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3 years ago

What is kinematics?explain!!~thankyou ~

Physics

2 answers:

Hatshy [7]3 years ago

6 0

Answer:

<u>Kinematics:-</u>

Branch of mechanics concerned
Features of motion in an object
Causes and effects of motions

Hope it helps!

WARRIOR [948]3 years ago

4 0

Answer:

<h2>KINEMATICS; kinematics is the study of the motion of mechanicals , bodies ,and system , without ,considerations of their associeted physical properties and the forces acting on them</h2>

Explanation:

<h2>KINEMATICS: Kinematics is the study of objects in emotions there, ( velocity, acceleration, and momentum,)</h2>

<h2>#hope its help</h2><h2>#care on learning</h2><h2> pa brainlest nalang</h2>

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A beam of light in air is incident at an angle of 30º to the surface of a rectangular block of clear plastic (n = 1.46). The lig

Aneli [31]

Answer:

θ = 30°

Explanation:

Firts, the angle when the beam of light passes through the block cam be calculated using Snell Law:

$n_{1}sin(\theta_{1}) = n_{2}sin(\theeta_{2})$

<u>Where</u>:

n₁: is the index of refraction of the incident medium (air) = 1

θ₁: is the incident angle = 30°

n₂: is the medium 2 (plastic) = 1.46

θ₂: is the transmission angle

Hence, θ₂ is:

$sin(\theta_{2}) = \frac{n_{1}*sin(\theta_{1})}{n_{2}} = \frac{1*sin(30)}{1.46} = 0.34 \rightarrow \theta_{2} = 20.03 ^{\circ}$

Now, when the beam of light re-emerges from the opposite side, we have:

n₁: is the index of refraction of the incident medium (plastic) = 1.46

θ₁: is the incident angle = 20.03°

n₂: is the medium 2 (air) = 1

θ₂: is the transmission angle

Hence, the angle to the normal to that surface (θ₂) is:

$sin(\theta_{2}) = \frac{n_{1}*sin(\theta_{1})}{n_{2}} = \frac{1.46*sin(20.03)}{1} = 0.50 \rightarrow \theta_{2} = 30 ^{\circ}$

Therefore, we have that the beam of light will come out at the same angle of when it went in, since, it goes from air and enters to a plastic medium and then enters again in this medium to go out to air again. This was proved using the Snell Law.

I hope it helps you!

5 0

3 years ago

A swimmer moves through the water at 2.5 meters per second and experiences a drag force of 240 N. How much power is she generati

mote1985 [20]

-- There's a force of 240N pushing her backwards.

-- She's maintaining a steady speed (of 2.5 m/s) .

-- In order to maintain a steady speed (no acceleration),
the forces on her must be balanced. So she's maintaining
a steady force of 240N forward.

-- Every time she moves 1 m forward, she does work of
(force) x (distance) = 240 joules.

-- She moves 2.5 meters forward every second.
So she's doing (240 x 2.5) = 600 joules of work every second.

-- 600 joules per second = 600 watts .

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3 years ago

Convert: 77.0 cm = m

My name is Ann [436]

Explanation:

1 cm = 0.01 m

77.0 cm =0.77m

7 0

3 years ago

Usually wire resistance can be neglected. But we see the effect of it sometimes when a light dims as another high-current device

tangare [24]

Please find the figure attached below:

Answer:

a.Resistance of bulb= $R_{2}$ =192 ohm

b.power consumed by bulb after motor disconnection=74.609 W

Explanation:

<u>a.Resistance of bulb=</u> $R_{2}$ <u>=?</u>

As we know that $P=\frac{P^{2} }{R}$

putting R as resistance of bulb i.e. $R=R_{2}$

$P=\frac{V^{2}}{R_{2} }\\R_{2}=\frac{V^{2}}{P} \\ R_{2}=\frac{(120)^{2} }{75}\\ R_{2}=192ohm$

<u>b.power consumed by bulb after motor disconnection? </u>

from the figure we see that $R_{1}\ and\ R_{2}$ are in series so

$R_{eq}=R_{1} +R_{2} \\R_{eq}=192+0.5\\R_{eq}=192.5ohm$

current through their resistance is

$I_{eq}=\frac{V}{R_{eq} }\\ I_{eq}=\frac{120}{192.5 } \\I_{eq}=0.6233A$

Power consumed by bulb is

$P_{b} =I^{2}R\\\\ P_{b} =(0.6233)^{2}(192)\\\\P_{b} =74.609W$

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4 years ago

How does inertia affect a person who is not wearing a seatbelt during a collision?

deff fn [24]

Your body is accelerating at the same speed as the car. If the car stops and there is nothing to restrain you, the inertia will cause your body to keep traveling at the same speed and you will fly forward, possibly through the windshield.

5 0

3 years ago

What is kinematics?explain!!~​thankyou ~

What is kinematics?explain!!~thankyou ~