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4 years ago

What is vector quantities?

Physics

1 answer:

WINSTONCH [101]4 years ago

5 0

Answer: Vector quantity is a measurement that has both magnitude and direction.

Explanation:

Vector quantity is a measurement that has both magnitude and direction. Examples are force, acceleration, displacement and velocity.

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4 years ago

A cylinder with radius R spins around its axis with an angular speed ω. On its inner surface, there lies a small block; the coef

ValentinkaMS [17]

Answer:

A. Mrŵ² = ųMg

Ŵ = (ųg/r)^½

Ŵ =[ (g /r)* tan á]^½

Explanation:

T.v.= centrepetal force = mrŵ²

Where m = mass of block,

r = radius

Ŵ = angular momentum

On a horizontal axial banking frictional force supplies the Pentecostal force is numerically equal.

So there for

Mrŵ² = ųMg

Ŵ = (ųg/r)^½

g = Gravitational pull

ų = coefficient of friction.

B. The net external force equals the horizontal centerepital force if the angle à is ideal for the speed and radius then friction becomes negligible

So therefore

N *(sin á) = mrŵ² .....equ 1

Since the car does not slide the net vertical forces must be equal and opposite so therefore

N*(cos á) = mg.....equ 2

Where N is the reaction force of the car on the surface.

Equ 2 becomes N = mg/cos á

Substituting N into equation 1

mg*(sin á /cos á) =mrŵ²

Tan á = rŵ²/g

Ŵ =[ (g /r)* tan á]^½

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3 years ago

A satellite has a mass of 5850 kg and is in a circular orbit 4.1 x10 to the 5th power m above the surface of a planet. The perio

koban [17]

Answer:

W = 24.28 kN

Explanation:

given,

Mass of satellite = 5850 Kg

height , h = 4.1 x 10⁵ m

Radius of planet = 4.15 x 10⁶ m

Time period = 2 h

= 2 x 3600 = 7200 s

Time period of satellite

$T = \dfrac{2\pi}{R}\sqrt{\dfrac{(R+h)^3}{g}}$

R is the radius of planet

h is the height of satellite

$T^2 = \dfrac{4\pi^2}{R^2}\ {\dfrac{(R+h)^3}{g}}$

now calculation of acceleration due to gravity

$g = \dfrac{4\pi^2}{R^2}\ {\dfrac{(R+h)^3}{T^2}}$

$g = \dfrac{4\pi^2}{(4.15\times 10^6)^2}\ {\dfrac{(4.15\times 10^6+4.1\times 10^5)^3}{(7200)^2}}$

g = 4.15 m/s²

True weight of satellite

W = m g

W = 5850 x 4.15

W = 24277.5 N

W = 24.28 kN

True weight of the satellite is W = 24.28 kN

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3 years ago

Which of the following is a graph of the velocity of an object as it falls fromrest if drag is not ignored? Explain your choice

MariettaO [177]

The air drag is a force that depends on the speed of an object relative to the wind. Under certain conditions, it can be modeled as:

$F=-bv$

Where b is a constant.

As a falling object reaches a speed so that its weight is cancelled out by the air drag, the object will reach a maximum velocity.

In a speed vs time gaph, the speed would approach the maximum speed like an asymptote.

On the other hand, since the object falls from rest, the initial speed on the graph must be zero.

Taking these considerations into account, the correct graph for the movement of an object that falls from rest if air drag is not ignored, is option B.

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