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3 years ago

A bus starts to move from rest. if if its velocity becomes 90 km per hour after 8s calculate its acceleration

Physics

1 answer:

lukranit [14]3 years ago

3 0

Answer:

11.25km/h²

Explanation:

Acceleration = Velocity / Time

Acceleration = 90 / 8

Acceleration = 11.25

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3 years ago

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A delivery truck leaves a warehouse and travels 3.20 km east. The truck makes a right turn and travels 2.45 km south to arrive a

boyakko [2]

Explanation:

It is given that,

Displacement of the delivery truck, $d_1=3.2\ km$ (due east)

Then the truck moves, $d_2=2.45\ km$ (due south)

Let d is the magnitude of the truck’s displacement from the warehouse. The net displacement is given by :

$d=\sqrt{d_1^2+d_2^2}$

$d=\sqrt{3.2^2+2.45^2}$

d = 4.03 km

Let $\theta$ is the direction of the truck’s displacement from the warehouse from south of east.

$\theta=tan^{-1}(\dfrac{2.45}{3.2})$

$\theta=37.43^{\circ}$

So, the magnitude and direction of the truck’s displacement from the warehouse is 4.03 km, 37.4° south of east.

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3 years ago

approximation to the average velocity in that time interval, what should be the sequence of calculations?Update the (vector) pos

Klio2033 [76]

Answer:

The steps are outlined in the explanation below.

Explanation:

The average velocity is derived midpoint from the initial to the final velocity. Here is the proof:

Find the total displacement:

let the displacement be given by the letter s

Then since the average velocity is defined as: $v_{av} = \frac{x - x_{0} }{t - t_{0} }$

where t = final time

t₀ = initial time

v = final speed

v₀ = initial time

where x denotes the position, then

$v_{ave} = \frac{v+v_{0} }{2}$

where v = $\frac{dx}{dt}$ and dx = change in distance with respect to time.

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3 years ago

Which of the following factors most affect the rate at which waves erode land features along the shore?

OLEGan [10]

Answer:

The biggest factor affecting coastal erosion is the strength of the waves breaking along the coastline. A wave's strength is controlled by its fetch and the wind speed. Longer fetches & stronger winds create bigger, more powerful waves that have more erosive power.

Explanation:

hope it helps !

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2 years ago

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A guitar string vibrates at a frequency of 330Hz with wavelength 1.40m. The frequency and wavelength of this sound wave in air (

bixtya [17]

Answer:

Same frequency, shorter wavelength

Explanation:

The speed of a wave is given by

$v=f\lambda$