The refractive index is typically determined in a vacuum medium.
In what kind of medium is the refractive index normally calculated?A refractometer is the tool used to measure refractive index (RI). A refractometer is frequently used to determine the refractive index of liquid samples. It does this by measuring how much light is bent when it enters the sample from the air.
How do forensic scientists use refractive index?In forensic laboratories, measuring refractive index is a common way to look into glass microtraces. The technique's cost-effectiveness and reproducibility are advantages, but it also works well for analyzing minute fragments.
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A ball rolled toward Manny while he was playing soccer. If Manny’s foot kicks the ball as shown in the picture, which will most likely happen to the ball?
answer choices
- The ball will stop rolling.
- The ball will roll toward the east.
- The ball will continue rolling west.
- The ball will go straight up in the air.
Answer:
no photo
Explanation:
sorry i cannot see a photo can you send it to me?
a 40cm diameter wheel accelerates uniformly from 240 rpm to 360 rpm in 6.5 seconds. how far will a point on the edge of the wheel have traveled in this time
Answer:
S = V1 t + 1/2 a t^2 distance traveled for linear acceleration
θ = ω1 t + 1/2 α t^2 equivalent angle for rotational acceleration
ω1 = 240 / min * 2 π * 240 / (60 s/min) = 8 π / s
ω2 = 360 rpm = 12 π / s
α = 4 π/ 6.5 s^2 = .62 π / s^2 angular acceleration
θ = 8 π / s 6.5 s + .62 π / 2 * 6.5^2
θ = 52 π + 13 π = 65 π = 65 * π / (2 π / rev) = 32.5 rev
1 rev = 2 * π * R = 2 * π * .4 m = 2.51 m / rev
S = 32.5 rev * 2.5 m/rev = 81 m
a spaceship is traveling through space. suddenly, its speed increases. what can you say about the kinetic energy of the spaceship?
Through space, a spacecraft is moving. It picks up speed abruptly. How would you characterize the spacecraft's kinetic energy? As the speed rises, the kinetic energy does too.
In plain English, what is kinetic energy?An object's kinetic energy refers to the energy it has as a result of motion. Applying force is necessary if we wish to accelerate an object. We have to put forth work to apply a force. After the job is finished, the object will be travelling at a new, constant speed because energy has indeed been transferred to it.
What is kinetic energy, and how is it used?Velocity is the force that propels motion, which can be seen in the movement of a particle, an object, or a group of particles. A person walking, a baseball being thrown, a piece of food falling from the a tabletop, as well as a charged particle inside an electric field all are instances of objects in motion that use kinetic energy.
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a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s. exactly 5.6 s later, its speed is 6.60 m/s. what is the puck's average acceleration?
-1.17 is the average acceleration when a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s. Perfectly,5.6 s later, its speed is 6.60 m/s.
What is an average acceleration?The rate of change in velocity, or the change in velocity per unit time, is known as average acceleration. The square of the distance over time is used to measure acceleration. Hence, the unit of acceleration is known to be as m/[tex]s^{2}[/tex]. Average is read as a symbol with a bar over it, so a-bar represents average acceleration.Solution:Given:
Initial sped =13.20m/sFinal speed=6.60m/stime taken=5.6sNow, to find the average acceleration we use the following formula;
Acceleration, [tex]a_{avg}[/tex] =[tex]\frac{v^{final}-v^{initial} }{time}[/tex]
⇒[tex]a_{avg}[/tex]=6.60-13.20/5.6 = -1.17m/[tex]s^{2}[/tex]
Hence, -1.17 is the average acceleration when a hockey puck is hit on a frozen lake and starts moving with a speed of 13.20 m/s. Perfectly, 5.6 s later, its speed is 6.60 m/s.
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.An object has a mass of 10 kg and an acceleration of 20 m/s2. What is the force on the object?
The force acting on the object is 200 Newton.
What is force?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.
Given that mass of the object: m = 10 kg.
acceleration of the object = 20 m/s^2.
Hence, according to Newton's 2nd law of motion:
Force = mass × acceleration
= 10 × 20 Newton
= 200 Newton.
Hence, the force on the object is 200 Newton.
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after i stops my lexus engine, the warning sign appears when open door, but off when close the door, why?
Your door-ajar light may turn on for a variety of reasons depending on the type of vehicle you drive: a dome light short in terms of electricity. The anti-theft system experienced an electrical short. a door switch that was stuck to the "open" setting.
The effects that an electrical short has.Appliance damage, electrical shock, or even a fire may result from a short circuit. And if you don't take any steps to prevent short circuits, the likelihood that these events will occur will only rise.
An electrical short, also known as a short circuit, is a low-resistance connection between two conductors, which are components allowing electricity to flow through them. A short happens when a current takes an unintended detour instead of taking the intended path.
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when you looked at solar activity on the heliophysics event registry website, on which date did you find activity on the sun?
You did look at solar activity on the heliophysics event registry website, and we found activity on the sun on the specified day.
What three sorts of solar occurrences are there?Any natural occurrence in the upper atmosphere of the sun is referred to as a solar phenomenon. Solar flares, prominences and filaments, and coronal mass ejections are three different categories of solar phenomena.
How can I follow the cycle of solar activity the best?The simplest way we can investigate how solar activity changes over time is to survey sunspots, which is also how we track the solar cycle. Sunspots are associated with the Sun's natural 11-year cycle, during which the planet's surface changes from calm to turbulent.
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a baseball is thrown by a pitcher at 95 mph through standard air. the diameter of the baseball is 2.82 in. estimate the drag force on the baseball
The baseball's drag force, FD, is equal to 0.4995 Jlb. The baseball has a 2.82-inch diameter.
What does a force mean in science?In physics, the word "force" appears to have a clear definition. A force does not "be in it" or "be contained by" an object. A force from another can exert pressure on something.
What do force and motion mean?In essence, force is a push or pull that has an impact on anything or energy as a feature of physical motion or movement. It happens when two things get in touch. In addition, while a body is moving, it is considered to be in motion.
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Which two waves
combine to form a surface wave?
•
two transverse waves
•
two longitudinal waves
O a transverse wave
a and a longitudinal wave
a transverse wave and a light wave
A surface wave is a combination of a transverse wave and a longitudinal wave
What is a surface wave?A surface wave is a mechanical wave that propagates along the interface between differing media. A surface wave is made up of transverse and longitudinal wave
A transverse wave is a wave in which particles of the medium move up and down perpendicular to the direction of the wave. A longitudinal wave is a wave in which particles of the medium move parallel to the direction of the wave.
Surface waves usually have larger amplitudes and longer wavelengths than body waves, and they travel more slowly than body waves do.
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two planets are identical, except planet x has an atmosphere of mostly nitrogen and planet y has an atmosphere of mostly carbon dioxide. what can you determine about the planets
Two planets are identical, except planet x has an atmosphere of mostly nitrogen and planet y has an atmosphere of mostly carbon dioxide therefore what we can determine about the planets is that x is Earth while y is Venus.
What is Atmosphere?This is referred to as the envelope of gases surrounding the earth or another planet and it makes life possible by providing different organisms with air to breathe
In the atmosphere of the planet Venus there is a high concentration of carbon dioxide as it is made up of it is made of 96.5% of CO₂ and a 3% of nitrogen.
On the other hand in the atmosphere of the planet Earth, there is a high concentration of nitrogen which is about 78% and is therefore the reason why they were chosen as the correct choices.
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what should the rotation curve for this galaxy look like for radii larger than 5 kpc, do you think? after 5kpc...
The rotation curve for this galaxy look like for raddi larger than 5kpc is angular velocity.
What is angular velocity?Angular velocity is the speed at which the angle between 2 bodies changed whenever an object rotated or revolvers around an axis. This displacements is depicted in the images by the angle firmed by a line on one body andar a line on the other.
Angular velocity can be defined as the Speed at which an item rotates or revolvers around an axis. The Greeks letter Omega (occasionally ) stands for angular velocity. The SI unit for angular velocity is radians per second because it is the expressed as an angle per unit of times.
Orbital speed increase with radius beacuse it is directly proportional to radius
Since V=wr
So on increasing with radius orbital speed also increases.
So here w is angular velocity.
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John walks to the pizza place for lunch. He walks 2 km north, then 1 km east. To get home, he walks 2 km west and 1 km south. What distance did he travel? What is his displacement?
Answer:
The total distance covered is 3 km and the displacement is 2.24 km.
Explanation:
For the total distance covered by Anthony, we just add all of the distances.
1 km (going east) + 1 km (going east again) + 1 km (going south) = 3 km
Hence, the his total distance covered when he went to the pizza place is 3 km.
Solving for the displacement is a different matter. We cannot just add all of the distances. From analysis of the problem, Anthony traveled and formed a right triangle. He traveled 1 km east twice, making it 2 km east in total, then he traveled 1 km south.
When dealing with a right triangle with 2 sides given (for this problem the two sides are the 2 km east and the 1 km south), we use the Pythagorean Theorem.
Solution:
c² = a² + b² (Pythagorean Theorem)
c will be the longest side of the right triangle
a and b will be the other sides of the right triangle
c = √ (a² + b²)
c = √ (2² km + 1² km)
c = √5 km
c = 2.2361 km ≈ 2.24 km
Therefore, the displacement of Anthony is 2.24 km.
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when the distance between two masses doubles, the strength of the gravitational force between them ―
When the distance between two masses doubles, the strength of the gravitational force between them is decreased by a factor of 4.
Gravitational Force:
Any two mass-containing objects are attracted to one another by gravitational force. Because it consistently attempts to pull masses together rather than pushing them apart, the gravitational force is known as attractive. In reality, everything in the cosmos is tugging on everything else, including you! Newton's Universal Law of Gravitation is what it is known. Admittedly, you aren't pushing on those other objects all that much because you don't have a very large mass. Additionally, items that are very far apart from one another do not clearly tug on one another. However, we can calculate the force because it exists.
It is given by,
[tex]F=\frac{GMm}{r^{2} }[/tex]
We can clearly evaluate from the above formula that
[tex]F[/tex] ∝ [tex]\frac{1}{r^{2} }[/tex]
So,
When the distance between two masses doubles, the strength of the gravitational force between them is decreased by a factor of 4.
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an increase in sound level from 30 db to 50 db requires an increase in sound intensity by a factor of:
Loudness increases by 10 dB for every dB increase in sound intensity. A 40-decibel light rainstorm is 100 times louder than a whisper, whereas a 30-decibel "silent" room is 10 times louder than a 20-decibel whisper. Loud noises can be harmful.
50 dB is how much louder than 20 dB?A 10 dB rise results in a two-fold increase in volume. The loudness will therefore rise by nearly 8 times with a 30 dB increase (from 20 dB to 50 dB).
Decibels are measured on a logarithmic scale using a power of ten, which might be perplexing. For those of you without advanced math degrees, this simply implies that the sound intensity doubles for every 10 decibel rise.
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Design a safety restraint or device for a motorcycle 4-wheeler or go-kart. Design may be drawn or describe. Be sure to explain how your devices protects the driver against collision forces.
this is very urgent, please help!!
Answer:
Explanation:
One possible safety restraint or device for a motorcycle 4-wheeler or go-kart could be a roll cage. A roll cage is a structure that surrounds the driver and is designed to protect them in the event of a rollover or collision.
The roll cage would be made of strong, lightweight material such as steel or aluminum tubing. It would be attached to the frame of the 4-wheeler or go-kart and would extend upward to surround the driver's head and shoulders. The roll cage would also have additional bracing to provide additional support and protection in the event of a collision.
In the event of a rollover or collision, the roll cage would help to distribute the forces of the impact evenly around the driver, protecting them from the full force of the collision. The additional bracing would also help to prevent the roll cage from collapsing or deforming, providing additional protection for the driver.
In addition to the roll cage, the driver could also wear a safety harness or seat belt to help keep them securely attached to the vehicle and prevent them from being thrown out in the event of a collision. This would provide additional protection against the forces of a collision.
2. An energetic golden hamster (Mesocricetus auratus) is running at a
constant speed on its frictionless exercise wheel (25.0 cm diameter,
weighing 25.0 g). If the hamster is considered part of the exercise wheel
system (his efforts are internal to the system), how much work is being
done on the hamster-wheel system?
The work done by the hamster-wheel system is 0.0625 J.
What is work done in a system or by a system?The work done by a system or on a system is a measure of the energy input used to do useful work such as moving an object a given distance when force is applied.
Work done is defined as the product of the force applied and the distance moved by the force applied in the direction of the applied force.
Mathematically;
work done = force * distanceThe unit of the applied force is Newton; the unit of the distance moved is in meters and the unit of measurement of work done is Joules.
The work done by the hamster-wheel system is given below:
Force of the hamster = mass * acceleration due to gravity
Force on hamster = 25/ 1000 * 10
Force = 0.25 N
Distance = 25.0 cm or 0.25 m
Work done = 0.25 * 0.25
Work done = 0.0625 J
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100 POINTS AND BRAINLIEST IF YOU CAN ANSWER
On a position vs. time graph for an object, a horizontal line segment indicates that the object is
A. at its starting location.
B. not moving and is at rest.
C. located at ground level.
D. moving at a constant rate.
Answer:
The answer is D. moving at a constant rate.
Explanation:
I've had this question before.
In the position-time graph, the horizontal line segment indicates that the object is not moving and is at rest. Therefore, option (B) is correct.
What is the Position Time Graph?The position vs time graph on which the instantaneous position of a particle is plotted on the y-axis and the time is plotted on the x-axis is called the Position-Time graph.
In the position vs time graph always take an independent variable on the x-axis and dependent variables must be plotted on the y-axis. Through mathematical function, the dependent variable will be dependent on the independent variable.
In the case of the Kinematic equation of uniform acceleration, the position can be defined as a dependent variable and time will be the fundamental independent variable.
The case of the horizontal line in the position vs. time graph indicates that the position of the object is not changing with time so it is at rest.
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a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. How much work was done by the dog ?
The work done by the dog is 0.81J.
What is work done?Work done is a measure of energy expended in moving an object; most commonly calculated by multiplying the force by the distance.
It is said that no work is done if the object does not move.
The work done on an object is the amount of energy transferred to an object through work.
According to this question, a dog lifts a 0.75 kg bone straight up through a distance of 0.11 m. The force applied to break the bone must be calculated first as follows:
Force = mass × acceleration
Force = 0.75kg × 9.8m/s²
Force = 7.35N
Work done = 7.35N × 0.11m = 0.81J
Therefore, 0.81J is the work done by the dog.
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a positive charge is moving to the right and experiences an upward magnetic force. in which direction must the magnetic field have a component?
The rightward motion of a positive charge is accompanied by an upward magnetic pull. There must be a component of the magnetic field that enters the page.
How does magnetic force work?The total force operating on an electric charge can be expressed as the sum of the electric force and the magnetic force acting on the object if a point charge q is placed in the presence of both a magnetic field of magnitude B (r) and an electric field of magnitude E (r).
How does a magnetic field respond to an electric current?Electric Field A magnetic field forms around a wire when an electric current flows through it. The magnetic field also creates a ring of concentric circles around the wire.
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an object in shm oscillates with a period of 4.0 s and an amplitude of 16 cm. part a how long does the object take to move from x
The object takes to move is 0.409s.
Calculaiton:
time period T = 4 s
Angular speed ω = 2π/T= 1.57 rad/s
SHM equation
x = A sin ωt
6 = 10 sin(1.57t)
sin(1.57t) = 0.6
1.57 t = 0.6435
t= 0.409s.
The amplitude of a periodic variable is a measure of its change over one period. The amplitude of an aperiodic signal is its magnitude relative to a reference value. Amplitude has various definitions, all of which are functions of the magnitude of the difference between extreme values of a variable. It refers to the maximum displacement from equilibrium exhibited by a body in periodic motion.
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Which of the following statements is correct?
A) The internal energy of a system increases when more work is done by the system than heat was flowing into the system.
B) The internal energy of a system decreases when work is done on the system and heat is flowing into the system.
C) The system does work on the surroundings when an ideal gas expands against a constant external pressure.
D) All statements are true.
E) All statements are false.
This is a state function, and the internal energy is the sum of the kinetic and potential energies of all the particles in the system.
How can one define the internal energy of a system?A system's internal energy is the sum of all the energies that are present in it, including the mechanical, chemical, potential, kinetic, and so forth. The unit of measurement for internal energy is the letter J, which stands for joules (J).The total internal energy of a system with particular limits is made up of the kinetic energy brought about by the motion of molecules, the potential energy brought about by their vibrational motion, and the electric energy of the atoms contained within those molecules.The internal energy is an initial- and boundary-dependent state function.An abundance of internal energy exists.ΔU = q + W serves as the fundamental formula for the internal energy for a closed system.Heat, internal energy change, and mechanical work are all represented by the unit ΔU.To Learn more About internal energy refer To:
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5. if the star sirius emits 23 times more energy than the sun, why does the sun appear brighter in the sky? include the terms luminosity and apparent brightness in your response.
The star Sirius is indeed brighter but our Sun appears to be brighter because it is closer to us.
The intrinsic luminosity of Sirius is exactly 25.4 times more than the sun but if we compare the distances of these stars, Sirius is 8.6 light years away from us and the Sun is just 8 light minutes away from us. This marks the obvious reason why our Sun appears more bright.
Even mathematically, it can be justified as the apparent brightness of any luminous object depends on the inverse square of the distance of that luminous object. Therefore the sun's light energy dominates our sky and we can't see any traces of Sirius from the earth.
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Adaline walks 2.0 miles north to school from her house. After school, she walks 2.0 miles south from the school to her house. What is her displacement?
0 miles
1.0 miles, north
2.0 miles, south
4.0 miles, north
0 miles
Explanation:
delta displacment=position end-position beginning
The displacement of Adaline if she walks 2.0 miles north to school from her house. After school, she walks 2.0 miles south from the school to her house is zero miles so, option A is correct.
What is displacement?The overall modification of an object's location and direction of motion is referred to as displacement. Since displacement considers both the amount of the changing location and the direction of the motion, it is known as a vector quantity. There may be zero, positive, or negative displacement.
Given:
Adaline walks 2.0 miles north to school from her house. After school, she walks 2.0 miles south from the school to her house,
Calculate the displacement as shown below,
Displacement = Distance from house to school + Distance from school to house,
Displacement = 2 + (-2) (North direction is taken as positive and south direction is taken as negative)
Displacement = 0 miles
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The radioactive hydrogen isotope 3h is called tritium. it decays by beta-minus decay with a half-life of 12.3 years. What is the daughter nucleus of tritium?
The daughter nucleus of tritium is a helium nucleus with two protons and two neutrons.
What is tritium?It is an isotope of hydrogen. During decay, Tritium nucleus emits an electron and an antineutrino, and changes it from a Tritium with one proton and two neutrons, to a Helium nucleus with two protons and one neutron.
What is helium?Helium is an inert gas.
What is nucleus?Nucleus is positively charged mass at the centre of the atom consisting of positively charged protons and neutral neutrons.
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Two forces of 5N and 12N act at a point The two force first act in opposite directions
a, Make a sketch showing the direction of the forces.
b, calculate the resultant of the forces and mark its direction on your sketch.
The resultant of the force that acts in opposite directions is 7 N.
What is the resultant force?We know that the resultant force is the force that has the same effect in magnitude and direction as two or more forces that is acting together. We have to note that the force that is actinmg on an object is a vector quantity. The implication of this is that the magnitude and the direction of the forces that are acting on the body is very important.
By the use of the law of vectors we can be able to write in the case of the question that we have here, we can see that the forces are acting in the opposite directions. The implication of this is that we would have to subtract the forces so as obtain the resultant force.
We have to note that when we have opposite forces, one is said to be positive and the other negative and the resultant force can be found by subtraction. As such the resultant force can be obtained from;
Let the +B force be 12 N
Let the -B force be 5N
12 N - 5 N = 7 N
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Find the y-component of this
vector:
42.2°
101 m
Remember, angles are measured from
the +x axis.
Y-component (m)
The y-component of the given vector is 67.84 m.
What is a vector quantity?The quantities that exhibit both magnitude and direction can be defined as vector quantities. For example, a boy is riding a cycle with a velocity of 30 km/hr in a southeast direction. Then to define the velocity, we require two things which are the magnitude of the velocity and the direction. Therefore, it expresses a vector quantity.
The components of the vector can be represented as:
x = r cosθ
y = r sinθ
Given the value of r, = 101 m
The angle, θ = 42.2°
The y-component of this vector can be calculated as:
y = 101 ×sin 42.2°
y = 67.84 m
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Police are reinvestigating a cold case from 10 years ago. They have exhumed the body and an autopsy is being performed. The forensic scientist detected a poison in the bones of the body, which led to an eventual arrest of a suspect. What poison was MOST likely found?
A. cyanide
B.arsenic
C.mercury
D. strychnine
The poison was most likely found was B)arsenic
What is poisioning?
Poisoning is defined as harm or death brought on by ingesting, inhaling, touching, injecting, or ingesting different medications, chemicals, venoms, or gases. Many chemicals, including pharmaceuticals and carbon monoxide, become dangerous only when they are consumed in large quantities. While some cleaners only cause harm when consumed, others also release hazardous vapors or fumes.
When large doses of arsenic are ingested or inhaled, arsenic poisoning, also known as arsenicosis, occurs. Gray, silver, or white in hue, arsenic is a form of carcinogen. For humans, arsenic is exceedingly dangerous. Because it has no taste or odor, arsenic is particularly hazardous because you can be exposed to it covertly. After death, the toxin leaves residues on the body.
Hence the poison was most likely found was B)arsenic
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3. A car travels 64.4 km in 0.5 hr. Calculate the car's average speed in km/hr.
Answer:
128.8Km/h
Explanation:
S=d/t
=64.4/0.5
=128.8
a car accelerates uniformly from rest to 25 m/s over a distance of 30 meters. what is the acceleration of the car?
Answer:
a=25/24 m/s^2
Explanation:
I’m going to assume you mean the final velocity is 25m/s.
v^2=u^2+2as
625=0+2a300
a=25/24 m/s^2 or 1.0416^_ (period 1) ^m
If an object has constant velocity, then one can be sure that the object is not ____.
Answer:
accelerating
Explanation:
untill an unbalanced force acting on a body, object at rest remain stationery while object on motion continue moving in constant velocity.
no resultant force means no acceleration.
