Suppose a truck has a momentum of 40,120 kg • meters per second and a mass of 1,180 kg. What is the truck’s velocity?

4.7 × 107 meters per second
47 × 107 meters per second
34meters per second
3.4

Answer:

handle, trigger, spindle

Global warming costs can be very expensive and can have devastating effects on human health and the environment. There is a debate about who should pay for the effects of global warming.

Environmental safety is a crucial issue, and the costs associated with mitigating global warming need to be shared by all parties.

Global warming has led to an increase in disease transmission, property damage, injuries, and deaths, including heat waves. Natural disasters such as hurricanes and floods are also becoming more frequent and intense

. The cost of these disasters is borne by everyone, from individuals to governments, businesses, and non-governmental organizations. In general, the costs of global warming should be distributed across society as a whole rather than being borne by a particular group.

The costs of global warming can be mitigated by increasing the use of renewable energy, reducing carbon emissions, and adapting to the effects of climate change. In conclusion, environmental safety is a shared responsibility, and the costs of global warming should be borne by everyone, not just a specific group.

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Answer:

i think it is B

Explanation:

Answer:

This happens in two ways. If an object is at rest and an unbalanced force pushes or pulls the object, it will move. Unbalanced forces can also change the speed or direction of an object that is already in motion.

Explanation:

The final velocity of the girl after the collision is determined as -4.8 m/s.

The final velocity of the girl is determined from the principle of conservation of linear momentum.

m1u1 + m2u2 = m1v1 + m2v2

50(0) + 80(0) = 50(v1) + 80(3)

0 = 50v1 + 240

50v1 = -240

v1 = -240/50

v1 = -4.8 m/s

Thus, the final velocity of the girl after the collision is determined as -4.8 m/s.

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The electrostatic force between a charge at 13.1 μc points and one at 26.1 μc points is called separation is r = 2.686 m.

Coulomb's law states

The characteristics of the electric force for charges in a resting condition were enumerated by Coulomb as follows: Like charges repel one another whereas opposite charges attract one another. A positive charge will therefore attract a negative charge, while two negative charges will repel one another.

that F = kq1q2r2 ...................................... Formula 1

If r is the distance between the charges, q1 is the first charge, and q2 is the second charge, F is the electrostatic force between the two charges.

Making the variable r the subject of the equation,

r = (kq1q2/F)... Example 2

Assumed: F = 1.77 N, q1 = 13.1 C = 13.106 C, and q2 = 26.1 C = 26.0 106 C

The constant is 9.0109 Nm2/C2, or k.

Equation 2 is changed by substituting r = (9.01092810657.0106/5.05),

r = (14364103/5.05), and

r = (14.364/5.05)

r = √4.844

r = 2.686 m

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The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The thinnest film of magnesium fluoride that can limit the reflection of 550-nm light can be calculated using the concept of thin film interference. The formula for the minimum thickness of the film is given by t = (λ / 4) / (n - 1), where t is the thickness of the film, λ is the wavelength of light, and n is the refractive index of the film material.

In this case, the film is designed to limit the reflection of 550-nm light. Therefore, λ = 550 nm = 5.5 × 10^-7 m. The refractive index of magnesium fluoride is given as 1.38, and the refractive index of glass is 1.52.

Using the formula, the minimum thickness of the magnesium fluoride film can be calculated as follows:

t = (5.5 × 10^-7 m / 4) / (1.38 - 1.52)

  = (1.375 × 10^-7 m) / (-0.14)

  ≈ -9.821 × 10^-7 m

Therefore, the thinnest film of magnesium fluoride that can limit the reflection of 550-nm light is approximately 9.821 × 10^-7 m or 982.1 nm.

The explanation behind this is based on the principles of interference of light waves. When light passes through a thin film, some of the light reflects from the upper surface of the film and some from the lower surface.

These reflected waves can interfere constructively or destructively, depending on the thickness of the film and the wavelength of the light. In the case of destructive interference, the reflected waves cancel each other out, resulting in minimal reflection.

To achieve this, the thickness of the film needs to be such that the reflected waves from both surfaces are exactly out of phase and interfere destructively.

The formula mentioned earlier, t = (λ / 4) / (n - 1), calculates the minimum thickness required for destructive interference. By using the given values of λ (550 nm) and the refractive index of magnesium fluoride (1.38), we can calculate the minimum thickness to be approximately 982.1 nm.

Coating lenses with this thin film of magnesium fluoride helps reduce reflections and improve image clarity in sophisticated cameras, ensuring that the maximum amount of light is transmitted through the lens rather than being reflected away.

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Answer:

B

Explanation:

The radius of the wire is 0.0156 mm.

To calculate the radius of the wire, we need to use the following formula:

Total length of wire = (2 x π x r) x number of turns

where r is the radius of the wire.

Substituting the given values, we have:

Therefore, the radius of the wire is 0.0156 mm.

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Answer:

Explanation:

roles of nutrient in our body​

Answer:

The difference between a piece of ordinary iron and an iron magnet is. The magnetic domains in an iron nail that is brought near a strong magnet. When an ordinary iron nail is removed from a strong magnet

Explanation:

Answer:  Hand span

Explanation: Hand span is not a standard unit.

Second is the unit of time.

Meter is the unit of length or distance covered by an object.

Gram is the unit of weight of an object.

Hand span is not a standard unit. This is because the size of hand varies from person to person. Hence, the correct option is (c) "hand span".

The value of g inside the Earth at half its radius is half of the value of g at the Earth's surface, which is approximately 9.8 m/\(s^{2}\).

If the Earth were of uniform density, we can calculate the value of the acceleration due to gravity (g) inside the Earth at half its radius using the following formula:

g = (4/3) * π * G * ρ * r

Where:

G is the gravitational constant (approximately \(6.67430 * 10^-11 m^3 kg^-1 s^-2)\)

ρ is the density of the Earth

r is the distance from the center of the Earth

Assuming the Earth has a uniform density, the density (ρ) can be calculated by dividing the mass of the Earth (M) by its volume (V):

ρ = M / V

Since we are considering the Earth at half its radius, the distance from the center of the Earth (r) would be equal to half of the Earth's radius (R).

Now, let's calculate the value of g:

First, we need to find the density (ρ):

ρ = M / V

The mass of the Earth (M) and the volume of the Earth (V) can be related using the formula:

M = ρ * V

Substituting ρ * V for M in the density formula:

ρ = (M / V) * V

ρ = M

Since the mass is the same everywhere inside the Earth, the density (ρ) is constant.

Now, let's calculate the value of g at half the radius of the Earth:

g = (4/3) * π * G * ρ * r

Substituting r = R/2:

g = (4/3) * π * G * ρ * (R/2)

Since ρ is constant, we can combine the constant terms:

C = (4/3) * π * G * ρ

g = C * (R/2)

Therefore, the value of g inside the Earth at half its radius is half of the value of g at the Earth's surface, which is approximately 9.8  m/\(s^{2}\).

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Answer:

I think it is A.

Explanation:

If you imagine it on a graph you can picture where it would be and they used the word "northeast" sooo...

Answer:

This Means Nothing to ME

Explanation:

I HAVE A tradition of doing a little analysis on one of my favorite movie franchises to celebrate Star Wars Day (May the Fourth Be With You). Given that Rogue One: A Star Wars Story recently appeared on DVD and various streaming services, I think its OK to look at that film without worrying about spoilers. In this case, I will calculate Darth Vader's power output as he uses the Force.

To calculate the power needed to lift this poor fellow, I can estimate how high Vader lifts him and at what speed. If I guess that the rebel is 1.75 meters tall (the average height of a man here on Earth, so I'll assume the same holds true on whatever planet the rebel calls home) then I can get an approximate scale for the scene. With that, I can use video analysis to plot the vertical position of the rebel as a function of time

Answer:

r = 0.37 m

Explanation:

Use Coulomb's law to solve for r:

F = kq1q2/r^2

---> r^2 = kq1q2/F

= (8.99×10^9)(5.6×10^-4)(-2.1×10^-4)/(-7.7×10^3)

= 0.1373 m^2

or r = 0.37 m

1/9 is its thermal efficiency when the energy input to an engine is 9.00 times greater than the work it performs.

thermal efficiency of the engine=w/q

e= w/q

e=1/9

An internal combustion engine, a steam turbine, or a steam engine's thermal efficiency is measured. The heat is transformed into secondary energy for a heat engine. We can deduce from the first law of thermodynamics that the energy input cannot be greater than the energy output. In a non-ideal process, it cannot be equal according to the second rule of thermodynamics. Thermal efficiency comes in two flavors: brake thermal efficiency and indicated thermal efficiency.

The most crucial aspects of an aircraft engine's performance are its thermal efficiency. The relationship between heat and work establishes their theoretical interchangeability. Consequently, heat is measured in terms of the work unit, such as ft-lb.

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Answer:

Resultant horizontal force = 143 N

Explanation:

Since the a gle is 30° northwest, then it means the resultant force will be horizontal and as such;

Resultant horizontal force = 165 * cos 30

Resultant horizontal force = 142.89

Approximating to a whole number gives;

Resultant horizontal force = 143 N

The height of Science Hall is approximately 14.74 meters.

To determine the height of Science Hall, we can use the principles of kinematics and the equations of motion.

Given that the pebble falls vertically and neglects air resistance, we can consider its motion as free fall under the influence of gravity.

The final velocity of the pebble just before it reaches the ground is 17 m/s.

Using the equation for the final velocity in free fall:

\(v^{2}\) = \(u^{2}\) + 2as,

where v is the final velocity, u is the initial velocity (which is zero since the pebble starts from rest), a is the acceleration due to gravity (approximately 9.8 m/\(s^{2}\)), and s is the distance traveled (the height of Science Hall).

Plugging in the values, we have:

\((17 m/s)^{2}\) = \((0 m/s)^{2}\) + 2 * 9.8 m/\(s^{2}\) * s.

Simplifying the equation:

289 \(m^{2}\)/\(s^{2}\) = 19.6 m/\(s^{2}\) * s.

Solving for s (the height of Science Hall):

s = 289 \(m^{2}\)/\(s^{2}\) / (19.6 m/\(s^{2}\)) = 14.74 m.

Therefore, the height of Science Hall is approximately 14.74 meters.

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Therefore, the average emf induced is N B A / 14ms.  when the plane of the coil is originally perpendicular to the earth's field and is rotated to be parallel to the field in 14 ms.

The question states that a coil's plane is initially perpendicular to the earth's field. When the coil is turned so that it is parallel to the field, an average emf is induced. The objective is to determine the average emf (in volts) that is generated when the plane of the coil is rotated from being perpendicular to being parallel to the field in 14ms.

The coil's flux through the earth's field is calculated using Faraday's law. Faraday's law gives us the following expression;

emf = -N (dФ/dt)

Where, N is the number of turns in the coilФ is the magnetic flux associated with the coil , t is the time interval during which the flux changes.

The coil is perpendicular to the earth's field, which is the external magnetic field.

Therefore, the angle between the plane of the coil and the field lines is 90°, and there is no flux associated with the coil. Hence the emf induced is zero. When the coil is rotated to a parallel position, the angle between the coil plane and the field lines becomes 0°.

The maximum magnetic flux associated with the coil is now

Ф = B A (cos0°),

where B is the earth's magnetic field and A is the area of the coil. T

he average emf is then found by integrating the expression for emf over time, as follows:

∫(emf)dt = ∫ (-N (dФ/dt))dt∫(emf)dt = -N ∫(dФ/dt)dt

The negative sign results because the emf is induced in such a way that it opposes the motion that produced it.

From Faraday's law, we know that as the angle between the plane of the coil and the magnetic field lines changes, the emf induced is

dФ/dt = B A (d/dt)cosθ

where θ is the angle between the plane of the coil and the magnetic field.

Integrating from 0 to 14ms,

we have:

- emf = N B A (cos0° - cos90°) / t

- emf = N B A (1 - 0) / t

- emf = N B A / t= N B A / 14ms

To find the average emf, we need to divide this value by the time interval over which the coil rotates.

Therefore, average emf = emf / 14ms

average emf = N B A / 14ms

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Answer:

The property of the wave marked X is related to the source of the wave

Explanation:

The source of of origin of waves

Electromagnetic wave are waves that consists of varying electric and magnetic field that vibrate perpendicular to each other and to the direction of propagation of the wave and they are therefore transverse waves and transfer energy

Electromagnetic waves originate from the vibration of charged particles that gives off varying electric and magnetic fields

Mechanical waves are defined as waves that require a material medium such as air, water, metal, plastic, stretched leather, or wood to propagate

Mechanical waves originate from vibration of the particles of a medium

Sound waves which is a form of longitudinal mechanical waves that propagates by the vibration of the particles of a given medium about a point parallel to the direction of propagation of the wave.

Answer:

Induced magnetism

Explanation:

Answer:

induced magnetism

Explanation:

Placing a piece of metal such as an iron bar into a magnetic field, thereby causing the bar to become magnetized, is known as induced magnetism. Typically, an object that has been magnetized in this manner will lose its magnetic properties quickly when removed from the magnetic field.

(a) Both spheres are launched with 0 initial velocity in the vertical direction, so they both hit the ground at time t such that

10 m - 1/2 g t ² = 0

where g = 9.80 m/s² is the magnitude of the acceleration due to gravity.

Solve for t :

10 m = 1/2 g t ²

t ² = (20 m) / g

t ≈ 1.4 s

(b) Sphere A travels a horizontal distance of

(5.0 m/s) (1.4 s) ≈ 7.1 m

while sphere B travels a distance of

(2.5 m/s) (1.4 s) ≈ 3.6 m

Answer:

D

Explanation:

First we define our variables

V0=29.4

a=-9.8

V=0

We have to find the maximum displacement , which I will define as X

We use formula v^2=v0^2+2aX

All we do is substitute our values

0=29.4^2-19.6X

29.4^2=19.6X

X=29.4^2/19.6=44.1

Answer:

Change in velocity and direction over a specific period of time.

Explanation:

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate the acceleration of an object.

Mathematically, acceleration is given by the equation;

\(Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}\)

\(a = \frac{v - u}{t}\)

Where,

a is acceleration measured in \(ms^{-2}\)

v and u is final and initial velocity respectively, measured in \(ms^{-1}\)

t is time measured in seconds.

Hence, the types of changes in motion that cause acceleration is a change in velocity and direction over a specific period of time.

9.19m

the altitude of the triangle in the figure below. 50˚ and 12 m

As per figure,

AD is the altitude of the triangle

also AD is perpendicular to BC

so TRIANGLE ABD is a right angled triangle

sin50° = AD/AB = AD/12

AD = 12sin50°

AD = 9.19m

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Ranking of the given substances based on increasing force of attraction between its submicroscopic particles is, (c) air, (a) sugar, (b) water.

Air is composed of mostly nonpolar molecules, which have weak intermolecular forces. Sugar, on the other hand, is composed of polar molecules that have stronger intermolecular forces compared to air. Water has the strongest intermolecular forces of the three because of its polar nature and ability to form hydrogen bonds. Therefore, the order of increasing force of attraction between the submicroscopic particles of these substances is air < sugar < water.

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The formation of daughter nuclei from the parent by using the number of half-lives is taking the ratio of the number of half-lives and the original amount present in the nuclei.

From the given, the half-life is defined as the time taken by the radioactive material to decay one-half of its initial value.

For the second row, the half-life is 1 and the daughter nuclei are 1/2, hence the original isotope remaining is  1/2. The ratio of parent and daughter nuclei is 1:1.

In the third row, the half-life is 2 and the remaining parent nuclei are 1/4 and the daughter nuclei is 3/4 and the ratio of parent and daughter nuclei is 1:3.

In the fourth row, the half-life is 3 and the remaining parent nuclei is 1/8 and the daughter nuclei are 7/8. The ratio of parent and daughter nuclei is 1/8:7/8 and the time taken is 20 days.

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Answer:

A) The ball will roll forever in a straight path.