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4 years ago

What three properties does an aircraft need to fly? Describe in one or more paragraphs.

Physics

1 answer:

ziro4ka [17]4 years ago

6 0

The three properties in which an aircraft needs to fly would be: wind, wings, and gravity. Hope that makes sense.

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Which of the following are examples of projectile motion?

denis-greek [22]

Answer:

A or C I would pick C

Explanation:

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4 years ago

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Which pair of graphs represent the same motion of an object

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To be able to identify that the object is in the same motion, we should find the graphs that has an increasing slope of displacement and with the constant velocity with varying time. Graphs on letter D satisfies these requirements.

ANSWER: D

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4 years ago

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A car of mass 1000.0 kg is traveling along a level road at 100.0 km/h when its brakes are applied. Calculate the stopping distan

OleMash [197]

Explanation:

It is given that,

Mass of the car, m = 1000 kg

Speed of the car, v = 100 km/h = 27.77 m/s

The coefficient of kinetic friction of the tires, $\mu_k=0.5$

Let f is the net force acting on the body due to frictional force, such that,

$-f=ma$

$a=\dfrac{-f}{m}$

$a=\dfrac{-\mu _k mg}{m}$

$a=\mu_k g$

$a=-0.5\times 9.8$

$a=-4.9\ m/s^2$

We know that the acceleration of the car in calculus is given by :

$v.dv=a.dx$ , x is the stopping distance

$\int\limits^0_v {v.dv}=\int\limits^x_0 {a.dx}$

$\dfrac{v^2}{2}|_v^0=ax$

$0-(27.77)^2=-2\times 4.9x$

On solving the above equation, we get, x = 78.69 meters

So, the stopping distance for the car is 78.69 meters. Hence, this is the required solution.

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3 years ago

A nuetral atom has no overall charge. Explain this in terms of its particles.

agasfer [191]

Firstly an atom has electrons , protons and neutrons. The protons are positively charged and the electrons are negatively charged and the neurons are neutral. So in a neutral atom the amount of protons equals to the amount of electrons. Thus the protons and neutrons can be called particles

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4 years ago

What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N

Amanda [17]

The answer is B. 49 N

Force is equal to the mass of that object multiplied by its acceleration:

F = m × a 
The unit of force is N = kg * m/s².

It is given:
m = 0.25 kg
a = 196 m/s²

F = m × a = 0.25 kg × 196 m/s² = 49 N

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3 years ago

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