2 poin6. What is the speed of an earthquake wave if it has a wavelength of2300 m and a frequency of 3 Hz? *6900 m/s5300 m/s6000 m/s1300 m/s

Based on  Newton's first law of motion, the roller coaster will continue its motion in a straight line unless and external force (the break) acts on it.

In accordance with the law of conservation of energy, as the roller coaster moves from the top position to the lower position, its potential energy will be converted to kinetic energy.

Newton's first law of motion states that an object at rest or uniform motion in a straight line will continue in that path unless acted upon by an external force.

Based on  Newton's first law of motion, the roller coaster will continue its motion in a straight line unless and external force (the break) acts on it.

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Based on the law of conservation of energy, as the roller coaster moves from the top position to the lower position, its potential energy will be converted to kinetic energy.

The potential energy of the roller coaster is maximum at the highest position while the kinetic energy is maximum at the lowest position.

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The mass of the gift if it exert a normal force of 55 N is 5.61 kg.

Mass can be defined as the quantity of matter a body contains.

To calculate the mass of the gift, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the mass of the gift is 5.61 kg.

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Answer: This is an evolutionary adaption

Explanation:

As a result, practically all the heat you receive from a campfire when you are sitting next to one is transmitted through thermal radiation. Because of this, the side of your body that is facing the fire warms up, while the side that is facing away from it remains cool.

Since all the hot air is rising, you can actually fit your hand through the flame's base, which is also where the cold air from the surrounding space is drawn in. The flame's base is extremely chilly. You may reach through it and touch it with some soot.

Therefore, Heat is transferred through convection, which is the large-scale movement of molecules in fluids like liquid and gas. Consequently, one becomes warm while seated close to a fire.

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Because each mass has the same units we can sum them

The sum of the 3 masses is 1.4495g

The velocity and the acceleration of the ball after it has fallen

for 2.00 s  9.8 m/s.

Calculation:-

S = ut + 1/2 at²

  = 0 + 0.5 × 9.8 (2)²

 = 4.9 × 4

 = 19.6 m

v² = u² + 2aS

v² = 0 +2×9.8 × 19.6

  v  = √96.04 m

       =  9.8 m/s

Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.

Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.

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When the molecules of carbon dioxide is heated, it is disintegrated into molecules of carbon monoxide and oxygen atoms.

CO2 → CO + O

This is the basic reaction expected to happen by carbon dioxide molecules are heated. However it may also disintegrate into C2, O2, C, etc.

Since heat is absorbed in this reaction, it is an example of endothermic reaction. In an exothermic reaction heat is released. These are the basic two types of chemical reactions on basis of heat.

Therefore, when the molecules of carbon dioxide is heated, it is disintegrated into molecules of carbon monoxide and oxygen atoms.

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The final momentum of the body is equal to 120 Kg.m/s.

Momentum can be described as the multiplication of the mass and velocity of an object. Momentum is a vector quantity as it carries magnitude and direction.

If m is an object's mass and v is its velocity then the object's momentum p is: [tex]{\displaystyle \mathbf {p} =m\mathbf {v}[/tex] . The S.I. unit of measurement of momentum is kg⋅m/s, which is equivalent to the N.s.

Given the initial momentum of the body = Pi = 20 Kg.m/s

The force acting on the body, Pf = 25 N

The time, Δt = 4-0 = 4s

The Force is equal to the change in momentum: F ×Δt = ΔP

25 × 4 = P - 20

100 = P - 20

P = 100 + 20 = 120  Kg.m/s

Therefore, the final momentum of a body is 120 Kg.m/s.

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Answer:

Time 10.0 s

Explanation:

Given:

H = 494.9 m

V = 27.6 m/s

g = 9.8 m/s²

___________

t - ?

The fall time is found from the formula:

H = g·t² / 2

t = √ (2·H / g) = √ (2·494.9 / 9.8 ) ≈ 10.0 s

Attention! An extra given is speed. Find the distance from the base of the rock to the point where the stone fell:

L = V·t = 27.6·10.0 = 276 m

We know that the inital velity for this motion is 32 ft/s, this means that the height is given by:

a)

To determine at what time the projectile will reach 272 we plug s=272 in the equation above and solve for t:

since the discrimant of the equation is negative this means that the equation does not have real solutions.

This means that the projectile does not reach that height.

b)

To find at what time the projectile return to the ground we equate the expression for the height to zero and solve for t:

Therefore it takes 2 seconds for the projectile to return to the ground

Answer:

Approximately [tex]1.3\; {\rm m}[/tex] (assuming that [tex]g = 9.81\; {\rm m\cdot s^{-2}}[/tex], the table is level, and that air resistance on the coin is negligible.)

Explanation:

Assume that the air resistance on the coin is negligible. As long as the coin is in the air, its horizontal velocity of the coin will be constantly equal to the original value, [tex]v_{x} = 0.40\; {\rm m\cdot s^{-1}}[/tex].

It is given that the horizontal displacement of this coin is [tex]x_{x} = 0.20\; {\rm m}[/tex] during the flight. Divide this horizontal displacement by horizontal velocity to find the duration [tex]t[/tex] of the flight:

[tex]\begin{aligned} t &= \frac{x_{x}}{v_{x}} \\ &= \frac{0.20\; {\rm m}}{0.40\; {\rm m\cdot s^{-1}}} \\ &= 0.50\; {\rm s}\end{aligned}[/tex].

Also because air resistance on the coin is negligible, the vertical acceleration of the coin will be constantly [tex]a_{y} = (-g) = (-9.81)\; {\rm m\cdot s^{-2}}[/tex]. If the table is level, the initial vertical velocity of the coin [tex]u_{y}[/tex] will be [tex]0\; {\rm m\cdot s^{-1}}[/tex]. Apply the SUVAT equation [tex]x = (1/2)\, a\, t^{2} + u\, t[/tex] to find the vertical displacement of the coin during the [tex]t = 0.5\; {\rm s}[/tex] that it is in the air:

[tex]\begin{aligned}x_{y} &= \frac{1}{2}\, a_{y}\, t^{2} + u_{y}\, t \\ &= \frac{1}{2} \, (-9.81\; {\rm m\cdot s^{-2}})\, (0.5\; {\rm s})^{2} + (0\; {\rm m\cdot s^{-1}})\, (0.50\; {\rm s}) \\ &\approx (-1.3)\; {\rm m}\end{aligned}[/tex].

In other words, the coin lands approximately [tex]1.3\; {\rm m}[/tex] below the table edge. Hence, the height of the table would be approximately [tex]1.3\; {\rm m}\![/tex].

Answer: The watermelon

Explanation: The watermelon has a larger mass than the rest of the three.

Answer: The car slows down by 10 meters per second every second.

Explanation:

AnswerThe speed of a car is decreased uniformly from 30. meters per second to 10. meters per second in 4.0 seconds. What was the car's acceleration ?

We have the following data:

V (final velocity) = 10 m/s

Vo (initial velocity) = 30 m/s

ΔV  (speed interval)  = V - Vo → ΔV  = 10 - 30 → ΔV  = - 20 m/s

ΔT (time interval) = 4.0 seconds

a (average acceleration) = ? (in m/s²)

Explanation:

This problem indicates that the speed of light in a material medium is 0.5 10⁸ m / s, they ask to find the critical angle between the material and the vacuum.

Let's find the refractive index of the material

           n = c / v

          n = 3 10⁸ / 0.5 10⁸

          n = 6

When the material passes from one medium to another, it must comply with the law of refraction.

          n₁ sin θ = n₂ sin θ₂

for the angle criticize the angles tea2 = 90

         t = sin⁻¹n₂/ n₁

The vacuum replacement index is n₂ = 1

        t = sin⁻¹ (1/6)

        t = 9.59º

Therefore, the angle of refractive index will be 9.59°.

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[NOTE: THIS IS AN INCOMPLETE QUESTION. THE COMPLETE QUESTION IS: The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?]

The frictional force that the car experiences is 3,553.43 N.

The frictional force that the car experiences is calculated by applying Newton's second law of motion as follows;

Mathematically, the formula for frictional force is given as;

Ff = μFn

where;

Ff  = μmg

where;

The given parameters;

the mass of the car, m = 525.5 kg

the coefficient of friction = 0.69

Substitute the given parameters and solve for the frictional force that  the car experiences as it moves along the parent's garage.

Ff = 0.69 x 525.5 x 9.8

Ff = 3,553.43 N

Thus, the frictional force that the car experiences depends on the mass of the car and coefficient of friction.

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Astrolabe by measuring the sun's angles, this tool allowed sailors to determine their latitude, or where they were in relation to the equator of the planet. By keeping an eye on where the sun is in the sky, an astrolabe can also be used to tell time.

A magnetic compass is a tool used in surveying or navigation that uses a magnetic pointer that is aligned with the Earth's magnetic field to determine direction on the surface of the planet.

The north-south axis is the alignment point for magnets because of how powerful a magnet the Earth is. The Earth's rotational axis and the magnetic field's poles roughly line up. This indicates that the north geographic pole, also known as true north, and the north magnetic pole are nearly parallel. A light magnet that is free to move will align itself north-south. On the other hand, gravity and friction will prevent a heavy bar magnet from moving when it is placed on a tabletop.

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When a star moves toward or away from the earth, the light will be in a slightly different place in the spectrum from where a start would be at rest.

Due to the doppler effect, if a star moves toward the earth, the star's spectral lines will make a shift toward the blue end of the spectrum.

Therefore, the light waves from a star as the star moves toward the earth will appear to shift toward blue.

ANSWER:

B. They appear to shift toward blue.

CSP technologies can be used to generate electricity by converting sunlight energy to power a turbine, but the same basic technologies can also be used to deliver heat to a variety of industrial applications such as water desalination, enhanced oil recovery, food processing, chemical production, and mineral processing.

Concentrating  solar-thermal powertechnologies use mirrors to reflect and concentrate sunlight onto a receiver. The energy from the concentrated sunlight heats a high temperature fluid in the receiver.

This heat, also known as thermal energy, can be used to spin a turbine or power an engine, thereby producing electricity. It can also be used in industrial applications such as water desalination, improved oil recovery, food processing, chemical production, and mineral processing.

Utility-scale projects typically employ concentrated solar-thermal power systems. Utility-scale CSP plants can be configured in a variety of ways. Mirrors are arranged around a central tower that serves as the receiver in power tower systems. Linear systems use rows of mirrors to focus sunlight onto parallel tube receivers located above them.

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John charges the rod through friction, then charges the electroscope through induction.

A charging technique called induction charging involves charging a thing without actually contacting it to another charged object.

The charged particle is held close to an uncharged conductive substance that is grounded on a neutrally charged material during the charging by induction process. When a charge is transferred between two objects, an uncharged conductive substance produces an oppositely polarized charge.

The rod is firstly charged by friction with the cotton fabric then John charges the rod through induction, then charges the rod to the electroscope.

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The torque was applied at distance of 14cm from the center of the bolt.

The perpendicular force on the wrench applied is 165N.

The total torque experienced by the bolt is 23.1 N-m.

The torque on any body is given by,

T = Fr

Where,

T is the torque on the body,

F is the force applied in the circular manner for the body,

r is the perpendicular distance of the force applied on the body.

So, now putting the values for the bolt,

23.1 = 165r

r = 0.14m

So, we can conclude here that the force was applied at a distance of 14 cm from the center of the bolt.

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The ratio of the self-inductance of solenoid b to that of solenoid a, is 3.

Self-inductance is the property of the current-carrying coil that resists or opposes the change of current flowing through it. This occurs mainly due to the self-induced emf produced in the coil itself.

Induced emf = N A ( db/dt )

where N is the number of turns in the coil

A is the cross sectional area of the coil

db/dt is the rate of change of the magnetic field

from question we have, Nb = 3Na

Ea = Na x A x (db/dt)       ......(1)

and Eb = Nb x A x (db/dt)       ..........(2)

dividing both equation 1 and equation 2, we get

Eb/Ea  = Nb/Na

Eb/Ea = 3Na/Na

Eb/Ea = 3

Hence The ratio of the self-inductance of solenoid b to that of solenoid a, is 3.

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The energy lost due  to friction and heat is 32784 Joule.

Given parameters:

Mass of the car; M = 120 kg.

speed of the car at bottom; v = 36 m/s.

Height of the hill; h = 94 m.

Then, Gain of  Kinetic energy of the car = 1/2× mass × speed²

= 1/2×120×36² Joule

= 77760 Joule.

Loss of  potential energy of the car = mass× acceleration due to gravity × height

= 120 × 9.8 × 94

= 110544 Joule.

Energy lost due to friction and heat = Loss of  potential energy of the car  - Gain of  Kinetic energy of the car

=  110544 Joule -  77760 Joule.

= 32784 Joule.

Hence,  energy lost due  to friction and heat is 32784 Joule.

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A person feels lighter than his Normal weight when the lift is accelerating downwards.

The price at which an object adjustments its velocity is referred to as acceleration, a vector variable. If an item's velocity is changing, it's miles accelerating. A moving object can every so often adjust its velocity by the same amount every 2nd. a transferring item that adjustments its speed with the aid of 10 m/s per second. since the pace is changing through a set quantity each second,

that is called a regular acceleration. it's miles important to differentiate among an item with a steady acceleration and one with a constant velocity. Be not deceived! An object is accelerating if its speed is changing, whether or not with the aid of a hard and fast amount or a variable quantity. additionally, a transferring item with a regular pace isn't always accelerating.

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Work was done on the train 225x10⁵ J

Power exerted by the train 1.07 x 10⁵ W

Work is the amount of energy transferred to an object when it is moved a certain distance by an external force. Since work is defined as the amount of energy (transferred), it has units of energy, and work usually has units of J (joules). The equation describing the work (W) done on a body moving a distance (s) while a force (F) is acting on it in the same direction as its motion is given by:

W = F × s

Where,

W = work done

F = force applied

s = displacement

We can define force as the rate of work. It is work done in a unit of time. The SI unit for power is the watt (W), which is the joule per second (J/s). The formula for power is:

P = W / t

Where,

P = Power

W = work done

t = time taken

Now for the given question:

W = F × s

F = 5.0x10⁴ N

s =  450.0 meters

W = 5.0x10⁴ x 450.0

W = 225x10⁵J

P = W / t

P = [tex]\frac{225}{210}[/tex] x10⁵

P =1.07 x 10⁵ W

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If the baseball that is thrown with a speed of 20 m / s and bat are in contact for 6.0 m s, the magnitude of the average force delivered to the ball of mass 150 g is 0.5 KN

a = v / t

a = Acceleration

v = Velocity

t = Time

v = 20 m / s

t = 6 m s

t = 6 * [tex]10^{-3}[/tex] s

a = 20 / 6 * [tex]10^{-3}[/tex]

a = 3.3333 * 10³ m / s²

According to Newton's second law of motion,

F = m a

F = Force

m = Mass

m = 150 g

m = 0.15 kg

F = 0.15 * 3.3333 * 10³

F = 0.5 * 10³ N

F = 0.5 KN

Therefore, the magnitude of the average force delivered to the ball is 0.5 KN

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Answer:

2910

Explanation:

970 × 3. 970 in one hour × 3 hrs. 2910 kilometers

Answer: Force = mass x acceleration

Explanation: Here, the plane is standing still so acceleration here is

acceleration due to gravity ( 9.8 m/[tex]s^{2}[/tex])  So,

 Force = mass x 9.8

 230000 = mass x 9.8

 Mass = [tex]\frac{230000}{9.8}[/tex] = 23,469.39 kgs

Here force is negative because it is acting against gravity. Also, since the unit of force is Newton so the unit of mass is in kgs

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Sunburn is caused by UV radiation by damaging DNA, as the following diagram shows:

Visible light and UV radiation differ in wavelength:

Since only Sunscreen A blocks UVA and UVB radiation, then it effectively prevents sunburn.

A container holds a gas consisting of 1.50 moles of oxygen molecules. One in a million of these molecules has lost a single electron. the net charge of the gas will be + 9.033 * [tex]10^{17}[/tex]

If a negative charge is lost by an atom , then due to conservation of charge , that atom will acquire a positive charge . Similarly , if positive charge is lost then that atom  will acquire a negative charge .Now in above question

Total number of moles = 1.5

number of molecules in 1.5 moles of oxygen = 1.5 * 6.022 *[tex]10^{23}[/tex]  = 9.033 *[tex]10^{23}[/tex]  molecules

9.033 *[tex]10^{23}[/tex] / [tex]10^{6}[/tex] million molecules = 9.033 * [tex]10^{17}[/tex] million molecule

1 in a million has lost a single electron

9.033 * [tex]10^{17}[/tex] million molecule will loose 9.033 * [tex]10^{17}[/tex]  electron

the net charge of the gas will be + 9.033 * [tex]10^{17}[/tex]

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The lights on and in your vehicle can be as important to your and your passengers' safety as seatbelts, and as visually appealing as great rims or an unusual paint color.

Automobiles have been around for nearly a decade, almost as long as mass-marketable light bulbs. The first light bulbs were incandescent, which simply passed any current, AC or DC, through a high-impedance filament, which heated up, glowed, and emitted light.

Although their efficiency is low (as low as 10%), they emit light in all directions and are inexpensive. Under the heat required to generate light, the filament material (typically tungsten) evaporates and tends to collect on the inside of the glass bulb, darkening it over time.

Consumers are looking beyond incandescent lights to high intensity discharge headlights and other 12v LED lighting solutions as the automotive industry grows, but there are even more options and modifications available. While there are amazing new technologies available, not all of them are true advancements or even road-legal. Let us shed some light on the situation.

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