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4 years ago

Define state of rest.

Physics

1 answer:

Luden [163]4 years ago

3 0

Answer:

The answer is related to physics

Explanation:

In physics, rest is the state of an object being stationary relative to a particular frame of reference or another object; when the position of a body with respect to its surroundings does not change with time it is said to be "at rest". According to the theory of relativity, it is said that an object is "at rest relative to" another. For example, a train decelerates approaching a station and eventually comes to rest alongside the platform. The train can be said to be "at rest with respect to the station", or, as the correct frame of reference is usually implicit and/or provided by context, simply "at rest". In reality, there is nothing at absolute rest. For example, Earth's gravitation constantly pulls objects toward its surface, while Earth is one of the objects the Sun constantly pulls towards itself, causing it to orbit the Sun; the Sun, in turn, orbits the center of the Milky Way; and so on.

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Why is it that, in a spoon, you can see yourself upside down? Bamboozled me for years.

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4 years ago

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bezimeni [28]

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4 years ago

How long will it take a cyclist to accelerate to 12 m/s starting from rest if he rides with an average acceleration of 1.2 m/s^2

igor_vitrenko [27]

Answer:

<em>The cyclist takes 10 seconds to accelerate to 12 m/s.</em>

Explanation:

<u>Constant Acceleration Motion</u>

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

$v_f=v_o+at$

Solving for t:

$\displaystyle t=\frac{v_f-v_o}{a}$

The cyclist starts from rest (vo=0) and moves at vf=12 m/s with an acceleration $a=1.2\ m/s^2$ .

Calculate the time:

$\displaystyle t=\frac{12-0}{1.2}$

$\displaystyle t=\frac{12}{1.2}$

$\boxed{t=10\ sec}$

The cyclist takes 10 seconds to accelerate to 12 m/s.

3 0

3 years ago

Select inductive reasoning, deductive reasoning, or neither.

JulsSmile [24]

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4 0

4 years ago

Read 2 more answers

A series RCL circuit contains a 65.2-Î© resistor, a 2.26-Î¼F capacitor, and a 2.08-mH inductor. When the frequency is 2400 Hz, w

raketka [301]

Answer:

The power factor of the circuit is 0.99

Explanation:

Given;

resistance of the resistor, R = 65.2 ohms

capacitance of the capacitor, C = 2.26 μF = 2.26 x 10⁻⁶ F

inductance, L = 2.08 mH = 2.08 x 10⁻³ H

frequency of the AC, f = 2400 Hz

The angular frequency is given by;

ω = 2πf

ω = 2π(2400) = 15081.6 rad/s

The inductive reactance is given by;

XL = ωL

XL = (15081.6 x 2.08 x 10⁻³)

XL = 31.37 ohms

The capacitive reactance is given by;

$X_c = \frac{1}{\omega C} \\\\X_c = \frac{1}{(15081.6)(2.26*10^{-6} )}\\\\X_c = 29.34 \ ohms$

The phase difference is given by;

$tan\phi = \frac{X_l - X_c}{R}\\\\ tan\phi =\frac{31.37-29.34}{65.2} \\\\tan\phi = 0.0311 \\\\\phi = tan^{-1} (0.0311)\\\\\phi = 1.78^0$

The power factor is given by;

CosФ = Cos(1.78) = 0.99

Therefore, the power factor of the circuit is 0.99

5 0

3 years ago