a steel bridge is 150 m long when the temperature is -20c . by how much will its length increase when the temperature is 38f ?

The statement that is incorrect about scientific laws is "Laws describe a definite pattern in nature".

Scientific laws are statements, which predicts or describes a range of phenomena. A scientific law id described based on repeated experiments and observations.

As the definition describes, law predicts what might happen in a situation. So statement 1 is correct. If a law is not applicable, then the knowledge based on that law will collapse. So statement 2 is correct. Laws are descriptions of science that is made clear using mathematical equations. So statement 3 is correct.

Therefore,  "Laws describe a definite pattern in nature" is an incorrect statement.

To know more about scientific laws

https://brainly.com/question/15189105

#SPJ1

If a mountain goat starts a rock slide and the rocks crash down the slope 100 m. If the rocks reach the bottom in 5 s, then the acceleration of the rock would be 8 meters/second².

The rate of change of the velocity with respect to time is known as the acceleration of the object.

As given in the problem a mountain goat starts a rock slide and the rocks crash down the slope 100 m. If the rocks reach the bottom in 5 s,

initial velocity of rock = 0 m/s

displacement = 100 meters

time = 5 seconds

s = ut + 0.5at²

100 = 0 + 12.5a

a = 100/12.5

  = 8 meters/second²

Thus, the acceleration of the rock would be 8 meters/second².

To learn more about acceleration from here, refer to the link;

brainly.com/question/2303856

#SPJ1

Answer:

Pedal / Front Gear = 18 / 9 = 2

Front Gear /Rear Gear = 9 / 4 = 2 1/4

Rear Gear / Wheel = 4 / 33 = .121

2 * 2 1/4 * .121 = ,55

C) Seems true

Answer:

for this, I would say D

Explanation:

Because instead of deciding what the ethics themselves are, you should set the ethics and create a system that can act on those ethics themselves.

Please give brainliest, have a great night!

Answer

Clinometers measure both inclines and declines using three different units of measure: degrees, percentage points, and topo . Astrolabe is example of an inclinometer that was used for celestial navigation and location of astronomical objects from ancient times to the Renaissance.

Answer:

Faster

Explanation:

Answer:

The force of friction acting on the block has a magnitude of 15 N and acts opposite to the applied force.

Explanation:

Net Force

The Second Newton's law states that an object acquires acceleration when an unbalanced net force is applied to it.

The acceleration is proportional to the net force and inversely proportional to the mass of the object.

If the object has zero net force, it won't get accelerated and its velocity will remain constant.

The m=2 kg block is being pulled across a horizontal surface by a force of F=15 N and we are told the block moves at a constant velocity. This means the acceleration is zero and therefore the net force is also zero.

Since there is an external force applied to the box, it must have been balanced by the force of friction, thus the force of friction has the same magnitude acting opposite to the applied force.

The force of friction acting on the block has a magnitude of 15 N opposite to the applied force.

The deceleration experienced by the 1075 N sky diver as he opened his parachute is 13.39 m/s²

Force = mass × acceleration

We know that deceleration is the acceleration of stopping objects. Thus,

Force (F) = mass (m) × deceleration (a)

Thus, we can obtain the deceleration of the sky diver as follow:

Force = mass (m) × deceleration (a)

1469 = 109.69 × a

Divide both sides by 109.69

a = 1469 / 109.69

a = 13.39 m/s²

Thus, the deceleration is 13.39 m/s²

Learn more about deceleration:

https://brainly.com/question/28598392

#SPJ1

The refrigerant undergoes this process with a rise in volume and enthalpy but no change in pressure or temperature.

A thermodynamic cycle called the refrigeration cycle is used to remove heat from a particular location that you want to chill.

Learn more about refrigeration here:

https://brainly.com/question/13002119

#SPJ4

Answer:

The extension of the spring is 7.35 cm

Explanation:

Spring Force

When a spring is compressed or extended by a distance x, it exerts a force given by the Hooke's Law:

F=k.x

Where k is the constant of the spring.

A mass of m=75 gr is hung to the spring of constant k=10 N/m. The force applied to the spring is the weight of the mass:

W = mg

The mass must be converted to kg:

m = 75/1000 = 0.075 kg

W=0.075*9.8

W = 0.735 N

The extension of the spring can be computed by solving for x:

\(\displaystyle x=\frac{0.735}{10}\)

x=0.0735 m

x = 7.35 cm

The extension of the spring is 7.35 cm

Answer:

4J

Explanation:

Hooke's Law states:

F = -kx

where F = force

k = spring constant

x = displacement of spring

20 = -(50)x

-20/50 = x = -2/5

We can now use this information to find the energy in the Elastic Potential Energy Formula which is...

1/2(k)(x)^2

1/2(50)(2/5)^2 = 4J

Given:

By using the Hooke's law states,

→ \(F = -kx\)

By substituting the values, we get

→ \(20= -(50) x\)

    \(x = -\frac{20}{50}\)

       \(= -\frac{2}{5}\)

hence,

The energy will be:

= \(\frac{1}{2} kx^2\)

By putting the values,

= \(\frac{1}{2}\times 50\times (\frac{2}{5} )^2\)

= \(4 \ J\)

Thus the above answer is right.    

Learn more about force here:

https://brainly.com/question/14670501

Answer:

weight. The force with which an object near the Earth or another celestial body is attracted toward the center of the body by gravity. An object's weight depends on its mass and the strength of the gravitational pull.

Explanation:

This may be right i'm not 100%

Answer:

1) wave length

2) parallel reflection

The Hall effect refers to the phenomenon in which a voltage is generated across a conductor transverse to an applied magnetic field and current flow. the Hall effect and its associated equations is crucial in many electrical and electronic applications.

The Hall voltage is directly proportional to the magnetic field strength and the magnitude of the current flow. It is also affected by the electron density and charge of the conductor material. Mathematically, the expression for Hall voltage (VH) can be given as VH = (IB / Nea) * B where IB is the current flow, ne is the electron density of the conductor material, A is the cross-sectional area of the conductor, and B is the applied magnetic field. The expression shows that the Hall voltage is directly proportional to the product of current flow and magnetic field strength. However, it is inversely proportional to the electron density and the cross-sectional area of the conductor. In summary, the Hall voltage can be expressed in terms of current, magnetic field, electron density, charge, and area of the conductor using the above mathematical equation. Understanding the Hall effect and its associated equations is crucial in many electrical and electronic applications.

learn more about magnetic here.

https://brainly.com/question/3617233

#SPJ11

A given peak on the wave travels 60.75 cm in a time interval of 0.50 s.

Given:

Frequency of wave, `f = 4.5 Hz`

Amplitude of wave, `A = 12 cm`

Wavelength of wave, `λ = 27 cm`

Time interval, `t = 0.50 s`

We have the formula for the wave as follows: `y(x, t) = A sin(2π(ft - x/λ))`, where `y(x,t)` is the displacement of the string from its rest position at a given point `x` and time `t`.

So, we know that the wave is traveling in the horizontal direction, so the displacement of the string will be perpendicular to the direction of the wave.

Therefore, we can calculate the distance traveled by the peak using the speed of the wave and the time interval. We can find the speed of the wave using the formula: `v = fλ`, where `v` is the speed of the wave.

Putting the values in the above formula, we get: `v = 4.5 × 27 = 121.5 cm/s`

So, the distance traveled by the peak in the given time interval can be found as:

Distance = speed × time = 121.5 × 0.5 = 60.75 cm.

In summary, the distance traveled by the peak of the wave in the given time interval is 60.75 cm.

Learn more about wave here :-

https://brainly.com/question/27511773

#SPJ11

The force of gravity increases when two objects move closer together. This is true statement.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

A spring balance can be used to calculate the Force. Newton is the SI unit of force.

The force of gravity between two objects is inversely proportional to the square of the distance between them. Hence, the force of gravity increases when two objects move closer together. This is true statement.

Learn more about force here:

https://brainly.com/question/13191643?

#SPJ2

The PEP/9 Assembly language equivalent of the given hexadecimal instructions is as follows:

DECI 3, d

DECO 49, i

DECL 1, i

DECL 49, i

In PEP/9 Assembly language, instructions are written using mnemonics that represent specific operations. The first instruction, "DECI 0×0003, d," is equivalent to "DECI 3, d" in assembly language. It performs a decimal input operation, storing the value in memory location 'd'.

The second instruction, "DECO Ox0031, i," translates to "DECO 49, i" and outputs the decimal value 49 from memory location 'i'. The last two instructions, "DECL 0x0001, i" and "DECL 0x0031, i," are simply represented as "DECL 1, i" and "DECL 49, i" in assembly language, respectively. These instructions decrement the values in memory locations 'i' by 1.

By providing the assembly language equivalents, it becomes easier to understand and work with the given hexadecimal instructions in the PEP/9 architecture.

learn more about "Assembly language":- https://brainly.com/question/30299633

#SPJ11

Answer:

D all of these

Explanation:

Extrinsic statements originate in parents ,society and teachers. Option D is correct.

Extrinsic motivation is defined as conduct motivated by external incentives. Extrinsically driven people will continue to do something even if it isn't pleasurable or rewarding in and of itself.

These incentives might be monetary or intangible in nature, such as acclaim or renown. Extrinsic motivation is distinct from intrinsic motivation in that it is only motivated by external incentives.

Extrinsic statements originate in;

a. Parents

b. Society

c. Teachers.

Extrinsic statements originate in all of the above given option.

Hence, option D is correct.

To learn more about the extrinsic motivation, refer to the link;

https://brainly.com/question/1658150

#SPJ2

The correct statements of an electric field are: (a) Its electric potential energy increases as it goes from high to low potential. (d) Its kinetic energy decreases as it moves in the direction of the electric field.

(a) When an electron moves from a region of high electric potential to a region of low electric potential, its electric potential energy increases. This is because the electron experiences a change in potential energy due to the electric field. Moving in the direction of the electric field, the electron gains potential energy. (d) As the electron moves in the direction of the electric field, its kinetic energy decreases. This is because the electric field does work on the electron, converting its kinetic energy into potential energy. The electron loses kinetic energy as it accelerates in the direction of the field. (c) and (e) are incorrect statements. The potential energy and kinetic energy of the electron are not directly related in this context. While the electron's potential energy may change, its kinetic energy does not necessarily follow a predictable pattern solely based on the direction of the electric field.

To learn more about kinetic energy

https://brainly.com/question/8101588

#SPJ11

If 60 Joules of energy are applied to the bricks, so   the lever’s efficiency is 60%.

Efficiency is a measure of how well a machine or system transforms input energy into useful output energy. It is a ratio of output energy to input energy. In this case, the team of students builds a lever as a science project. They expend 100 Joules of energy to lift some bricks with the lever. If 60 Joules of energy are applied to the bricks, what is the lever’s efficiency? In this case, we have;

Total input energy, I = 100 J

Total output energy, O = 60 JEfficiency, η = Output energy/Input energyη = O/II = O/ηη = O/I = 60/100 = 0.6

or 60%Therefore, the efficiency of the lever is 60%.

This implies that the lever converts 60% of the input energy to useful output energy. That is, it requires 100 J of input energy to lift the bricks, but only 60 J of energy is applied to the bricks. The remaining 40 J is lost due to friction, air resistance, or other forms of energy dissipation.

For more question  lever’s efficiency

https://brainly.com/question/20379613

#SPJ8

Answer:

∆y=30m

Vi=10m/s

a=9.8

Vf=?

(1)Vf²=Vi²+2a∆y

Vf²=(10)²+2(9.8)(30)

Vf²=100+588

Vf²=688

√Vf²=√688

Vf= 26,23

(2) Vf=Vi+a∆t

26,23=10+9,8∆t

16,23=9,8∆t

∆t=1,66 sec

Field forces, such as gravitational, electric, and magnetic ones, can have an impact on a wide variety of objects and act over great distances.

Gravitation, electromagnetic forces, the strong and weak forces found in atoms, and these four types of field forces are all present in the universe. The universe's four most fundamental forces are these four.

Due to the fact that gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, greater separation distance will result in weaker gravitational forces. The gravitational attraction between two objects therefore weakens as they are moved apart from one another.

To know more about field forces visit:

https://brainly.com/question/13488023

#SPJ4

Explanation:

Hey there!

Given;

Mass of the Earth (M) = 6.0*10^24kg.

Radius of Earth (R) = 6400km = 6400*1000= 6.4*10^6.

Gravitational constant (G) = 6.67*10^-11Nm^2/kg^2.

Height from surface of Earth (h) = 350km= 3.5*10^5m

Gravity (g) = ?

We have;

\(g = \frac{G.M}{ {(R + h)}^{2} } \)

Where "G" is gravitational constant, "M" is mass of earth, "g" is acceleration due to gravity, "h" height from surface of Earth.

Keep all values.

\(g = \frac{6.67 \times {10}^{ - 11} \times 6.0 \times {10}^{24} }{ (6.4 \times {10}^{6} + 3.5 \times {10}^{5} )^2} \)

\(or \: g = \frac{40.002\times {10}^{13} }{ (6.4\times {10}^{6} + 3.5*10^5)^2} \)

g = 8.7m/s^2

Therefore, gravity from distance 350km above the Earth's surface is 8.7m/s^2.

Hope it helps...

Answer:

July

Explanation:

In july you would expect least hurricane

The nuclear fission reaction of Uranium-235 atom produces Barium-141, Krypton-92 and 3 neutrons.

Nuclear fission is a nuclear reaction in which the atomic nucleus of a heavier element disintegrates or splits to produce two or more atoms of elements with smaller nuclei.

The nuclear fission reaction in which a neutron is used to bombard the nucleus of Uranium-235 atom to produce Barium-141, Krypton-92 and 3 neutrons is given below

\(_{235}U + \: _{1}n^{o} \rightarrow \: _{141}Ba+ \: _{92}Kr + 3 \: _{1}n^{o} \)

Therefore, the nuclear fission reaction of Uranium-235 atom produces Barium-141, Krypton-92 and 3 neutrons.

Learn more about nuclear fission at: https://brainly.com/question/3992688

#SPJ1

Yes, she will be able to retrieve the item

An echo is the repetition of sound formed due to the reflection of the sound wave.

From the question, we are given the following;

Speed of sound through water v = 530m/s

The time it takes the echo to reach the sonar detector t = 6.2s

First, we need to know how far the echo can travel using the formula;

2x = vt

x is the distance from the source of the sound to the reflector

v is the speed of sound

t is the time

Substituting the given values into the formula:

\(x=\frac{vt}{2}\\x=\frac{530*6.2}{2} \\x=530*3.1\\x= 1643m\)

Since the research historian knows that her equipment is only good enough to recover items that are at a depth of 5 000 m or less and 1643m is less than 5000m, hence she will be able to retrieve the item.

Learn more about echo here: https://brainly.com/question/23127522

The research historian can retrieve the item.

Sound is a form of mechanical waves, which is a kind of waves that needs a medium to propagate itself and whose kinematic is representative of motion at constant speed. The maximum echo time (\(t_{e}\)), in seconds, is the distance travelled by waves (\(s\)), in meters, divided by velocity of sound through the medium (\(v_{s}\)), in meters per second:

\(t_{e} = \frac{s}{v_{s}}\) (1)

Please notice that distance travelled by sound is twice the depth of the sunken object.

If we know that \(s = 10000\,m\) and \(v_{s} = 1530\,\frac{m}{s}\), then the maximum echo time is:

\(t_{e} = \frac{10000\,m}{1530\,\frac{m}{s} }\)

\(t_{e} = 6.535\,s\)

Any sunken object whose echo time is less than 6.535 seconds can be retrieved. As the echo time related to the item was 6.2 seconds, the research historian can be able to retrieve the object.

The boundary of Class C airspace is depicted on a Sectional Aeronautical Chart by a solid Magenta line.

Like nautical charts do for boats or a roadmap does for cars, an aeronautical chart is a map made specifically to aid in the navigation of aeroplanes.

Pilots may find their position, a safe altitude, the best path to their destination, navigational aids all along way, alternate landing zones in case of an emergency while in flight, and other helpful information like radio frequencies & airspace limits using these charts as well as other tools.

There are long-distance maps for transoceanic travel as well as charts for all land masses on Earth. Each phase of flight requires a specific chart, which can range from a map of a specific airport facility to a summary of the instrument routes spanning a whole continent (such as global navigation charts), & so many different sorts in between.

To know more about Aeronautical Chart:

brainly.com/question/14371982

#SPJ11

Answer:

OC, The Tariff of Abominations caused conflicts between the North and the South regarding their sectional interests.

Explanation:

The Tariff of Abominations did cause conflicts because it widened income inequality since it favored the rich upper class while burdening the lower class. The South was the lower class, and the North was more of the upper class.

Answer:

Valence electrons are electrons that tend to stay in the highest energy levels of an atom and are involved in chemical bonding.

Answer:Valence electrons are outer shell electrons with an atom and can participate in the formation of chemical bonds. In single covalent bonds, typically both atoms in the bond contribute one valence electron in order to form a shared pair. ... Most atoms do not have eight electrons in their valence electron shell.

Explanation:

hope i helped u have a great day