Answer:
Accuracy is ‘the state of being correct’ and on the other hand precision is ‘the state of being exact.
Explanation:
Accuracy shows the nearness of the measurement with the actual measurement while precision shows the nearness of an individual measurement with other measurements.
Accuracy focuses on the errors caused by the problem in the instrument. while precision is concerned with errors, which occurs periodically with no recognizable pattern.
If the measurement is precise but inaccurate, the result will not be the expected one. And if the result is accurate but imprecise, then there are huge variations in the measurements. And finally, if the actual measurement is neither accurate nor precise, then the result would not have correctness and exactness at the same time.
Describe what physical meaning is attributed to ψ 2
Car a runs a red light and broadsides car b, which is stopped and waiting to make a left turn. car a has a mass of 1,800kg. car b has a mass of 1,500kg. after the impact, the cars stick together and slide away at a speed of 7.1m/s. how fast was car a going when it hit car b?
The law of conservation of momentum tells us that momentum is conserved, therefore total initial momentum should be equal to total final momentum. In this case, we can expressed this mathematically as:
mA vA + mB vB = m v
where, m is the mass in kg, v is the velocity in m/s
since m is the total mass, m = mA + mB, we can write the equation as:
mA vA + mB vB = (mA + mB) v
furthermore, car B was at a stop signal therefore vB = 0, hence
mA vA + 0 = (mA + mB) v
1800 (vA) = (1800 + 1500) (7.1 m/s)
vA = 13.02 m/s
With respect to energy, which is not necessarily a goal of chemistry ?
Answer:
I believe I know your answer choices, the answer would be finding ways to use energy
Explanation:
In chemistry we have a way to store the power, we use batteries to store this energy, so it can’t be this. We also have a way to produce it consistently, using wind power and solar panels. We currently are making strides to conserve energy, by sharing consumptions graphs with others. Chemistry is all about finding the use for it! There possibilities never end, which makes this goal, and more importantly, the answer.
Variable A and variable B have an indirect relationship. If variable A decreases, how will variable B respond?
The most common listening problem is
A. trying to listen to two people at once.
B. assuming what the other person has to say isn't important.
C. paying attention but misinterpreting the message.
D. not giving other people a chance to talk.
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how long does it take to walk 0.13 miles
a skydiver falls 3km in 15s. How fast are they going. i need my answer in meters! (20 PTS)
You place a book on top of a spring and push down, compressing the spring by 10 cm. When you let go of the book, it is pushed up by the spring. Which statement describes what happens to the energy of the spring-book-system?
Answer: The gravitational potential energy of the system increases.
Explanation:
Which of the activities below are examples of projectile motion? Check all that apply. A. A football thrown down the field B. A tennis ball tossed up before a serve C. An apple falling from a tree D. An airplane landing
Answer:
A, B and C
Explanation:
An object thrown with a speed at some angle near the Earth undergoes a projectile motion. It moves in a curved path under the action of gravity only. The object is known as projectile. options A, B and C are examples of projectile motion. These objects move under the action of gravity only.
An airplane landing is in control of its motion and does not move just under the action of gravity. So, it cannot be considered as projectile motion.
Imagine a landing craft approaching the surface of callisto, one of jupiter's moons. if the engine provides an upward force (thrust) of 3264 n, the craft descends at constant speed; if the engine provides only 2203 n, the craft accelerates downward at 0.39 m/s2. what is the weight of the landing craft in the vicinity of callisto's surface?
Final answer:
The weight of the landing craft on the surface of Callisto is 3264 N, derived by analyzing the force provided by the craft's engine in two different scenarios according to Newton's second law of motion.
Explanation:
The question involves understanding Newton's second law of motion, which is F = ma, where F is the net force applied to the object, m is the mass of the object, and a is the acceleration.
When the engine provides an upward force (thrust) of 3264 N, the craft descends at a constant speed, implying that the thrust balances out the weight of the craft (weight = gravitational force). Therefore, the net force, F, is zero, and the acceleration is 0 m/[tex]s^{2}[/tex]. When the thrust is only 2203 N, the craft accelerates downward at 0.39 m/[tex]s^{2}[/tex]. To find the weight of the landing craft on Callisto's surface, we can use the given data from the two scenarios.
To solve, let's denote the mass of the landing craft as m, and the acceleration due to gravity on Callisto as g. Thus, the weight of the landing craft, which is the gravitational force, can be expressed as W = mg.
From the second scenario, we have:
F - W = ma
2203 N - mg = m(0.39 m/[tex]s^{2}[/tex])
Since the first scenario tells us that F = W when F is 3264 N, substituting back, we get mg = 3264 N. We therefore find the weight of the landing craft to be 3264 N on the surface of Callisto.
About one-third of the toxic metal, mercury (hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from ____.
a. human activities
b. waste from livestock
c. airplane exhaust
d. automobile exhaust
e. mercury-rich plants
About one-third of the toxic metal, mercury (Hg), is released into the air from natural sources, such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from human activities.
What is mercury?Mercury is the 80th element in periodic table. It is a heavy metal but exists as liquid in room temperature. Mercury is a transition metal having wide applications in various industries.
Mercury is toxic in nature and reported to be dangerous to human health, even causes death by concentric exposure. Global mercury contamination is a result of human activities including mining and the burning of fossil fuels.
Mercury that is released into the air eventually sinks into the ground or is washed into the water. Once deposited, specific microbes can transform it into methylmercury, a very poisonous form that accumulates in fish, shellfish, and animals that consume fish.
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What types of collisions can result from making unsafe passes?
Which attribute do employers state is the bestone for an office professional to have?
A. Punctuality B. Computer proficiency C. Integrity D. Positive attitude
Answer:
Option C integrity.
Step-By-Step Explanation:
The best attribute for an office professional to have is Integrity
Because if you are following integrity you will be in ethical manner whoever say anything to you.Your mind will not make you to lose your values which is the most important thing in anybody's life.
If you do not have integrity you may lose and you lose your temper you will get quite or pretty much aggressive and you may get fired.
WHY did NASA scientist Madhulika Guhathakurta compare the solar eclipse to the 1969 moon landing?
A) The moon landing illustrated the importance of scientific discovery in 1969, and she believes the solar eclipse will be remembered as a similarly important event today.
B) The moon landing was a landmark event in 1969 that demonstrated the importance of NASA, a fact she is using to persuade President Trump not to cut NASA funding.
C) The solar eclipse is similar to the moon landing because both used new technologies to share information about scientific events with the public.
D) The solar eclipse is similar to the moon landing because they both relate to space and discovery despite occurring nearly 50 years apart.
The solar eclipse is compared to the 1969 moon landing due to their significance in space and discovery, despite the time gap. Both events captivated the public and demonstrated advancements in technology and our understanding of the universe.
Explanation:NASA scientist Madhulika Guhathakurta compared the solar eclipse to the 1969 moon landing because both events were significant in terms of space and discovery, despite occurring nearly 50 years apart. The moon landing was a historic achievement in human space exploration, and the solar eclipse, while not a human accomplishment, is a rare celestial event that offers valuable scientific insights. Both events captivated the public and showcased the advancements in technology and our understanding of the universe.
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On the ignition switch, the ________ position provides power to electrical equipment including lights, wipers, warning lights and radio, without turning on the engine.
ACC is an Autonomous cruise control or adaptive cruise control is a system for road vehicles that automatically adjusts the vehicle speed (can increase or decrease the speed) to maintain a safe distance from vehicles ahead.
There are also many other names of Autonomous cruise control such as active cruise control, intelligent cruise control, or radar cruise control.
If the energy bar was his only fuel, how far could a 68 kg person walk at 5 km/h?
To calculate how far a 68 kg person could walk at 5 km/h based on the energy from an energy bar, you need to know the energy content of the bar. Then, you would estimate the energy expenditure during walking and use that to estimate the distance that person could cover.
Explanation:Your question refers to energy and distance covered by a person walking at a certain speed, making it a topic of Physics. However, the computation of how far a 68 kg person can walk at 5 km/h, given a certain amount of energy (derived from an energy bar), requires more information.
We would specifically need to know the amount of energy provided by the energy bar. Once we have that, we can dive into understanding that energy consumption during physical activity, like walking, is determined by body mass and speed among other factors.
A common estimation of energy expenditure due to walking is made using the formula 0.1×weight(kg)×distance(km). After obtaining the energy content of the bar, we can rearrange that formula to find the distance: distance = energy/(0.1×weight). With that calculation, you could answer how far the person can walk based on the energy released by the bar.
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The distance between twin satellites that were originally 150 meters apart are now 300 meters apart. Which best describes the gravitational force between the twin satellites? A) it increased by 1/2 B) it decreased by 1/4 C) it increased by a factor of 2 D) it decreased by a factor of 4
Answer : (B) it decreased by 1/4
Explanation :
It is given that :
The distance between twin satellites that were originally 150 meters apart are now 300 meters apart.
When the satellites are 150 m apart then the gravitational force is :
[tex]F=G\dfrac{m_1m_2}{(150\ m) ^2}[/tex]..........(1)
Similarly, when the satellites are 300 m apart then the gravitational force is :
[tex]F'=G\dfrac{m_1m_2}{(300\ m) ^2}[/tex]...........(2)
From eq (1) and (2)
[tex]\dfrac{F_c}{F_c'}=4[/tex]
[tex]F_c'=\dfrac{F_c}{4}[/tex]
So, the gravitational force between the twin satellites is decreased by 1/4.
Hence, the correct option is (b).
Answer:
B: it decreased by 1/4
Explanation:
Calculate the wavelength of a wave if 80 complete waves occupy a length of 20cm
This question is just so simple. All we have to do to get the wavelength is to divide the length by the number of waves.
Wavelength = 20 cm / 80 waves
Wavelength = 0.25 cm / wave = 0.25 cm
Or if in meters, Wavelength = 2.5 x 10^-3 m
an input force of 20 newtons is applied to a lever at a distance of 2 meters from the fulcrum and object 0.5 M away from the fulcrum and on the other side is lifted by the 20-N force what is the output force?
A beam of monochromatic light goes from material 1 with index of refraction n1 into material 2 with index of refraction n2. the frequency of light in material 1 is f1 and in material 2 is f2. what is the ratio of f1/f2?
To solve this problem, we should remember that the formula for index of refraction is defined as:
n = c / v
or
n v = c
Where,
n = index of refraction
c = speed of light
v = speed of light in the medium
Since speed of light is constant, then we can simply equate the materials 1 and 2:
n1 v1 = n2 v2
Where the speed of light in the medium (v) can be expressed as:
v = w * f
Where,
w = wavelength of light
f = frequency of light
Therefore substituting this back into the relating equation:
n1 w1 f1 = n1 w2 f1
Since it is given that the light is monochromatic, w1 = w2, this further simplifies the equation to:
n1 f1 = n2 f2
f1 / f2 = n2 / n1 (ANSWER)
The ratio of the frequency of light in two different materials can be found using their refractive indices and the equation n1*f1 = n2*f2.
The ratio of the frequency of light in two different materials is determined by their refractive indices.
In physics, the frequency of light can be related to the speed of light in different media using the index of refraction.
The equation n1*f1 = n2*f2 expresses the relationship between the frequencies of light in material 1 and material 2.
The ratio of frequencies f1/f2 of monochromatic light when moving from one material to another is 1, because the frequency of light remains constant across different media.
The student asks about the ratio of the frequencies f1 and f2 of monochromatic light going from one material with index of refraction n1 to another with index of refraction n2. This question pertains to the physics concept of refraction and properties of light as it travels through different media. The frequency of light does not change when it passes from one medium to another, as frequency is an intrinsic property of the wave that is independent of the medium. Therefore, the ratio of the frequencies f1/f2 is equal to 1, or f1=f2.
Why do dark-colored rock pocket mice on dark lava flows have white bellies?
The dark-colored rock pocket mice on dark lava flows have white bellies, as there is no selection for dark bellies by visual predators.
What is natural selection?Natural selection is the process of choosing an animal with specific traits for the next generation.
A genetic mutation that alters their hue caused this to happen. This is a consequence of natural selection in turn. Those with advantageous qualities are decided by nature to survive and procreate.
The procedure that improves an organism's chances of surviving is called a mutation. A dark belly can be advantageous for reproduction. White bellies are crucial for camouflaging.
Therefore, due to the lack of selection for dark bellies by visual predators, the dark-colored rock pocket mice on black lava flows have white bellies.
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Can someone please help me? I think it might be (D) but I'm not sure...And I need the answer as soon as possible!
Which best explains why a washing machine represents an open system?
(A) It has multiple cycles, such as wash or spin
(B) Most washers can use a variety of laundry detergent brands
(C) The amount of wash in a load varies
(D) Water and Power come from external sources
The answer is D I took the test
What substance is reduced in a lead storage battery?
In lead acid battery, chemical reactions are induced to do work on charge and produce a voltage difference between the two output terminals.
In a lead storage battery, the negative terminal is composed of lead electrode (Pb2+) while in the positive terminal it is composed of lead dioxide electrode (PbO2).
The chemical half reactions in each electrode are:
Negative Terminal: Pb2+ + SO4(2-) ---> PbSO4 + 2e
Lead electrode is oxidized to supply electrons.
Positive Terminal: PbO2 + H2SO4 + e ---> PbSO4
Lead dioxide electrode is reduced by the addition of electrons.
Answer: Lead dioxide is reduced.
Provides some background for this problem. a ball is thrown vertically upward, which is the positive direction. a little later it returns to its point of release. the ball is in the air for a total time of 7.70 s. what is its initial velocity? neglect air resistance.
If you divide a force measured in newtons (1 newton = 1 kg*m/s^2) by a speed expressed in meters per second, in what units will the answer be expressed?
If you are riding in a vehicle equipped with a lap belt and also a separate shoulder belt, you are
Riding in a vehicle with a lap belt and a separate shoulder belt provides significant protection in car accidents. The lap belt secures the lower body while the shoulder belt secures the upper body.
Explanation:If you are riding in a vehicle equipped with a lap belt and also a separate shoulder belt, you are using one of the most effective safety measures for passenger vehicles. These belts, when used together, greatly reduce the chance of serious injury or death in a car accident. The lap belt secures your lower body, preventing you from sliding forward or sideways, while the shoulder belt protects your upper body, preventing you from being ejected from the vehicle or hitting the interior elements during a collision.
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What energy is calculated from an object's mass height and the acceleration due to gravity?
Albert views henry moving by at a constant velocity. henry has a light clock and also a stopwatch which were synchronized when at rest. as albert views these two moving clocks, which of these statements would be true according to albert? the light clock runs slow compared to the stopwatch. the stopwatch runs slow compared to the light clock.
Answer:
The two are still synchronized but run slow
Explanation:
Time flows at a different rate for an object that is moving. The time of the object which is moving is running slower than an object which is stationary. Here, Albert is stationary so time will flow faster for him and for Henry who is moving time will flow slower. This phenomenon is called time dilation
[tex]\Delta t'=\frac{\Delta t}{\sqrt{1-\frac{v^2}{c^2}}}[/tex]
Where,
Δt is the time elapsed for the person who is moving
Δt' is the time elapsed for the person who is stationary
c = Speed of light = 3×10⁸ m/s
v = Velocity of the object which is moving
Answer: D
Explanation:
The two are still synchronized but run slow.
How long (in ns) does it take light to travel 1.30 m in vacuum?
If two cars had the same engine, which delivered the same force to the wheels, but the first car was more massive than the second would the cars perform differently?