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3 years ago

Although we talk about the velocity of an object in Uniform Circular Motion as being

Physics

2 answers:

DaniilM [7]3 years ago

8 0

Answer:

The speed is constant.

Speed is a scalar quantity (magnitude only).

Velocity is a vector quantity (magnitude and direction).

For an object in Uniform Circular Motion the change in velocity is always

directed towards the center of the circle, and this change of velocity

gives rise to the acceleration which is directed towards the center of

rotation. This is called the centripetal acceleration, and it is the centripetal

force (for instance the attraction of the moon towards the earth) which

produces the centripetal acceleration.

rodikova [14]3 years ago

3 0

Answer:

The speed is constant.

Explanation:

In reality in circular motion the velocity is never constant because the object keeps changing direction in a continuous fashion. Remember velocity is measured by magnitude and direction. However we use the term constant velocity to mark constant speed for convenience.

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An archer wants to hit a target that is dropped from a tower. At the sound of a horn, the archer is to shoot an arrow; at the sa

bija089 [108]

It has to be D because the arrow will drop as it moves, if it were a gun, you'd lead the target so fire below it, but due to it being an arrow, you aim high not low. Also, they didnt specify how fast anything is, so you'd probably miss if you actually did it.

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3 years ago

Read 2 more answers

When you double your speed, it takes about _____ times as much distance to stop?

Zigmanuir [339]

4 times as much distance to stop

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3 years ago

An overhead electric power line carries a maximum current of 125 A. What is the magnitude of the maximum magnetic field at a poi

BARSIC [14]

Answer:

B= 55.6×10^(-7) Tesla

Explanation:

B= μoI/(2πr)

B: magnetic field strength

μo: permeability of free space and is equal to 4π×10^(-7) T.m/A

r: distance from the wire

I : current in the wire

B= (4π×10^(-7)×125)/(2π×4.5)

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3 years ago

Which of the following determines whether light shining on a metal surface will eject electrons from that surface?

PtichkaEL [24]

From that list, only the frequency makes the difference.

Einstein won his only Nobel Prize for his explanation of this effect.

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3 years ago

1) A plane lands on a runway with a speed of 125 m/s, moving east, and it slows to a stop in 13.0 s. What is the magnitude (in m

valentina_108 [34]

Answer: 1) a = 9.61m/s² pointing to west.

2) (a) Δv = - 37.9km/s

(b) a = - 6.10⁷km/years

Explanation: Aceleration is the change in velocity over change in time.

1) For the plane:

$a=\frac{\Delta v}{\Delta t}$

$a=\frac{125}{13}$

a = 9.61m/s²

The plane is moving east, so velocity points in that direction. However, it is stopping at the time of 13s, so acceleration's direction is in the opposite direction. Therefore, acceleration points towards west.

2) Total change of velocity:

$\Delta v = v_{f}-v_{i}$