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g100num [7]
3 years ago
15

If a bust starts to move and its velocity becomes 90 km after 8 seconds . calculate its acceleration answer it quick please

Physics
1 answer:
kherson [118]3 years ago
3 0

Answer:

a = 3.125 [m/s^2]

Explanation:

In order to solve this problem, we must use the following equation of kinematics. But first, we have to convert the speed of 90 [km/h] to meters per second.

90\frac{km}{h}*\frac{1000m}{1km}*\frac{1h}{3600s}   \\= 25 \frac{m}{s}

v_{f} =v_{i} + (a*t)

where:

Vf = final velocity = 25 [m/s]

Vi = initial velocity = 0

a = acceleration [m/s^2]

t  = time = 8 [s]

The initial speed is zero as the bus starts to koverse from rest. The positive sign of the equation means that the bus increases its speed.

25 = 0 + a*8

a = 3.125 [m/s^2]

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Answer:

They are the same

Explanation:

Electromagnetic waves consist of perpendicular oscillations of electric and magnetic field, which oscillate perpendicularly to the direction of motion of the wave (transverse wave). One property of the electromagnetic waves is that they travel in a vacuum always at the same speed, called speed of light:

c=3.0\cdot 10^8 m/s

Electromagnetic waves are classified into 7 different types according to their frequency; from highest to lowest frequency, we have:

Gamma rays

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We see that both visible light and gamma rays are electromagnetic waves, so they both travel in a vacuum at the same speed, the speed of light.

3 0
3 years ago
A ball is thrown vertically upward from the ground. Its distance in feet from the ground in t seconds is s equals negative 16 t
marishachu [46]

Answer:

t₁ = 3 s

Explanation:

In this exercise, the vertical displacement equation is not given

        y = 240 t + 16 t²

Where y is the displacement, 240 is the initial velocity and 16 is half the value of the acceleration

Let's replace

      864 = 240 t + 16 t²

Let's solve the second degree equation

    16 t² + 240 t - 864 = 0

Let's divide by 16

    t² + 15 t - 54 = 0

The solution of this equation is

     t = [-15 ± √(15 2 - 4 1 (-54)) ] / 2 1

     t = [-15 ±√(225 +216)] / 2

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We have two solutions.

     t₁ = [-15 +21] / 2

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     t₂ = -18 s

Since time cannot have negative values, the correct t₁ = 3s

4 0
3 years ago
The first version of a product, which is built and tested during the third stage of technological design, is called a​
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Answer:

The third stage of parturition is called " after-birth".

Explanation:

8 0
3 years ago
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A soccer ball is kicked horizontally. What is the average speed if its distance is 21.0 m after 4.00 s?
Over [174]
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5 0
3 years ago
The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this pr
steposvetlana [31]

Answer:

Explanation:

Given that:

distance (z) = 7.86 m

mass of the person = 81.7 kg

Acceleration (a) = 0.729 m/s²

By using Newton's second law along the vertical axis:

T - mg = ma\\ \\ T = ma + mg \\ \\  T = m(a+g) \\ \\

T = 81.7 (0.729 +9.8)

T = 860.22 N

The work done now is:

W_T = T\times z \\ \\

W_T = 860.22 \times 7.86

\mathbf{W_T =6761.3292\ N}

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