which is a standard unit of measurement
Answers
Amount of substance - mole (mole)
Electric current - ampere (A)
Temperature - kelvin (K)
Luminous intensity - candela (cd)
Related Questions
When you travel 20km in 1 hour, at what speed do you travel.
Answers
Answer:
at 20km/h
Explanation:
Error and uncertainty are interchangeable words that describe the same concept.
Answers
Error is the difference between actual value and the calculated value.
Uncertanity of a measured value in an interval around that value such that any repetition of measurement will produce a new result that lies within the interval.
Hence, error and uncertanity are interchangeable words that describes the same concept.
PLEASE HELP MEEE!!!
In a science experiment showing the splitting of water into Oxygen and hydrogen, two inverted test tubes of water were placed over the site of the reaction. (see the pic) How can you tell which one was catching the oxygen and which one was catching the hydrogen?
A. The hydrogen is a positive ion and will be located close to the negative terminal of the battery.
B. The oxygen is a negative ion which will be located next to the negative terminal of the battery.
C. There are 2 hydrogen atoms for every oxygen atom. The hydrogen will take up more space and is pushing the water lower in the test tube.
D. The hydrogen, being a smaller atom, will take up less space than the oxygen. It will push the water down less.
Answers
Answer:
Option C
Explanation:
Answer C is the correct option. water can be written as H₂O, which means that there are 2 Hydrogen atoms for every oxygen atom, therefore it will occupy more space than oxygen and push more. there is also one more possibility, if the splitting takes place in Hoffman's Voltameter then the Hydrogen will be close to the cathode as hydrogen is positive. Otherwise, option C is correct answer. Hope this Helps you!
an image is 4.0 mm in front of a converging lens with focal length 5.0 mm. where is the object for this image
Answers
The object of this image will be formed in front of lens with object distance v of -2.22 mm.
1/S' + 1/S = 1/f
-1/4 +1/S = 1/5
S = 20/9 mm = 2.22 mm
1/v-1/u=1/f
So
1/(-4)-1/u=1/5
So
v=-2.22mm in front of lens as we are getting same sign as that for image i.e negative.
Concave lenses or diverging lenses divert light rays, whilst convex lenses or converging lenses focus light rays to a particular spot. In accordance with the laws of refraction, a lens is a transparent substance with a flat or curved surface.Positive, or converging, narrow lenses combine incident light rays that are parallel to the optical axis and focus them at the focal plane to create a true image.For more information on converging lens kindly visit to
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What is true about most of the mass in the universe?
A. It was created in the last 30,000 years. B. It is invisible to astronomers.
C. It has already decayed into pure energy.
D. It is made of nitrogen atoms.
Answers
Answer:
B. It is invisible to astronomers.
Explanation:
Most of the mass in the universe exists in the form of dark matter, which is invisible to astronomers.
anyone know the answer?
Answers
For freely falling objects near earth's surface, _____ is constant.
A
acceleration
B
speed
C
velocity
D
momentum
Answers
The correct option is A. acceleration.
For freely falling objects near Earth's surface, acceleration is constant. An object that is allowed to fall freely under the influence of Earth's gravity is known as a freely falling object. Gravity is an acceleration that acts on any two masses.
For freely falling objects near Earth's surface, the acceleration is indeed constant. This fundamental concept is a result of gravity's influence on objects in free fall. When an object is in free fall, it means that no forces other than gravity are acting upon it. In this scenario, the acceleration experienced by the object remains constant and is equal to the acceleration due to gravity, which is approximately 9.8 meters per second squared (m/s²) near Earth's surface.
The constancy of acceleration in free fall can be attributed to the consistent force of gravity acting on the object. Gravity pulls objects downward towards the center of the Earth, causing them to accelerate uniformly. Regardless of the object's mass, shape, or composition, the acceleration remains constant. This is known as the equivalence principle, which states that all objects experience the same acceleration due to gravity in the absence of other forces.
As an object falls freely, its velocity increases at a steady rate. Each second, the object's velocity increases by approximately 9.8 m/s. This means that in the first second, the velocity increases by 9.8 m/s, in the second second it increases by an additional 9.8 m/s, and so on. The consistent acceleration enables the object to cover greater distances in successive time intervals.
In conclusion, for freely falling objects near Earth's surface, the acceleration remains constant at approximately 9.8 m/s². This constancy arises from the unchanging force of gravity acting on the objects, leading to a uniform increase in velocity over time.
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what is v^2=0.05-4.9 please i need this asap
Answers
Answer:
v =2.02
Explanation:
v^2=0.05-4.9
v^2=-4.85
square root both side
v=2.02
^^^^this is a not a perfect square
An air pressure reading of 987.5 mb would be placed on a station model as
Answers
Answer:
875
Explanation:
The digits more significant than the last two integer digits are dropped from the pressure reading placed on the upper right of the station model. Generally, the dropped digits will be 9 or 10.
987.5 mb would be recorded as 875 on the model.
blood flows through a major artery at 1.2 m/s over a distance of 0.40 m , then at 0.60 m/s for another 0.40 m through a smaller artery.
Answers
The blood flows through a major artery at 1.2 m/s over a distance of 0.40 m and then at 0.60 m/s for another 0.40 m through a smaller artery.
The average velocity of an object is defined as the total displacement divided by the total time taken. In this case, we are given the velocities and distances of blood flow through two different sections of arteries. To find the average velocity, we need to calculate the total displacement and the total time taken.
In the first section, the blood flows at a velocity of 1.2 m/s over a distance of 0.40 m. Using the formula for average velocity:
Average velocity in the first section = total displacement in the first section / time taken in the first section.
Since the velocity is constant, the time taken in the first section can be calculated as:
time taken in the first section = distance in the first section / velocity in the first section.
Substituting the given values, we have:
time taken in the first section = 0.40 m / 1.2 m/s.
Similarly, in the second section, the blood flows at a velocity of 0.60 m/s over a distance of 0.40 m. Using the same approach as above, we can calculate the time taken in the second section.
Finally, the total time taken is the sum of the time taken in the first and second sections. The total displacement is the sum of the distances in both sections. Dividing the total displacement by the total time taken gives us the average velocity of the blood flow throughout the entire distance.
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Which of the following properties of electromagnetic radiation are described by wave behavior?
Choose one or more:
- Coherent, monochromatic light sources may interefere.
- Light is refracted as it goes from one transparent medium to a different transparent medium.
- The energy of light is present in photons.
- Light is defracted as it bends around the edges of objects.
Answers
Properties of electromagnetic radiation described by wave behavior include interference of coherent, monochromatic light sources and the phenomena of refraction and diffraction.
How are these properties wave-like?The following properties of electromagnetic radiation are described by wave behavior:
- Coherent, monochromatic light sources may interfere: Interference is a characteristic behavior of waves. When coherent, monochromatic light waves meet, they can interfere constructively or destructively, resulting in patterns of light and dark regions.
- Light is refracted as it goes from one transparent medium to a different transparent medium: Refraction is the bending of light as it passes through different mediums due to a change in its speed. This phenomenon is explained by the wave behavior of light.
- Light is diffracted as it bends around the edges of objects: Diffraction occurs when waves encounter an obstacle or aperture and bend around it, resulting in the spreading out of the wavefront. Light exhibits diffraction when it encounters obstacles or passes through narrow openings, which is another wave behavior.
The property "The energy of light is present in photons" is more closely associated with the particle-like behavior of light. According to quantum theory, light can also behave as a stream of particles called photons. While wave-particle duality is a fundamental aspect of light, the concept of energy being present in photons emphasizes its particle nature rather than wave behavior.
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Two rockets, A and B, approach the earth from opposite directions at speed 0.800 . The length of each rocket measured in its rest frame is 100 m. What is the length of rocket A as measured by the crew of rocket B?
Answers
The length of rocket A as measured by the crew of rocket B is 60 meters.
Length of the object in its own rest frame = L = 100 m
The relative velocity between the two frames = V = 0.800c
In the given case, it is required to use the Lorentz transformation formula for length contraction to determine the length of rocket A as measured by the crew of rocket B. The equation is provided by:
L' = L x √(1 - (v²/c²))
L' denotes the object's length as measured in the alternate frame, in this example, by the crew of rocket B.
Substituting the values into the formula -
= 100 x √(1 - (0.800²/1²))
= 100 x √(1 - 0.64)
= 100 x √(0.36)
= 100 x 0.6
= 60
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find the potential energy of a diver of mass 75kg at a height of 10m above a swimming pool g=9.8m
Answers
Answer:
\( \boxed{\sf Potential \ energy \ (PE) = 7.35 \ kJ} \)
Given:
Mass (m) = 75 kg
Height (h) = 10 m
Acceleration due to gravity (g) = 9.8 m/s²
To Find:
Potential Energy (PE)
Explanation:
The formula for potential energy due to gravity:
\( \boxed{ \bold{PE = mgh}}\)
Substituting value of m, g & h in the formula:
\( \sf \implies PE = 75 \times 10 \times 9.8 \\ \\ \sf \implies PE = 7350 \: J \\ \\ \sf \implies PE = 7.35 \: kJ\)
in the circuit diagram below, three identical light bulbs are connected to a battery. what happens to the brightness of bulb 1 when the switch is closed?
Answers
Answer:
The brightness of bulb 1 dies because it is switched off.
Newton throws an apple straight up at 10 m/s. What is the ball's velocity
after 1.4 seconds?
Answers
Answer:
23.72m/s
Explanation:
The final velocity can be calculated using the formula:
V = u + at
Where; v = final velocity (m/s)
u = initial velocity (m/s)
a = acceleration due to gravity (m/s²)
t = time (s)
Based on the provided information, u = 10m/s, t = 1.4s, a = 9.8m/s²
V = 10 + (9.8 × 1.4)
V = 10 + 13.72
V = 23.72m/s
If a 325 W heater has a current of 6.0 A, what is the resistance of the heating element?
O 10 Ohms
O 50 Ohms
88 Ohms
9 Ohms
Answers
The resistance of the heating element is 9 Ohms
What is Ohm's law?Ohm's law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) between them. Mathematically, this can be expressed as:
V = IR
Equation:In this scenario, we are given the power (P) and current (I) of a heater, and we are asked to find its resistance (R). Power can be calculated using:
P = IV
where V is the voltage across the heater. Since we are not given the voltage, we can rearrange Ohm's law to solve for the resistance:
R = V/I
Substituting the formula for power into this equation, we get:
R = (V/I) = (P/I²)
Substituting the given values of power and current, we get:
R = (325 W) / (6.0 A)² = 9.0 Ohms
The correct answer is (D).
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very dense material when heated will give off a ____ spectrum.
Answers
When very dense material is heated, it produces a continuous spectrum. A continuous spectrum is an electromagnetic radiation that displays a continuous range of wavelengths or colors.
The spectrum has no gaps or breaks and is seen as a smooth, unbroken band of colors that blend into each other.A continuous spectrum is created by solids, liquids, and dense gases when heated. The molecules in these materials begin to move around more quickly when they absorb thermal energy.
As a result of this motion, the electrons in the atoms within the material are excited to higher energy levels.This means that the electrons move from lower energy levels, which are closer to the atomic nucleus, to higher energy levels, which are further away from the nucleus. When the electrons transition back to their lower energy states, they release energy in the form of electromagnetic radiation.
The radiation that is released includes a continuous range of wavelengths, which produce a continuous spectrum.Continuous spectra are important in astronomy because they help scientists learn about the temperatures of the objects producing the radiation. By analyzing the spectrum, they can determine the temperature of the object.
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What is the net force in this image?
a
8000 N right
b
5000 N right
c
4000 N right
d
4000 N left
e
5000 N left
f
8000 N left
Answers
Answer:
4000N left
Explanation:
6000N-1000N-1000N
6000N-2000N
8000N
Describe how perceptual errors, cognitive biases, or emotions
have negatively affected you in a negotiation. Share at least three
examples (one perceptual error, one cognitive bias, and one
emotional)
Answers
Perceptual errors, cognitive biases, and emotions can indeed have negative effects on negotiations. Here are three examples illustrating each:
1. Perceptual error: One common perceptual error is the halo effect, where an overall impression of a person or situation influences the perception of specific attributes or qualities. In a negotiation, I may have made the mistake of perceiving my counterpart as more competent and trustworthy due to their confident demeanor and well-dressed appearance. This perceptual bias may have led me to underestimate their true intentions or overlook potential risks.
2. Cognitive bias: Confirmation bias is a cognitive bias where we seek and interpret information in a way that confirms our pre-existing beliefs or expectations. During a negotiation, I might have had a confirmation bias that my proposed solution was the best option. As a result, I might have selectively paid attention to information that supported my viewpoint and dismissed or ignored evidence that challenged it. This bias could have hindered open-mindedness and prevented me from considering alternative solutions.
3. Emotion: Emotions play a significant role in negotiations and can impact decision-making. For example, I might have experienced strong frustration during a negotiation due to the slow progress and lack of cooperation from the other party. This emotional response could have impaired my ability to think rationally and objectively, leading to impulsive or aggressive behavior. It might have also hindered effective communication and collaboration, potentially damaging the negotiation process.
In negotiations, it's important to be aware of these potential pitfalls and actively work to mitigate their effects. Developing self-awareness, practicing empathy, seeking diverse perspectives, and employing logical analysis can help counteract the negative impact of perceptual errors, cognitive biases, and emotional responses.
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a star-forming cloud flattens into a disk that spins faster as the cloud contracts because of conservation of angular momentum. then material from the disk gradually spirals inward toward the newly forming star at the center, accreting onto its surface and adding to its mass. what would we find if we could measure the orbital speeds of gas particles in the accretion disk? suppose there were no friction in the disk orbiting the protostar; would this affect the orbital speeds? overall, how would a lack of friction change the process?
Answers
The conservation of angular momentum would still hold true and the particles would continue to orbit at the same rate.
What is the conservation of angular momentum?If we could measure the orbital speeds of gas particles in the accretion disk, we would find that the speeds decrease as we move farther from the centre of the disk.
This is because the gas particles in the outer regions of the disk are farther from the protostar and are moving at a slower rate due to the gravitational force being weaker.
If there were no friction in the disk orbiting the protostar, the orbital speeds of the gas particles would not be affected. This is because the conservation of angular momentum would still hold true and the particles would continue to orbit at the same rate.
Overall, a lack of friction in the disk would make it more difficult for gas particles to lose energy and fall inward toward the protostar. This would result in a slower rate of accretion onto the protostar and a longer overall timescale for the star formation process.
However, other factors such as turbulence and magnetic fields may also play a role in the accretion process and could affect the overall outcome.
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Cart A (m = 2.0 kg) is traveling to the right at 4.0 m/s toward Cart B. Cart Y (m = 8.0 kg) is traveling to the left at 2 m/s. Which cart has the larger magnitude of momentum, and why?
Answers
Answer:
1. Cart Y has a larger magnitude of momentum.
2. Because the mass of cart Y is larger than the mass of cart A.
Explanation:
The following data were obtained from the question:
Mass of cart A (mₐ) = 2 Kg
Velocity of cart A (vₐ) = 4 m/s
Mass of cart Y (mᵧ) = 8 Kg
Velocity of cart Y (vᵧ) = 2 m/s
1. Determination of which of the cart has a larger magnitude of momentum.
For Cart A:
Mass (mₐ) = 2 Kg
Velocity (vₐ) = 4 m/s
Momentum of cart A (pₐ) =?
Momentum = mass × velocity
pₐ = mₐ × vₐ
pₐ = 2 × 4
pₐ = 8 Kgm/s
Thus, the momentum of cart A is 8 Kgm/s
For Cart Y:
Mass (mᵧ) = 8 Kg
Velocity (vᵧ) = 2 m/s
Momentum of cart Y (pᵧ) =?
Momentum = mass × velocity
pᵧ = mᵧ × vᵧ
pᵧ = 8 × 2
pᵧ = 16 Kgm/s
Thus the momentum of cart Y is 16 Kgm/s
SUMMARY:
The momentum of cart A is 8 Kgm/s
The momentum of cart Y is 16 Kgm/s
Therefore, cart Y has a larger magnitude of momentum.
2. Determination of the reason why cart Y has a larger magnitude of momentum.
Momentum is simply defined as the product of mass and velocity i.e
Momentum = mass × velocity
Thus, an increase in either mass or velocity will increase the momentum.
Considering the question given and the solution obtained:
Cart A:
Mass (mₐ) = 2 Kg
Velocity (vₐ) = 4 m/s
Momentum of cart A (pₐ) = 8 Kgm/s
Cart Y:
Mass (mᵧ) = 8 Kg
Velocity (vᵧ) = 2 m/s
Momentum of cart Y (pᵧ) = 16 Kgm/s
From the above data, we can see that the mass of cart Y (i.e 8 Kg) is larger than the mass of cart A (i.e 2 Kg).
Thus, we can conclude that the magnitude of the momentum of cart Y is larger than that of cart A irrespective of their velocities because the mass of cart Y is larger than the mass of cart A.
What is a 60 kg car's velocity if it has a momentum of 2400 kg m/s?
Answers
Answer:
40m/s
Explanation:
momentum = mass * velocity
momentum / mass = velocity
2400kg*m/s / 60kg = 40m/s
A stationary 0.325 kg steel ball begins rolling down a frictionless track from a height h as shown in the diagram. It completes a loop-the-loop of radius 1.20 m with a speed of 6.00 m/s at the top of the loop. What is the gravitational potential energy of the ball at the top of the loop?
Answers
The ball at the top of the loop has a gravitational potential energy of 7.55 J.
The kinetic energy of the ball at the top of the loop is equal to its gravitational potential energy before it begins to fall. The total energy of the ball is the sum of its kinetic and gravitational potential energies. We can calculate the gravitational potential energy of the ball at the top of the loop by using the equation given below; PE=mghwhere, m=mass, g=acceleration due to gravity, and h=height above the reference level. Substituting the values we get, PE=(0.325 kg)(9.8 m/s2)(2.4 m)=7.55 J. Therefore, the gravitational potential energy of the ball at the top of the loop is 7.55 J. A stationary steel ball of 0.325 kg rolling down the track from height h completes a loop of radius 1.20 m with a velocity of 6.00 m/s at the top of the loop. We need to calculate the gravitational potential energy of the ball at the top of the loop. The gravitational potential energy of an object is the energy it possesses due to its height above the reference level. The kinetic energy of the ball at the top of the loop is equal to its gravitational potential energy before it begins to fall. The total energy of the ball is the sum of its kinetic and gravitational potential energies. We can calculate the gravitational potential energy of the ball at the top of the loop by using the equation given below; PE=mghwhere, m=mass, g=acceleration due to gravity, and h=height above the reference level. Substituting the values we get, PE=(0.325 kg)(9.8 m/s²)(2.4 m)=7.55 J. Therefore, the gravitational potential energy of the ball at the top of the loop is 7.55 J.For more questions on gravitational potential energy
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A downward electric force of 5.6N is exerted on a −8.2μC charge. Find the magnitude of the electric field at the position of this charge.
Answers
The magnitude of the electric field at the position of the charge is 6820 N/C.
The electric field E can be calculated using Coulomb's Law, which states that the force between two charged particles is proportional to the product of their charges and inversely proportional to the square of the distance between them:
F = k * q1 * q2 / r^2
Where k is the Coulomb constant (8.99 x 10^9 N * m^2 / C^2) and r is the distance between the charges. If we have only one charge q1 and a force F on it, we can rearrange the equation to find the electric field at its position:
E = F / q1
Plugging in the given values, we have:
E = 5.6 N / -8.2 x 10^-6 C = -6820 N/C
So, the magnitude of the electric field at the position of the charge is 6820 N/C.
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A student is creating an electromagnet for an investigation. Which feature of the electromagnet will least influence the magnetic force? answer choices
the material of the core
the number of wire coils
the size of the power source
the brand of the battery
Answers
A student is creating an electromagnet for an investigation, and the one feature of the electromagnet that will have the least influence on the magnetic force is the brand of the battery, which is the last option.
What is electromagnet ?The magnetic force of an electromagnet is determined by a number of factors, such as the material of the core and the number of wire coils, and the size of the power source but the brand of the battery don't have an effect on the magnetic force of the electromagnet as long as the battery provides the necessary voltage and current to power the electromagnet.
Hence, the one feature of the electromagnet that will have the least influence on the magnetic force is the brand of the battery, which is the last option.
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Which of the following best defines a nonrenewable resource?
A resource that cannot be replenished
A resource that is difficult to recover
A resource that is replenished at a rate slower than it is used
Any resource that exists in finite quantities (there is only a certain amount)
Answers
Answer:
I think it's this A resource that is replenished at a rate slower than it is used
Any resource that exists in finite quantities (there is only a certain amount)
Answer:
A resource that is difficult to recover.
The steering of truck is havear than car why
Answers
Answer:
Because trucks usually weight a lot more than cars, thus there is more weight on the front wheels, making them harder to turn do to increased friction.
how to install goodman heat pump with ducting apartment
Answers
Answer:
Explanation:
Use a pump for that u poor man
Limits of Lorentz contraction formula - L1/1- 3. In the theory of relativity, the Lorentz contraction formula v2 LU) = L01 c2 expresses the measured length (by an observer) L of an object as a function of its velocity v with respect to an observer, where Lo is the length of the object at rest, and c is the speed of light. (a) Using the limit laws, find limo+c- L. Justify each step of your work (and don't skip any steps!). (b) Interpret the result. (c) Why is a left-hand limit necessary?
Answers
A left-hand limit is required because the formula becomes a division by zero when the observer travels at the speed of light or faster than the speed of light.
The Limits of the Lorentz contraction formula are given by the following:(a) Using the limit laws, find limo+c-L.
Justify each step of your work (and don't skip any steps!).
lim (L1/√1 - (v/c)^2)
= L0l/sqrt(1) - (0)^2lim (L1/1 - 0)
= L0l/1 = L0 + c - L0= c(b)
Interpret the result.
The answer to (a) is c. The length of the moving object will appear to be shorter than the object's actual length, L0, when measured by an observer. As a result, when a moving object moves at a speed equal to the speed of light, it appears to be compressed to an infinite amount of time.
A left-hand limit is required because the formula becomes a division by zero when the observer travels at the speed of light or faster than the speed of light.
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an inductor with l = 9.85 mh is connected across an ac source that has voltage amplitude 40.0 v. You may want to review (Pages 1023 -1028) For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of An inductor in an ac circuit Part A What is the phase angle ф for the source voltage relative to the current? Express your answer with the appropriate units.
Answers
The inductance (L) is 9.85 mH (millihenries), we need to convert it to henries by dividing it by 1000, resulting in 0.00985 H.
Why is the inductance value converted from millihenries to henries?In an AC circuit, the phase angle (ф) between the source voltage and the current in an inductor can be determined using the formula:
ф = arctan(ωL/R)
where ω is the angular frequency of the AC source, L is the inductance, and R is the resistance in the circuit.
Given that the inductance (L) is 9.85 mH (millihenries), we need to convert it to henries by dividing it by 1000, resulting in 0.00985 H.
The phase angle (ф) can be calculated once we know the angular frequency (ω) and the resistance (R) in the circuit. However, the problem statement does not provide the value of the resistance. Without the resistance value, it is not possible to determine the exact phase angle (ф).
To calculate the phase angle, you need to know the value of the resistance in the circuit and the angular frequency of the AC source. Please provide the value of the resistance so that I can assist you further in calculating the phase angle.
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