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3 years ago

I will mark you as brainliest. if you answer my question

Physics

1 answer:

Shalnov [3]3 years ago

5 0

First, let's list everything we have...

a = 1.83 m/s^2

F = 1870 N (converted from kN to N)

vi = 0 m/s (it says started from rest, therefore velocity starts at 0)

t = 16 s

1). "Force acting on the car" is a bit ambiguous because there are many forces. But I'm going to assume that they are looking for just a basic implementation of force equation:

$F=ma$

where:

F = force

m = mass

a = acceleration

2). I recommend memorizing your equations of motion, because once you know them this part is also just as easy:

$v_f=v_i+at$

where:

vf = final velocity

vi = initial velocity

a = acceleration

t = time

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An airplane traveling 245 m/s east experiences turbulence, so the pilot slows down to 230 m/s. It takes the pilot 7

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Answer:

The acceleration of the plane is -2.14 m/s² ⇒ 2nd answer

Explanation:

Acceleration is the rate of change of velocity

The unit for acceleration is meters per second square

The rule of the acceleration is: → $a=\frac{v-u}{t}$

where a is the acceleration, u is the initial velocity, v is the final velocity

and t is the time

An airplane traveling 245 m/s east experiences turbulence so the pilot

slows down to 230 m/s

It takes the pilot 7 seconds to slow down to this speed

We need to find the acceleration of the plane

Lets use the rule above

→ u = 245 m/s , v = 230 m/s , t = 7 seconds

→ $a=\frac{230-245}{7}$

→ $a=\frac{-15}{7}=-2.14$

→ The acceleration is -2.14 m/s²

The acceleration of the plane is -2.14 m/s²

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3 years ago

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The tendency of an object to want to stay in motion or at rest is called

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3 years ago

A pinhole camera is just a rectangular box with a tiny hole in one face. The film is on the face opposite this hole, and that is

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Answer:

Size of image: 1.8 cm inverted

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Explanation:

Given:

$h_o$ = size of bird = 18 cm

$u$ = distance of the bird from the camera = 2 m = 200 cm

$v$ = distance of the film from the camera = 20 cm

Assume:

$m$ = magnification of the camera

$h_i$ = size of image of the bird

Using sign convention, we have

$u = -200\ cm\\v = 20\ cm\\h_o = 18\ cm$

The hole in the pinhole camera behaves as a convex lens. The other face opposite to the hole face behaves like a film where the image is formed to be seen. So, using the formula of magnification, we have

$m = \dfrac{h_i}{h_o}=\dfrac{v}{u}\\\Rightarrow \dfrac{h_i}{h_o}=\dfrac{v}{u}\\\Rightarrow h_i=\dfrac{v}{u}h_o\\\Rightarrow h_i=\dfrac{20}{-200}\times 18\\\Rightarrow h_i=-1.8 cm$

This means the image of the bird measures 1.8 cm in length where negative sign in the calculation represents that the image formed is inverted.

Hence, the image of the bird on the film is 1.8 cm large.

Now, again using the formula of magnification, we have

$m = \dfrac{h_i}{h_o}\\\Rightarrow m = \dfrac{-1.8}{18}\\\Rightarrow m =-0.1$

Hence, the magnification of the camera is -0.1.

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3 years ago

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Answer:

Explanation:

Given that

axle with a mechanical advantage of 3 and

a wedge with a mechanical advantage of 4?

Mechanical Advantage( M.A.) in a simple machine is defined as the ratio of the force that performs the useful work of a machine to the force that is applied to the machine.

Mechanical Advantage of Compound Machine = Product of mechanical advantages of the simple machines that it consists of, that is the mechanical advantage of wheel and axle multiplied by the mechanical advantage of wedge.

Therefore,

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