The amount of light that undergoes reflection or transmission is demonstrated by how bright the reflected or transmitted ray is. The amount of transmission is maximized, and the amount of reflection is minimized under specific conditions.
When a light ray moves from one medium to another, it undergoes refraction and reflection. The magnitude of these effects is governed by the index of refraction of the medium from which the light ray originates and the medium to which it is directed. There is minimal reflection and maximum transmission when the refractive index of both mediums is close.
At the same time, some of the light reflects back into the air due to the difference in refractive indices between the air and the glass. This is termed total internal reflection.If the angle of incidence of the light ray is increased beyond the critical angle, total internal reflection occurs. When the angle of incidence equals the critical angle, the light ray travels parallel to the surface of the medium interface.
The magnitude of reflection decreases as the angle of incidence rises beyond the critical angle. This results in minimal reflection and maximum transmission.
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Ture/False?
1) Earth's core is mostly made up of iron and magnesium.
2) Scientists think that movements in the liquid inner core create Earth's magnetic field.
Answer:
True
True
Explanation:
In order to measure motor units in the electromyography (EMG) simulator, you should
A. count how many unique peaks you have in the green plot.
B. measure the distance between two consecutive peaks of the same type in the green prot.
C. measuring the largest peak-to-peak value
D. count how many unique peaks you have in the blue plat
To measure motor units in the electromyography (EMG) simulator, the most appropriate method would be measuring the distance between two consecutive peaks of the same type in the green plot. So, option B is correct.
Electromyography is a technique used to evaluate and record the electrical activity produced by skeletal muscles. Motor units consist of a motor neuron and the muscle fibers it innervates. The EMG simulator generates signals that mimic the electrical activity of motor units.
By measuring the distance between two consecutive peaks of the same type in the green plot, we can obtain valuable information about the firing pattern and recruitment of motor units. The peaks represent the action potentials generated by individual motor units.
The distance between peaks can indicate the firing rate or the time interval between successive action potentials.
Counting the number of unique peaks in either the green or blue plot (options A and D) may not provide a comprehensive measure of motor units. It might only give an estimation of the number of active motor units, but it doesn't provide information about their firing patterns or recruitment.
Measuring the largest peak-to-peak value (option C) may not be as informative either because the size of the action potentials can vary depending on factors such as the proximity of the electrode to the motor unit or the intensity of the simulated muscle contraction.
Therefore, measuring the distance between two consecutive peaks of the same type in the green plot is a more reliable method to assess motor units in an EMG simulator, as it provides insights into their firing patterns and recruitment dynamics.
So, option B is correct.
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An athlete walks 8 meters East , 2 meters South, 8 meters West, and finally 2 meters North. What is the total distance traveled?
Answer:
the sum of all the values which is 20 meters
Explanation:
total is everything combined
Distance is the sum of an object's movements, regardless of direction. The distance can be defined as the amount of space an object has covered, regardless of its starting or ending position. The total distance traveled is 20m.
A scalar quantity distance measures "how much ground an object has covered" while moving. The term "how far out of place an object is" relates to displacement, a vector number that describes the total change in the position of the object.
Distance is the length of an object's real route in its entirety. The International System of Units specifies that the unit of distance is the meter.
Total distance = 8 + 2 + 8 + 2
D = 20 m
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Look up the radius and mass of the Moon. Using this information to calculate the acceleration of gravity on its surface. If a person weighs 120 lb on Earth, how much does he/she weigh on Moon?
A person who weighs 120 pounds on earth would weigh approximately 20 pounds on the moon. This is because the force of gravity is weaker on the moon due to its lower mass and smaller size. The radius of the moon is about 1,737 km (1,080 miles) while its mass is approximately 7.342 × 10²² kg (81 billion tons).
Using this data, we can calculate the acceleration of gravity on the moon's surface which is about 1.62 m/s².A person who weighs 120 pounds on earth would weigh approximately 20 pounds on the moon.
Here's how to calculate the acceleration of gravity on the moon's surface:G = GM / R² where G is the acceleration of gravity, M is the mass of the moon, and R is the radius of the moon.
We know that M = 7.342 × 10²² kg and R = 1,737 km = 1,737,000 meters so we can plug in these values to find G.G = (6.67 × 10⁻¹¹ N(m/kg)²) (7.342 × 10²² kg) / (1,737,000 m)²G = 1.62 m/s²
Therefore, the acceleration of gravity on the moon's surface is 1.62 m/s².
A person who weighs 120 pounds on earth would weigh approximately 20 pounds on the moon. This is because the force of gravity is weaker on the moon due to its lower mass and smaller size.
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A ball was dropped and had a mass of .2 kg and was falling with a force of 2 N, what was its acceleration?
Answer:
10m/s I believe
Explanation:
F=MA
A=F/M
A=2/0.2
A=10m/s
1. How much heat must be absorbed by 375 grams of water to raise its
temperature by 25° C?(Cp of water is 4.184)
Answer:
39225J
Explanation:
Given parameters:
Mass of water = 375grams of water
Change in temperature = 25°C
Specific heat capacity of water = 4.184J/g°C
Unknown:
Amount of heat absorbed = ?
Solution:
To solve this problem, we use the expression below:
H = m c Ф
H is the heat absorbed
m is the mass
c is the specific heat capacity
Ф is the change in temperature
Insert the parameters and solve;
H = 375 x 4.184 x (25) = 39225J
5. The Hall coefficient and conductivity of Cu at 400 K have been measured to be 0.45x10-10 m³/As and 6.5 /ohm-meter respectively. Calculate the drift mobility of the electrons in Cu.
The drift mobility of electrons in Cu is the ratio of the electric field to the charge carried by an electron and the time it takes for an electron to reach from one end of a conductor to the other under an applied electric field.
The Hall coefficient is defined as \(RH = (1/ne) * (dVH/dB)\) where n is the charge density, e is the charge of an electron, VH is the Hall voltage, and B is the magnetic field. To calculate the drift mobility of the electrons in Cu, we will first determine the charge density n using the Hall coefficient.
We can then use the conductivity and charge density to calculate the drift mobility. Given, Hall coefficient \(RH = 0.45 × 10^-10 m^3/A s\) and Conductivity \(σ = 6.5 /ohm\) meter at a temperature of 400K. (Magnetic field)
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A car traveling in a straight line with an initial velocity of 10 m/s accelerates at a rate of 3.0 m/s² to a velocity of 34 m/s. a. How much time does it take for the car to reach the velocity of 34 m/s? b. What is the distance covered by the car in this process? e: Compute values of the distance traveled at 1-second intervals and carefully draw a graph of distance plotted against time for this Motion
We can plot the distance (s) on the y-axis against time (t) on the x-axis using these values. The graph will start at (0, 0) and gradually increase until it reaches (8, 80), forming a smooth curve.
To compute the values of distance traveled at 1-second intervals and draw a graph of distance plotted against time for this motion, we'll use the equations of motion.
a. The initial velocity (u) is 10 m/s, the final velocity (v) is 34 m/s, and the acceleration (a) is 3.0 m/s². We can use the equation v = u + at to find the time (t) it takes for the car to reach the velocity of 34 m/s.
34 = 10 + 3t
Simplifying, we have:
3t = 24
t = 8 seconds
So, it takes 8 seconds for the car to reach a velocity of 34 m/s.
b. To find the distance covered by the car in this process, we can use the equation s = ut + (1/2)at². Plugging in the values, we have:
s = (10 * 8) + (1/2) * 3 * (8²)
s = 80 + 12 * 64
s = 80 + 768
s = 848 meters
The distance covered by the car is 848 meters.
Now, let's compute the distances at 1-second intervals:
At t = 0 seconds, the initial position is 0 meters.
At t = 1 second, s = (10 * 1) + (1/2) * 3 * (1²) = 13.5 meters.
At t = 2 seconds, s = (10 * 2) + (1/2) * 3 * (2²) = 26 meters.
At t = 3 seconds, s = (10 * 3) + (1/2) * 3 * (3²) = 37.5 meters.
At t = 4 seconds, s = (10 * 4) + (1/2) * 3 * (4²) = 48 meters.
At t = 5 seconds, s = (10 * 5) + (1/2) * 3 * (5²) = 57.5 meters.
At t = 6 seconds, s = (10 * 6) + (1/2) * 3 * (6²) = 66 meters.
At t = 7 seconds, s = (10 * 7) + (1/2) * 3 * (7²) = 73.5 meters.
At t = 8 seconds, s = (10 * 8) + (1/2) * 3 * (8²) = 80 meters.
Now, we can plot the distance (s) on the y-axis against time (t) on the x-axis using these values. The graph will start at (0, 0) and gradually increase until it reaches (8, 80), forming a smooth curve.
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if it takes 20 n to move an object 20m how much work was done
Answer:
\(\boxed{Work \: done = 400 \: N-m}\)
Explanation:
Force = 20 N
Displacement =20 m
Work Done = Force × Displacement
= 20 × 20
= 400 N-m
Mrs. James mixes tomatoes, bananas, and garden rocks together. She has made a:
natural salad.
Line-wise Answer-Mrs. James mixes tomatoes, bananas, and garden rocks together. She has made a natural salad.
Hope it helps you...
Benjemin
Copernicus patterned his concept of the solar system after that of
Ptolemy
Aristarchus
Galileo
Kepler
Answer:
Aristarchus
Explanation:
don't feel like it
a student is supplied with the following pieces of equipment:
• a small metal ball
• table tennis ball
• metre rule
• stop clock
• calculator
• light gate
• data logger
describe how the student can use this, or other additional equipment, to determine an accurate value for the acceleration of free fall (g). the student need not use all the equipment. show clearly what measurements should be taken and how the students should use these in determining (g). describe one source of error and how this might affect the value of (g).
(6 marks/year9/gcse)
Explanation:
Use a meter stick, small metal ball, stopwatch, calculator.
Have the students mark off a vetrtical distance from which to drop the metal ball. Ready the stopwatch, and start when the object is dropped and stop when the object contact the ground. Repeat 5 times and average the stopwatch times.
Now, use the formula d=vo+(1/2)at^2
There's no initial velocity, so d=(1/2)at^2
We know time and distance, so we can solve for a, acceleration.
2d=at^2
(2d)/(t^2)=a
Now, input the numbers gathered in the experiment in meters and seconds.
One source of error is human error (stopwatch timing)
Air resistance (although pretty negligible)
3. A 100 W electric lamp uses 100 joules of
electrical energy each second. It produces
only 2 W of light. What is its efficiency?
What happens to the other 98 W?
The efficiency of the incandescent lamp is only 2%, and the remaining 98 W of electrical energy that it consumes per second is transformed into heat and electromagnetic radiation.
Provide an explanation of electromagnetic radiation.a form of energy that flows in waves and has both magnetic and electrical fields. both man-made and natural factors contribute to it. Low energy to high energy electromagnetic radiation is all available. It consists of x-rays, gamma rays, infrared, visible, and ultraviolet light as well as radio waves and microwaves.
There are seven different forms of electromagnetic radiation.The components of the EM spectrum are designated as gamma rays, Anti - anti, ultraviolet radiation, photons, infrared light, and radio waves, in that sequence, from highest to lowest energy. a subset of is microwaves.
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How would YOU define speed?
Answer:
Speed is a way of measuring how quickly something is moving or being done, or something moving fast. An example of speed is a car being driven 45 miles per hour. An example of speed is someone cleaning a room in 10 minutes.
An ant moves towards the plane mirror with speed of 2 m/s & the mirror is moved towards the ant with the same speed. What is the relative velocity between the ant and its image?
We know
\(\boxed{\sf Relative\:velocity(V_{AB})=V_A-V_B}\)
\(\\ \sf\longmapsto V_{AB}=2-2\)
\(\\ \sf\longmapsto V_{AB}=0m/s\)
The vector difference between the velocities of two bodies : the velocity of a body with respect to another regarded as being at rest compare relative motion
\(Relative velocity $\left(\mathrm{V}_{\mathrm{AB}}\right)=\mathrm{V}_{\mathrm{A}}-\mathrm{V}_{\mathrm{B}}$$$\begin{aligned}&\longmapsto \mathrm{V}_{\mathrm{AB}}=2-2 \\&\longmapsto \mathrm{V}_{\mathrm{AB}}=0 \mathrm{~m} / \mathrm{s}\end{aligned}$$\)
What is relative velocity and its unit?The relative velocity of an object with respect to another is the velocity with which one object moves with respect to another object. The unit of velocity can be referred to as the ratio of unit of distance and that of time. The SI unit of Relative velocity is meter per second.
What is absolute velocity?The concept of absolute velocity is mainly used in turbomachinery design and defines the velocity of a fluid particle in relation to the surrounding, stationary environment. Together with the relative velocity (w) and the circumferential speed (u), it forms the velocity triangle.
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An electric geyser consumes 2.2units of electrical energy per hour of its use. It is designed to work on 220v. What is the resistance of this device? Find the cost of energy consumed if each unit costs Rs 6.00.
Answer:
Explanation:
The resistance of this device is determined by using the formuia from Ohms Law:
V = IR
where; V = voltage
I = current
R = resistance
From the above equation:
R = V/ I ---- (1)
And
I = P/V --- (2)
If 1 unit = 1 KWH = 3.6 × 10⁶ J
Then;
2.2 units = (3.6 × 10⁶ × 2.2)
= 7.92 × 10⁶ J
So, Energy = 7.92 × 10⁶ J
Also:
Power = energy/time
Power = 7.92 × 10⁶ J / 1 hour
Power = 7.92 × 10⁶ J / 3600 seconds
Power = 2200 Watts
From equation (2)
I = P/V
I = 2200/220
I = 10 A
Recall that:
Resistance R = V/I
Resistance R = 220/10
Resistance R = 22 ohms
SO, if 1 unit costs = Ts 6.00
Then the cost of 2.2 unit = 2.2 ( Rs 6.00)
= Rs 13.20
What is the force applied to a baseball that has a mass of 142kg and has a acceleration of 30m/s to the power of 2
Using Newton's second law
\(\\ \sf\Rrightarrow F=ma\)
\(\\ \sf\Rrightarrow F=142(30)\)
\(\\ \sf\Rrightarrow F=4260N\)
What happens to the waterspouts after rain begins to fall?a.
it makes the rainspout stronger
c.
it dissipates
b.
it slows it down
d.
none of these
Answer:
c. it dissipates.Explanation:
Waterspouts are rotating columns of air over water that are similar to tornadoes. They form when there is a significant temperature difference between the air and water, and usually dissipate when they reach the surface of the water or when the conditions that caused them to form change. Rainfall can disrupt the conditions that sustain waterspouts, causing them to dissipate.Which of these is most likely to be a centrifugal force within the EU in the future?
Among the given options, cultural differences are most likely to be the centrifugal force within the EU in the future. The EU is a political and economic union of 27 member states, and cultural differences among its member states have always been present.
With the increasing number of immigrants from different parts of the world, the cultural differences among EU member states are becoming more prominent. Each member state has its unique language, history, customs, and traditions, which can create misunderstandings and conflicts among the member states.
The EU aims to promote unity and solidarity among its member states, but cultural differences can lead to a lack of understanding and trust between them. The EU's diverse cultural heritage is both a strength and a challenge for the union. The EU needs to find a way to respect the cultural diversity of its member states while maintaining its unity.
However, the cultural differences among the member states can still cause tensions and conflicts in the future. Therefore, it is crucial for the EU to continue to foster cultural awareness and understanding among its member states to maintain the union's cohesion and stability.
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complete question:
Which of these is most likely to be a centrifugal force within the EU in the future?
a. trade barriers
b. closed borders
c. pollution problems
d. cultural differences
11. What kind of force did the levitating rings display? What does this say
about the magnetic domains of these objects? Record your evidence.
answer :
force is called the magnetic force of repulsion, and it happens when two magnets have the same poles (either both north or both south) and they push away from each other.
When all the domains in a material are aligned in the same direction, the material becomes strongly magnetized.
explanation :
magnetic domains in the rings were stable and strong enough to resist the force of gravity.
In the case of the levitating rings, the magnetic domains were aligned in such a way that they created a strong magnetic field, which allowed the rings to levitate in mid-air.
tiny regions within ferro magnetic material that have their own magnetic fields are called magnetic domains.
Magnetic domains in the rings refer to the tiny regions within the ring's ferro magnetic material that have their own magnetic fields.
Physics. 40 points.
Help please :) (View attached image)
Answer:
1) 10 m/s 2) 14.1 m/s 3) 6.7 m 4) 11.25 m 5) 4.5 m/s 6) 12 joules
Explanation:
Question 4 Marks: 1 A filter of 2 mm of aluminum will absorb the soft, or less penetrating, radiation.Choose one answer. a. True b. False
I am a field physicist and I perform QA measurements of various types of X-ray units. Due to recent changes in legal requirements in my country, we have to provide the radiation output value for each unit tube measured in m Gy MA's at 1 meter from focal spot) at filtration of 2,5 mm Al equivalent. a. True
This unfortunately cannot be directly achieved for interventional radiology units, some CTs and occasionally other types of X-ray units. A filter of 2 mm of aluminum will absorb the soft, or less penetrating, radiation. Aluminum is often used as a filter in radiography because it effectively absorbs low-energy, soft X-rays, while allowing more penetrating, higher-energy X-rays to pass through. This helps improve image quality and reduce patient exposure to unnecessary radiation.
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Solue the Selmultaneous equations:
3y +2x =5 and y-5x = 13
Answer:
x=-2 and y=3
Explanation:
Isolate y and then x to get: y=13+5(-2)
Simplify to get y=3 then plug it back in to get x=-2
We can check, 9+ (-4)=5 hope this helps
You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.
A. 20 N
B. 19 N
C. 21 N
D. 40 N
Answer:
A.
Explanation:
What happens to an object at rest when unbalanced forces act upon it?
When unbalanced forces act on an object at rest, the object will move. Second, when unbalanced forces act on a moving object, the velocity of the object will change. Remember that a change in velocity means a change in speed, direction or both speed and direction.
Hope this helps :)
which of the following processes always results in an increase in the energy of a system? multiple choice the system loses heat and does work on the surroundings. the system gains heat and does work on the surroundings. the system loses heat and has work done on it by the surroundings. the system gains heat and has work done on it by the surroundings. none of these is always true.
The process that always results in an increase in the energy of a system is:
the system gains heat and has work done on it by the surroundings.
What is Work Done?
Work done is the energy transferred to or from an object by means of a force acting on it, causing it to move a certain distance in the direction of the force. The amount of work done is defined as the product of the magnitude of the force and the distance moved by the object in the direction of the force. Work is a scalar quantity, and its unit is joule (J) in the SI system of units. Work can be positive, negative, or zero depending on the direction of the force and the direction of the displacement of the object.
When heat is added to a system, the internal energy of the system increases, which results in an increase in its energy. Similarly, when work is done on a system, it also results in an increase in its energy. Therefore, when both heat is added to a system and work is done on it by the surroundings, the energy of the system increases. This is because the system gains energy from both heat and work.
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9. The mass of the Sun is 1.99x 1090 kg, and the radius of the Earth's orbit around the Sun
is 1.5x1011 m From this, calculate the orbital speed of the Earth
Answer:
The orbital period of Titan ... Hyperion, another moon of Saturn, orbits at a mean radius of 1.48 x109 m. ... mass of the Sun is 1.99x1030 kg. ... calculate Pluto's orbital period in Earth days.
Part B
What trend do you observe in the Total Energy column at all the positions?
Look at the diagram of the male reproductive system. Name the parts
The testes are the primary male reproductive organs responsible for producing testosterone.
How to explain the partsVas Deferens: Also known as the ductus deferens, it is a muscular tube that carries mature sperm from the epididymis to the ejaculatory ducts.
Seminal Vesicles: These glands produce a fluid rich in fructose and other nutrients, which helps nourish and provide energy to the sperm.
Prostate Gland: It is a walnut-sized gland that produces a milky fluid containing enzymes, proteins, and other substances that contribute to se men formation.
Cowper's Glands: These small glands secrete a clear, alkaline fluid that lubricates the urethra and neutralizes any acidic urine remnants, creating a favorable environment for sperm.
Urethra: This is a tube that runs serves as a passage for both urine and semen, though not at the same time.
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What is the magnitude of the average force exerted on the arrow by the vertical wood board on right of the video as the arrow
comes to rest embedded in the wood?
According to Newton's law, action and reaction are equal and opposite.
What is action and reaction?According to the Newton's third law of motion, action and reaction are equal and opposite. As such, when the arrow hits the vertical wood board, the board exerts some force on the arrow.
We can not determine the magnitude of this force numerically because the question is incomplete.
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Answer:
newtons law action and reaction are equal and opposite
Explanation: