Use Newton's first law of motion to explain why air bags in cars are important during head-on collisions.

Answers

Answer 1

Answer: Newton's First Law of Motion, or the Law of Inertia, states that objects at rest will stay at rest, or object in motion will stay in motion, unless acted upon by an outside force. Therefor if a person is riding in a car going 80mph, and the car crashes head-on, the car will stop, but the person will keep moving at 80mph until it too is acted upon by an outside force, in this case the air bag. If there was no air bag, the person would collide with the car's dashboard or windshield.

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Compare and contrast ultraviolet light with infrared light using wavelength, frequency, and energy.

Answers

Ultraviolet light has a shorter wavelength (in its majority), higher frequency and emits higher amounts of energy than infrared. More specifically, the UV and infrared values are shown below: Ultraviolet Wavelength: From 10 nm to 380 nm Frequency: From 30 PHz to 750 THz Energy: From 3.1 eV to 124 eV Infrared Wavelength: From 1 mm to 750 nm Frequency: From 300 GHz to 430 THz Energy: From 0.0012 eV to 1.65 eV

Final answer:

Ultraviolet light has a shorter wavelength and higher frequency than infrared light. It also has more energy. Violet light, which is part of the ultraviolet spectrum, has a higher frequency and shorter wavelength than red light. Infrared radiation, on the other hand, has longer wavelengths and lower frequencies than violet light.

Explanation:

Ultraviolet light and infrared light are both forms of electromagnetic radiation, but they differ in terms of wavelength, frequency, and energy. Ultraviolet light has a shorter wavelength and higher frequency compared to infrared light. As a result, ultraviolet light has more energy than infrared light.

For example, violet light, which is part of the ultraviolet spectrum, has a higher frequency and shorter wavelength than red light. Ultraviolet radiation extends from about 400 nm to 10 nm and is produced by atomic and molecular motions and electronic transitions. In contrast, infrared radiation has longer wavelengths and lower frequencies than violet light.

It's important to note that shorter-wavelength ultraviolet light can cause damage to living cells and is better able to cause materials to fluoresce compared to visible light. On the other hand, infrared radiation is often associated with heat and is used for various purposes, such as remote control communication and thermal imaging.

Learn more about Ultraviolet and Infrared Light Comparison here:

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What is the distance a wave travels in one unit of time?

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That distance, divided by the time, is known as the wave's "speed".

Answer:

Speed

Explanation:

86 Km/h convertir a (m/min)

Answers

Answer: 1433.3 m/min

Explanation:

For 86 Km/h converted to a (m/min), convert kilometers to meters, and hour to minutes

So, 86 Km/h means 86 kilometers per 1 hour

- If 1 kilometer = 1000 metres

86 kilometers = 86 x 1000 = 86,000m

- If 1 hour = 60 minute

1 hour = 60 minutes

In m/min: (86,000m / 60 minute)

= 1433.3 m/min

Thus, 86 Km/h convert to 1433.3 m/min

if you have a mass of 55 kg and you are standing 3 meters away from your car, which has a mass of 1234 kg, how strong is the force of gravity between you and the car?

Answers

From Newton's gravitational law, the force of gravity between you and the car is 5.03 x $10^(-7)$ Newton strong.

NEWTON'S GRAVITATION LAW

According to Newton, the force of attraction between two masses of directly proportional to the product of the masses and inversely proportional to the square of the distance between them. That is,

F = $(GMm)/(r^(2) )$

From the question, the given parameters are

M = 1234 kg

m = 55 kg

r = 3 m

G = 6.67 x $10^(-11)$ N $m^(2)kg^(-2)$

Substitute all the parameters into the formula

F = (6.67 x $10^(-11)$ x 1234 x 55) / $3^(2)$

F = 4.527 x $10^(-6)$ / 9

F = 5.03 x $10^(-7)$ N

Therefore, the force of gravity between you and the car is 5.03 x $10^(-7)$

Newton strong.

Learn more about Gravitational force here: brainly.com/question/2537310

Gravitational force between two masses is given by formula

$F = (Gm_1m_2)/(r^2)$

here we know that

$m_1 = 55 kg$

$m_2 = 1234 kg$

$r = 3 m$

$G = 6.67 * 10^(-11) Nm^2/kg^2$

now from the above equation we will have

$F = ((6.67 * 10^(-11))(55)(1234))/(3^2)$

$F = 5.03 * 10^(-7)N$

so above is the gravitational force between car and the person

What is the kinetic energy of a 1 kg ball thrown into the air with an initial velocity of 30 m/s

Answers

Welll ... we can do the math and the physics and get an answer
for you, but then we'll really want to step back into the real world
and see how feasible all of this is.

Kinetic Energy = (1/2) (mass) (speed)²

      = (1/2) (1 kg) (30 m/s)²

      = (1/2) (1 kg) (900 m²/s²)

      = 450 kg-m²/s² = 450 joules .

That's the KE of the ball at the instant it leaves your hand,
moving at 30 m/s . Immediately after that, we don't know
what happens to it. It may lose speed, if you tossed it upward,
or it may gain speed, if you tossed it downward or horizontally.
As soon as its speed changes, so does its KE.

And now, a word from the real world:
' 30 m/s ' is about 67 miles per hour, and the ball weighs a little
over 2 pounds. Do you really think you could make that toss ?

A cylindrical rod of mass M. length L and radius R has two cords wound around it whose ends are ato the ceiling as shown. The rod is held horizontally with the two cords vertical. When the rod s mecase
cords unwind the rod rotates. Find the tension in the cords as they unwind.

Answers

Answer:

T = mg/6

Explanation:

Draw a free body diagram (see attached). There are two tension forces acting upward at the edge of the cylinder, and weight at the center acting downwards.

The center rotates about the point where the cords touch the edge. Sum the torques about that point:

∑τ = Iα

mgr = (1/2 mr² + mr²) α

mgr = 3/2 mr² α

g = 3/2 r α

α = 2g / (3r)

(Notice that you have to use parallel axis theorem to find the moment of inertia of the cylinder about the point on its edge rather than its center.)

Now, sum of the forces in the y direction:

∑F = ma

2T − mg = m (-a)

2T − mg = -ma

Since a = αr: