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Advocard [28]
2 years ago
7

Indicate whether the following statements are always true or can be false. An object's velocity will change if a net force acts

on the object. In order not to slow down, a car moving at a constant velocity needs a small net force applied. The net force which acts on an object which remains at rest is zero. If an object's speed does not change, no net force is acting on the object. If two objects are under the influence of equal forces, they have the same acceleration. During the collision of a car with a large truck, the truck exerts a greater force on the car than the car exerts on the truck.
Physics
1 answer:
Sergio [31]2 years ago
3 0

Answer:

1-An object's velocity will change if a net force acts on the object. (True)

2-In order not to slow down, a car moving at a constant velocity needs a small net force applied. (False)

3- The net force which acts on an object which remains at rest is zero. (True)

4- If an object's speed does not change, no net force is acting on the object.(True)

5- If two objects are under the influence of equal forces, they have the same acceleration. (False)

6- During the collision of a car with a large truck, the truck exerts a greater force on the car than the car exerts on the truck.(False) (Newton Third Law)

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What is the weight of an object with a mass of 19 kg?
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Using equations, determine the temperature, pressure and density of the air for a aircraft flying at 19.5 km. Is this aircraft s
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Answer:

a) - 72.5°c

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c) density =  0.063 kg/m^3

d) it is a subsonic aircraft

Explanation:

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T = -131 + ( 0.003 * altitude in meters )

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b) Determine pressure and density at 19.5 km altitude

Given :

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R ( gas constant of air ) = 0.287 KJ/Kgk

T = -72.5°c ≈ 200.5 k

pressure = 3625.13 Pa

hence density = 0.063 kg/m^3

attached below is the remaining part of the solution

C) determine if the aircraft is subsonic or super sonic

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4 0
2 years ago
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Answer:

1.01 × 10⁵ Pa  

Explanation:

At the surface, atmospheric pressure is 1.013 × 10⁵ Pa.

We need to find the total pressure on the air in the lungs of a person to a depth of 1 meter.

Pressure at a depth is given by :

P=\rho gh

Where

\rho is the density of air, \rho=1.225\ kg/m^3

So,

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Total pressure, P = Atmospheric pressure + 12 Pa

= 1.013 × 10⁵ Pa + 12 Pa

= 1.01 × 10⁵ Pa

Hence, the total pressure is 1.01 × 10⁵ Pa.

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2 years ago
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