If a beam of light travels through a piece of glass at 90,000 miles per second, the refractive index of the glass is

Magnetism is using a reference point to help her in her measurements.

The force that magnets use to either attract or repel one another is known as magnetism.

The force that magnets use to either attract or repel one another is known as magnetism. Electric charges in motion are the source of magnetism.

Atoms, the smallest building blocks of matter, make up every substance. There are electrons in every atom, which are charged particles. The electrons that make up an atom's nucleus, or core, spin like tops.

Therefore, Magnetism is using a reference point to help her in her measurements.

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Answer:

  Air Resistance is negligible

Explanation:

If they hope to see that energy is conserved, then energy must not be gained or lost during the experiment. That is, loss due to air resistance must be negligible.

Answer:

air resistance negligible=true

Explanation:

We used the Biot-Savart law. So the magnetic field at point C is [-1.64×10^-10 T, 0, -1.82×10^-10 T] Tesla.

To calculate the magnetic field at a given point due to a moving charge, we can use the Biot-Savart law:

B = (μ0/4π) * (q * v x r) / r^3

where B is the magnetic field, μ0 is the permeability of free space, q is the charge of the particle, v is the velocity of the particle, r is the position vector from the particle to the point where we want to calculate the magnetic field, and x denotes the vector cross product.

For part A, the position vector r = (0.02 m, 0 m, 0 m), and the velocity vector v = (0 m/s, 0 m/s, 3.8×10^7 m/s). The charge of an electron is -1.6×10^-19 C. Plugging these values into the formula, we get:

B = (4π×10^-7 T·m/A) * (-1.6×10^-19 C * [0, 0, 3.8×10^7 m/s] x [0.02, 0, 0]) / (0.02^3 m^3)

B ≈ [1.22×10^-5 T, 0, 0]

So the magnetic field at point A is [1.22×10^-5 T, 0, 0] Tesla.

For part B, the position vector r = (0 m, 0 m, 0.01 m), and the velocity vector v = (0 m/s, 0 m/s, 3.8×10^7 m/s). Plugging these values into the formula, we get:

B = (4π×10^-7 T·m/A) * (-1.6×10^-19 C * [0, 0, 3.8×10^7 m/s] x [0, 0, 0.01]) / (0.01^3 m^3)

B ≈ [0, -6.08×10^-11 T, 0]

So the magnetic field at point B is [0, -6.08×10^-11 T, 0] Tesla.

For part C, the position vector r = (0 m, 0.02 m, 0.01 m), and the velocity vector v = (0 m/s, 3.8×10^7 m/s, 0 m/s). Plugging these values into the formula, we get:

B = (4π×10^-7 T·m/A) * (-1.6×10^-19 C * [0, 3.8×10^7 m/s, 0] x [0, 0.02, 0.01]) / (0.022^3 m^3)

B ≈ [-1.64×10^-10 T, 0, -1.82×10^-10 T]

So the magnetic field at point C is [-1.64×10^-10 T, 0, -1.82×10^-10 T] Tesla.

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The thing which would happen if the weight of people increased on a roller coaster is that it will make it harder for it to slow down.

This is referred to as the force acting on the object due to gravity and it is denoted as W= mg where m is mass and g is acceleration due to gravity.

We should note that the larger the mass, the larger the momentum, and the more force you need to change it. Weight however does not make a roller coaster go faster but it does make it harder to slow down which is therefore the reason why it was chosen as the correct choice.

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Answer:

1). Brake pedal or lever

2). A pushrod also called an actuating rod

To express the tension T in the cable as a vector using the unit vectors i and j, we can break down the tension into its components in the x-direction and y-direction. T as a vector is T = T_x * i + T_y * j

Given:
a = 10.4 m (distance from point C)
b = 4 m
c = 7.7 m
T = 8.1 kN (magnitude of tension)

To find the x-component of T, we can use the cosine rule:
T_x = T * cosθ

Using the triangle formed by the load, point C, and the vertical line from point C, we can calculate the angle θ:
cosθ = b / c
θ = cos⁻¹(b / c)

Substituting the given values:
θ = cos⁻¹(4 / 7.7)

Next, we can calculate the y-component of T using the sine rule:
T_y = T * sinθ

Substituting the given values:
T_y = 8.1 kN * sin(θ)

Finally, we can express T as a vector using the unit vectors i and j:
T = T_x * i + T_y * j

To summarize:
1. Calculate θ using the cosine rule:

θ = cos⁻¹(b / c)
2. Calculate the x-component of T:

T_x = T * cosθ
3. Calculate the y-component of T:

T_y = T * sinθ
4. Express T as a vector:

T = T_x * i + T_y * j

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Answer:

I believe the answer is transformation

Explanation:

Respuesta: T2 = 131.04K

Explicación: Dado lo siguiente:

Presión, P1 = 1.5 atm = 1.5 × 760 = 1140 mmHg

Presión, P2 = 1.2 atm = 1.2 × 760 = 912 mmHg

Volumen, V1 = 500cm3 Volumen, V2 = 300cm3

Temperatura, T1 = 273K Temperatura, T2 =?

Usando la fórmula de gas combinada:

P1V1 / T1 = P2V2 / T2

Ingresando nuestros valores:

(1140 × 500) / 273 = (912 × 300) / T2

T2 × (1140 × 500) = 912 × 300 × 273

T2 = 74692800/570000 T2 = 131.04K

Answer:

Resultant horizontal force  :  16 N

Resultant vertical force :   4 N

Explanation: Force acting on left : 3N

                      Force acting on left : 1 N

                      Forces acting on left : 3N + 1N = 4N

                       Force acting on right : 12 N

                       Resultant horizontal force  : 12 N - 4 N = 16 N

                      Force acting upwards : 4 N

                      Force acting upwards : 2 N

                      Forces acting upwards : 4 N + 2 N = 6 N

                       Force acting downwards : 10 N

                        Resultant vertical force : 10 N - 6N = 4 N

Answer:

166 meters. Displacement is the movement of something from one place/position to another. Unless the type of displacement you're talking about is “the occupation by a SUBMERGED body or part of a body of a volume which would not otherwise be occupied by a fluid”.

Explanation:

33 + 71 + 62 = 166

The distance you traveled does not depend upon where, is about how much.

The vehicle has an acceleration of 5 m/s² -  A motorbike, when its speed changes from rest to 50 m/s in 10s

What is an acceleration ?

Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates. Even if the speed is constant, motion on a circle accelerates because the direction is always shifting. Both effects contribute to the acceleration for all other motions.

Acceleration is a vector quantity since it has both a magnitude and a direction. A vector quantity is also velocity. The velocity vector change during a time interval divided by the time interval is the definition of acceleration.

All the vehicles have an initial velocity ( u) = 0
A- For bicycle
Final velocity (v) = 2.5m/s    time (t) = 2s
acceleration = 2.5/2 = 1.25m/s2

B- For car
Final velocity (v) = 15m/s    time (t) = 5s
acceleration = 15/5 = 3m/s2

C- For lorry
Final velocity (v) = 20m/s    time (t) = 15s
acceleration = 20/15= 1.33m/s2

D- For motorbike
Final velocity (v) = 50m/s    time (t) = 10s
acceleration = 50/10= 5m/s2

Option D is the correct answer as the motorbike will have an acceleration of 5m/s2.
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3rd and 6th row in second table do not agrees with the equation ( Force = mass * acceleration ) , rest follows the equation

There is a relation between force , mass and acceleration of the body , in a such a way that it agrees with newton's third law which is  Force = mass * acceleration

All the given data in the table follows this relation except where

mass = 150 kg

a = 0.67 \(m/s^{2}\)

F (given ) = 100 N

calculated force = ma = 150 * 0.67 =  100.5 N

mass = 300 kg

force (given) = 100 N

a = 0.33 \(m/s^{2}\)

calculated force = ma = 300 * 0.33 = 99 N

rest of the data completely follow the equation F = ma

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Answer:

I think its A

Explanation:

Not 100 percent sure tho but they do go up and down in big movements.

The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be expressed in terms of Th, Tc  and ρc (density of surrounding air) using the ideal gas law as follows: ρh = (ρc * Tc) / Th

The ideal gas law states that for a given amount of gas, the product of its pressure (P) and volume (V) is proportional to the product of its temperature (T) and the number of moles (n). Mathematically, it can be expressed as:

PV = nRT

Where R is the ideal gas constant.

Since we are considering a balloon filled with hot air, the pressure and volume inside the balloon remain constant. Therefore, we can modify the ideal gas law to relate the densities of hot air (ρh) and surrounding air (ρc) to their respective temperatures:

(ρh * V) / Th = (ρc * V) / Tc

Here, V represents the volume of the balloon, which cancels out on both sides of the equation.

Simplifying the equation:

ρh / Th = ρc / Tc

Rearranging the equation to solve for ρh:

ρh = (ρc * Tc) / Th

The density (ρh) of hot air inside the balloon, assuming it is uniform throughout, can be calculated using the ideal gas law. The expression for ρh in terms of Th (temperature of hot air), Tc (temperature of surrounding air), and ρc (density of surrounding air) is given as: ρh = (ρc * Tc) / Th.

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First convert from mi/h to ft/s. There are 5280 ft to 1 mi, and 3600 s to 1 h, so

36 mi/h = (36 mi/h) * (5280 ft/mi) * (1/3600 h/s) = 52.8 ft/s

Let a be the acceleration of the car. The car's speed at time t is

v = 52.8 ft/s + a t

so that after 5.4 s, it attains a speed of

v = 52.8 ft/s + (5.4 s) a

Recall that

v² - u² = 2 a ∆x

where u is the car's initial velocity and ∆x is the distance it's traveled.

We have

(52.8 ft/s + (5.4 s) a)² - (52.8 ft/s)² = 2 a (595 ft)

Omitting units, this equation reduces to

(52.8 + 5.4 a)² - 52.8² = 1190 a

==>  29.16 a² - 619.76 a = 0

==>  29.16 a - 619.76 = 0

==>  29.16 a = 619.76

==>  a ≈ 21.25 ft/s²

Answer:

B.

Goals are scored by kicking the ball through goalposts.

Explanation:

Answer:

All investigations share steps of the scientific method, such as asking a question, conducting research, or analyzing data. The differences between investigations are usually related to what's being examined and the order of the steps followed.

In a criminal investigation, facts are collected about a crime that has already happened. While there are individual tests that can be done on certain types of evidence, there isn't an experiment to test every part of a crime. It can also be difficult to control all factors in a crime scene in order to test one variable at a time. Usually, there are so many variables and missing facts in a crime that a hypothesis and conclusion are hard to determine.

Explanation:

hope it helps <3

All types of investigation involve the steps of the scientific method, such as asking questions, researching, analyzing data, etc.

The research methods and techniques that can be used in order to develop hypotheses, conduct experiments, analyze data, and draw conclusions are called scientific investigations.

The evidence does not give enough solutions but it can lead to new issues for investigation. The methods that can be used by scientists to do scientific investigations involve scientific methods. The steps utilized by scientists to conduct the scientific investigation include:

Scientific investigation starts with an observation. After observing unusual we commonly question ourselves.

A hypothesis can be described as the possible answer to any scientific question. The hypothesis is logical still it can be falsifiable. The results of the test whether the evidence agrees with the prediction and supports the hypothesis or not to create a conclusion.

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The water bath shouldn't grow too hot because a gain in temperature directly corresponds to a rise in pressure. (Volume remains constant)

ethyl alcohol - Think of the word EtOH. This phrase, which is used as a synonym for alcoholic beverages, comes from the chemical shorthand for ethyl alcohol.

Alcohol made from ethanol is referred to as ETOH. Alcohol is a family of several chemical substances that includes ethanol alcohol, often known as ethyl alcohol, grain alcohol, or simply alcohol. In addition to being a solvent, ETOH can be produced to make other compounds or added to gasoline.

Common medications like ranitidine, furosemide, mannitol, phenobarbital, co-trimoxazole, and paracetamol are known to contain ethanol in their formulations in the European Union (EU).

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P1=P2=P3  is true about the pressure on the bottom in each container.

P=F/A

same area and same force lead to same pressure.

Pressure is defined as force/area. To calculate the pressure that snow exerts on a roof, divide the weight of the snow by the roof's surface area. Gases are a typical pressure source in physics. A "vacuum" is used to describe the absence of pressure. People have long held the belief that vacuums are improbably rare and unnatural because "nature abhors a vacuum." Actually, this is not the case.

The number of pressure units is ridiculous. The units torr or mmHg are frequently employed. The only subject of conversation is the height of a mercury column. The atmosphere contains 760 torr, or mmHg. You could also look at mmH2O, which makes use of a related idea.

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Answer:

When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate

Explanation:

Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force

Newton's second law states that an applied force is equal to the rate of change of momentum it produces

Newton's third law states action and reaction are equal and opposite.

(a) The charge of the ion is determined as 2.76 x 10⁻¹³C.

(b) The potential difference between the oil droplet’s starting point and end point is 16.28 V.

The charge of the ion is calculated as follows;

W = Fdsinθ

F = W/dsinθ

F = (3.9 × 10⁻¹²)/(0.022 x sin120)

F = 2.046 x 10⁻¹⁰ N

E = F/q

q = F/E

q = (2.046 x 10⁻¹⁰)/(740)

q = 2.76 x 10⁻¹³C

E = V/d

V = Ed

V = 740 x 0.022

V = 16.28 V

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The 20-amp circuit breaker may not remain operational if the 910-watt waffle iron, 895-watt toaster, and 691-watt coffeemaker are all running at the same time.

In circuit breaker:

The total power consumption of these appliances exceeds the maximum power that the circuit breaker can handle, which is 20 amps multiplied by 120 volts, or 2,400 watts.

To determine the total power consumption of the appliances, we can add up their individual power ratings:

910 watts (waffle iron) + 895 watts (toaster) + 691 watts (coffeemaker) = 2,496 watts

This is greater than the maximum power that the circuit breaker can handle, so if all three appliances are running simultaneously, the circuit breaker will trip, causing a power outage.

To avoid this situation, you can stagger the use of the appliances or plug them into different outlets on different circuits.

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1800 sec = 30 min

Hi there !

18km = 18×1000m = 18000 m

1 s ............... 10m

x s ...............18000m

x = 1×18000/10 = 1800 sec = 30 min

Good luck !

If a student took seven science classes, his/her at score would be 1200.

A graph is a relationship in which data is presented on the axes of cartesian coordinates. The presentation of the graph must be such that it is easy to read off the graph.

Now we can see that the graph is a plot of SAT scores versus the number of science classes that students take. In this case, the slope would tell us the score per subject of a student in the SAT.

a) The mathematical model that re[resents this graph is;

y =100x + 500

b) The slope of the graph must be obtained by the use of two points thus;

m = y2 - y1/x2 - x1

m = 600 - 500/1 - 0

m = 100

c) Using the relation;

y = mx + c

m = 100

c = 500

y = 100(7) + 500

y = 1200

Thus if a student took seven science classes, his/her at score would be 1200.

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