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Inessa05 [86]
3 years ago
8

Which if the following doesn't cause an object to accelrate it's q 4

Physics
2 answers:
GarryVolchara [31]3 years ago
7 0

Change in direction, slowing down, and speeding up are all CHANGES of velocity, and THAT's called acceleration.

Constant velocity isn't a change of velocity, so it isn't called acceleration.

Slav-nsk [51]3 years ago
6 0

B. Constant velocity


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Leviafan [203]

Answer:

ω = 0.571 rad/s

Explanation:

given data

radius = 30 m

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we take here g = 9.8 m/s²

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g = r × ω²     ....................1

put here value and we get

9.8 = 30 × ω²

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ω = 0.571 rad/s

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If light moves from left to right along the x-axis, then the electric field line vibrates along what?? :(
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Which of the following is not a valid conversion factor?
kykrilka [37]
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3 years ago
a body of mass 0.2kg is whirled round a horizontal circle by a string inclined at 30 degrees to the vertical calculate <br /&
Katen [24]

Answer:

a)  T = 2.26 N, b) v = 1.68 m / s

Explanation:

We use Newton's second law

Let's set a reference system where the x-axis is radial and the y-axis is vertical, let's decompose the tension of the string

        sin 30 = \frac{T_x}{T}

        cos 30 = \frac{T_y}{T}

        Tₓ = T sin 30

        T_y = T cos 30

Y axis  

       T_y -W = 0

       T cos 30 = mg                     (1)

X axis

        Tₓ = m a

they relate it is centripetal

        a = v² / r

we substitute

         T sin 30 = m\frac{v^2}{r}            (2)

a) we substitute in 1

         T = \frac{mg }{cos 30}

         T = \frac{ 0.2 \ 9.8}{cos  \ 30}

         T = 2.26 N

b) from equation 2

           v² = \frac{T \ sin 30 \ r}{m}

If we know the length of the string

          sin 30 = r / L

          r = L sin 30

we substitute

          v² = \frac{ T \ sin 30 \ L \ sin 30}{m}

          v² = \frac{TL \ sin^2  30}{m}

For the problem let us take L = 1 m

let's calculate

          v = \sqrt{ \frac{2.26 \ 1 \ sin^230}{0.2} }

          v = 1.68 m / s

8 0
3 years ago
A boy got out of a boat and as he
emmainna [20.7K]

Answer:

third law of motion

Explanation:

6 0
4 years ago
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