2 years ago

What is the velocity of a plane that traveld 3000 miles from new york to california in 5.0 hours

Physics

1 answer:

JulijaS [17]2 years ago

7 0

The Velocity is 666.67 mph

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A skydiver is falling at constant velocity. If a force of 600 N is pulling down on the skydiver, how much force must be acting u

skelet666 [1.2K]

Well, if the skydiver is at constant velocity, than there’s no acceleration, as stated by Newton’s first law. Thus the total net force would equate to 0. In order to make this statement true, the answer would have to be exactly 600 N.

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3 years ago

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A horizontal 2.00\ m2.00 m long, 5.00\ kg5.00 kg uniform beam that lies along the east-west direction is acted on by two forces.

Sunny_sXe [5.5K]

Answer: $240\ rad/s^2$

Explanation:

Given

Length of beam $l=2\ m$

mass of beam $m=5\ kg$

Two forces of equal intensity acted in the opposite direction, therefore, they create a torque of magnitude

$\tau =F\times l=200\times 2=400\ N.m$

Also, the beam starts rotating about its center

So, the moment of inertia of the beam is

$I=\dfrac{ml^2}{12}=\dfrac{5\times 2^2}{12}\\\\I=\dfrac{5}{3}\ kg.m^2$

Torque is the product of moment of inertia and angular acceleration

$\Rightarrow \tau=I\alpha\\\\\Rightarrow 400=\dfrac{5}{3}\times \alpha\\\\\Rightarrow \alpha =240\ rad/s^2$

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3 years ago

a soccer player kicks a ball. According to Newton's third law of motion, the player's foot exerts a force on the ball. The ball

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Answer:

The forces are exerted on different objects so they are not balanced forces.

Explanation:

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3 years ago

Calculate the critical angle for Zircon which has a refractive index of n = 2*

MA_775_DIABLO [31]

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Given that refractive index of the material is √2. i.e. n = √2. Hence, critical angle for the material is 45°

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Explanation:fjdj

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