moving with constant acceleration covers the distance between two points that are 92 m  apart in 6.5s. Its speed as it passes the second point is 14 m/s. What are (a) its speed at the first point and (b) its acceleration?

Since we are talking about constant acceleration, we can use the following equations:

d=x-x_{o}=(\frac{V_{o}-V}{2})t (1)

V=V_{o}+at (2)

Where:

d=92 m is the distance between the two points

V_{o} is the velocity of the emu at the first point

V=14 m/s is the velocity of the emu at the second point

t=6.5 s is the time it takes to the emu to cover the distance d

a is the emu's constant acceleration

Knowing this, let's begin with the answers:

<h2>a) Speed at the first point</h2>

In this situation wi will use equation (1):

d=(\frac{V_{o}-V}{2})t (1)

Finding V_{o}:

V_{o}=\frac{2d}{t}-V (3)

V_{o}=\frac{2(92 m)}{6.5 s}-14 m/s (4)

V_{o}=14.30 m/s (5)

<h2>b) Emu's acceleration</h2>

Now we will substitute (5) in equation (2):

14 m/s=14.30 m/s+a(6.5 s) (6)

Finding a:

a=-0.046 m/s^{2} (7) This means the emu is decreasing its speed at a constant rate.

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________________________________________________

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==>  1,188 megajoules

==>  1.188 gigajoules

Atsa nawfulotta energy ! 
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3 years ago
Which set of shapes contains members that are always similar to one another?
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2 years ago
An object with total mass mtotal = 16.2 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.7 k
vichka [17]

Answer:

1.) 0 kgm/s

2) 6.3 kg

3) -0.0978 m/s

4)

5)

6)

An object with total mass mtotal = 16.2 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.7 kg moves up and to the left at an angle of θ1 = 23° above the –x axis with a speed of v1 = 25.4 m/s. A second piece with mass m2 = 5.2 kg moves down and to the right an angle of θ2 = 28° to the right of the -y axis at a speed of v2 = 23.8 m/s.

2) What is the mass of the third piece?

3) What is the x-component of the velocity of the third piece?

4) What is the y-component of the velocity of the third piece?

5) What is the magnitude of the velocity of the center of mass of the pieces after the collision?

6) Calculate the increase in kinetic energy of the pieces during the explosion

Explanation:

Since explosions and collisions follow the law of conservation of Momentum.

1) Magnitude of the final momentum of the system = Magnitude of the initial momentum of the system

Since the body was initially at rest,

Magnitude of the initial momentum of the system = 0 kgm/s

Hence, Magnitude of the final momentum of the system is also equal to 0 kgm/s.

2) mass of the third piece

Sum of all the masses = 16.2 kg

4.7 + 5.2 + c = 16.2

c = 6.3 kg

3) doing an x-component balance on momentum

(4.7)×(-25.4 cos 23) + (5.2)×(23.8 cos 28) + (6.3)(v) = 0

-0.6163 + 6.3v = 0

v = -0.0978 m/s

Hope this Helps!!!

4 0
3 years ago
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