Answer:
Explanation: Increasing friction between surface have so many good reasons such as - generating more heat between surfaces, avoiding slippage from smooth surfaces, reducing speed of vehicles. Friction force is the force automatically acting in opposite direction of motion. Friction can be dry friction force and fluid friction force depending upon the medium of motion of object.
The National Ambient Air Quality Standards (NAAQS) are maximum allowable levels for _____ harmful pollutants. sixteen six sixty ten
Answer;
-Six
The National Ambient Air Quality Standards (NAAQS) are maximum allowable levels for six harmful pollutants. sixteen six sixty ten.
Explanation;
-The Clean Air Act requires EPA to set National Ambient Air Quality Standards (NAAQS) for six common air pollutants (also known as "criteria air pollutants. These pollutants are found all over the U.S. They can harm your health and the environment, and cause property damage.
-These pollutants are particulate matter, photochemical oxidants, carbon monoxide, sulfur oxides, nitrogen oxides and lead. They are called criteria air pollutants because its sets NAAQS for them based on the criteria, which are characterizations of the latest scientific information regarding their effects on health or welfare.
It is science time! You and your classmates have been challenged to identify six minerals. You begin with a dull, white sample that is easily scratched with a fingernail. What is the mineral?
Which of the following is the best definition of energy?
A) The ability to produce fusion.
B) the ability to do work
C) the ability to generate heat
D) the ability to generate electricity
Is it B?
What makes the north star, polaris, special?
A baseball weighs 5.19 oz. what is the kinetic energy, in joules, of this baseball when it is thrown by a major-league pitcher at 96.0 mi/h? by what factor will the kinetic energy change if the speed of the baseball is decreased to 55 mi/h
Answer:
Part a)
[tex]KE = 135.3 J[/tex]
Part b)
Factor by which KE is changed is f = 0.33
Explanation:
As we know that kinetic energy of the ball is given as
[tex]KE = \frac{1}{2} mv^2[/tex]
in order to find kinetic energy in Joule unit we need to plug in all data in SI units
so here we have
[tex]m = 5.19 oz = 0.147 kg[/tex]
now the speed of the ball is
[tex]v = 96.0 mi/h[/tex]
[tex]v = 96.0 \times \frac{1609 m}{3600 s} = 42.9 m/s[/tex]
so we will have
[tex]KE = \frac{1}{2}(0.147)(42.9)^2[/tex]
[tex]KE = 135.3 J[/tex]
Now if the speed of the ball is 55 mph
so it is
[tex]v = 55 \times \frac{1609}{3600}[/tex]
[tex]v = 24.6 m/s[/tex]
so new kinetic energy is given as
[tex]KE_2 = \frac{1}{2}(0.147)(24.6)^2[/tex]
[tex]KE_2 = 44.4 J[/tex]
So the factor by which KE is changed is given as
[tex]f = \frac{44.4}{135.3}[/tex]
[tex]f = 0.33[/tex]
A plane is flying east at 135 m/s. The wind accelerates it at 2.18 m/s squared directly north east. After 18.0s, what is the displacement (magnitude and direction) of the plane?
Approximately 4271.9 m is the magnitude of the displacement, and its direction is approximately [tex]\( 56.14^\circ \)[/tex] north of east.
To find the displacement of the plane, we need to consider both the initial velocity of the plane and the acceleration due to the wind. Let's break down the problem into horizontal (east) and vertical (north) components:
1. Horizontal Motion (East):
- Initial velocity [tex](\(v_{\text{initial}}\))[/tex] = 135 m/s (east)
- Time (t) = 18.0 s
- There is no acceleration in the east direction.
2. Vertical Motion (North):
- Initial velocity [tex](\(v_{\text{initial}}\))[/tex] = 0 m/s (since the wind accelerates the plane only horizontally)
- Acceleration (a) = 2.18 m/s² (north)
- Time (t) = 18.0 s
Horizontal Motion (East):
For the horizontal motion, since there is no acceleration, the displacement [tex](\(d_{\text{east}}\))[/tex] is simply:
[tex]\[ d_{\text{east}} = v_{\text{initial}} \times t \][/tex]
[tex]\[ d_{\text{east}} = 135 \, \text{m/s} \times 18.0 \, \text{s} \][/tex]
[tex]\[ d_{\text{east}} = 2430 \, \text{m} \][/tex]
Vertical Motion (North):
For the vertical motion, we can use the equation of motion:
[tex]\[ d_{\text{north}} = v_{\text{initial}} \times t + \frac{1}{2} a t^2 \][/tex]
[tex]\[ d_{\text{north}} = 0 \times 18.0 \, \text{s} + \frac{1}{2} (2.18 \, \text{m/s}^2) \times (18.0 \, \text{s})^2 \][/tex]
[tex]\[ d_{\text{north}} = 0 + \frac{1}{2} \times 2.18 \times 18^2 \][/tex]
[tex]\[ d_{\text{north}} = \frac{1}{2} \times 2.18 \times 324 \][/tex]
[tex]\[ d_{\text{north}} = 3513.6 \, \text{m} \][/tex]
Resultant Displacement:
To find the resultant displacement, we'll use the Pythagorean theorem since the displacement vectors form a right triangle:
[tex]\[ \text{Resultant Displacement} = \sqrt{(d_{\text{east}})^2 + (d_{\text{north}})^2} \][/tex]
[tex]\[ \text{Resultant Displacement} = \sqrt{(2430 \, \text{m})^2 + (3513.6 \, \text{m})^2} \][/tex]
[tex]\[ \text{Resultant Displacement} \approx \sqrt{5904900 \, \text{m}^2 + 12346627.36 \, \text{m}^2} \][/tex]
[tex]\[ \text{Resultant Displacement} \approx \sqrt{18251527.36 \, \text{m}^2} \][/tex]
[tex]\[ \text{Resultant Displacement} \approx 4271.9 \, \text{m} \][/tex]
Direction:
To find the direction, we'll use trigonometry:
[tex]\[ \text{Direction} = \arctan \left( \frac{d_{\text{north}}}{d_{\text{east}}} \right) \][/tex]
[tex]\[ \text{Direction} = \arctan \left( \frac{3513.6 \, \text{m}}{2430 \, \text{m}} \right) \][/tex]
[tex]\[ \text{Direction} = \arctan \left( 1.445 \right) \][/tex]
[tex]\[ \text{Direction} \approx 56.14^\circ \][/tex]
The magnitude of the displacement of the plane is approximately 4271.9 m, and its direction is approximately [tex]\( 56.14^\circ \)[/tex] north of east.
Rank them from fastest to slowest in how quickly each warms up: (a) steel, 450 j/kgââc ; (b) aluminum, 910 j/kgââc ; (c) copper, 390 j/kgââc .
A vehicle's kinetic energy can be overcome by:
a gas exerts less pressure when it has a a. smaller volume b. lower temperature c. higher temperature d. two of the above
What are the activities involved in scientific method?
The scientific method is a structured approach that scientists use to answer questions and solve problems, involving steps such as making observations, asking questions, researching, formulating hypotheses, and conducting experiments.
Explanation:In the pursuit of understanding the natural world, scientists engage in a sequence of activities known as the scientific method. This method is foundational to experimenting, observing, and learning in science. The scientific method often includes the following steps:
Making initial observations to identify a phenomenon of interest.Asking a question that seeks to explain the observation.Conducting research to gather existing knowledge on the topic.Formulating a testable hypothesis as a potential answer.Executing experiments to test the validity of the hypothesis.These steps enable a structured approach to inquiry, ensuring that conclusions are well-supported by empirical evidence. Notably, the scientific method is flexible and can vary to accommodate different scientific disciplines and types of inquiries.
How has access to the source code of proprietary software?
Answer:
Explanation:
It's a software publisher
If an object weighs 40 n on earth what would it weigh on the moon
What is the maximum altitude of Denman Orchard?
Essentially, denman is an island. 11,000 feet is the maximum altitude of Denman Orchard.
What is orchard?An orchard is indeed a planned planting of shrubs or trees that is kept up for the purpose of producing food. Trees that produce fruit or nuts are often cultivated in orchards for commercial purposes.
Large gardens may include orchards as a feature, where they serve both a decorative and functional function. Although it is situated on a smaller, non-commercial scale or may emphasis berry bushes rather than fruit trees, a fruit garden and an orchard are typically interchangeable terms. Essentially, Denman is an island. 11,000 feet is the maximum altitude of Denman Orchard.
Therefore, 11,000 feet is the maximum altitude of Denman Orchard.
To learn more about orchard, here:
https://brainly.com/question/8099966
#SPJ2
Denman Orchard reaches an altitude of about 200 yards in a fictional context, while the tallest real tree in Canada mentioned is 314 feet tall.
The maximum altitude of the fictional location known as Denman Orchard, described in a fantastical passage, is approximately 200 yards above the level plateau mentioned. This is part of an imaginative narrative and not a real-world geographical feature.
In contrast, a real-world example is provided by Randy's search for a tall tree on Vancouver Island. The tree's reported height is 314 feet, which, if accurate, would make it the tallest tree in Canada.
What is speed and what is velocity?
Hello!
Explanation:
↓↓↓↓↓↓↓↓↓↓↓
Speed is the distance traveled during a specific unit of time. Two measurements are needed to determine speed. Average speed includes the total distance and total time. Instantaneous speed includes the distance and time at a specific moment.
DistanceTimeVelocity is the displacement of an object during a specific unit of time. Two measurements are needed to determine velocity. Displacement includes a direction, so velocity also includes a direction. Velocity can be an average velocity or an instantaneous velocity.
DisplacementTimeSpeed with directionHope this helps!
Thank you for posting your question at here on brainly.
-Charlie
Filling in the blanks
A) moments are measured of the --------- effect of a force.
B) the moment is increased if the size of the force -----------
C) the moment is also increased if the force acts at a ----------- distance
D) moments are calculated using:
Moment= ------------- multiplied by -----------
E) moments are measured in -------------
What are the differences between the plum pudding model, nuclear model and the atomic model
The Plum Pudding Model visualised the atom as a glob of positive charge with electrons embedded in it. Rutherford's Nuclear Model highlighted the nucleus and suggested electrons orbit in space around it. The modern Atomic Model is based on quantum mechanics and proposes fixed energy levels around the nucleus where electrons reside.
Explanation:The Plum Pudding Model proposed by J.J. Thomson in 1904 visualised the atom as a positively charged cloud (the 'pudding') with negatively charged electrons (the 'plums') embedded in it. This model was later debunked.
In contrast, Rutherford's Nuclear Model proposed in 1911 suggested that the atom consists of a tiny, dense, positively charged nucleus surrounded by negatively charged electrons moving in mostly empty space. This model highlighted the atom's nuclear structure but failed to explain how electrons maintained their orbits.
The contemporary Atomic Model, often referred to as the quantum mechanical model, goes beyond the Nuclear Model. It suggests that electrons reside in defined energy levels around the nucleus (in a 'cloud') but their exact location within these levels cannot be pinpointed.
Learn more about Atomic Models here:https://brainly.com/question/32840535
#SPJ2
A physician has a patient that he believes has had foul play. What type of autopsy would the physician request?
Question 15 options:
Medical- legal autopsy
Investigation Autopsy
Medical Autopsy
Evidence Autopsy
If a physician believes that foul play may have been involved in a patient's death, they would typically request a medical-legal autopsy.
Explanation:If a physician believes that foul play may have been involved in a patient's death, they would typically request a medical-legal autopsy. This type of autopsy is performed to investigate the cause and manner of death, with a focus on documenting any forensic evidence that could be relevant to a legal investigation. Medical-legal autopsies differ from regular medical autopsies because they involve more detailed examination and documentation to determine if any crimes were committed.
Learn more about Medical-legal autopsy here:https://brainly.com/question/6460613
#SPJ12
A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 3.8 cm . its mass is 1.3 kg . calculate the density of the metal.express your answer to two significant figures and include the appropriate units.
What's the difference between inplicit and explicit solvent?
How do mass and speed affect kinetic energy?
A conversion factor is a ratio with a value of
A: one
B: two
C: five
D: ten
Answer:
A) one
Explanation:
for anyone else who looks for this question, the answer is one. stated in the book itself, "a conversion factor is a ratio that has a value of one."
In large urban areas people know how to establish private zones of solitude even in crowds. Urban golffman analyse this as an instance of socialization called
What is the density of lead (in g/cm3) if a rectangular bar measuring 0.50 cm in height, 1.55 cm in width, and 25.00 cm in length has a mass of 218.9 g ? express your answer using two significant figures?
Answer:
Explanation:
density is defined as the measure of the mass of a matter per unit volume. it describes the sopace occupied by a substance relative to its volume.
Density = mass ÷ volume
ρ = m ÷ v
Volume = length × width × height
Volume of lead bar = l × w × h
V = 25 × 1.55 × 0.5
V = 19.375cm³
mass of bar = 218.9g
ρ = 218.9 ÷ 19.375
ρ = 11.2980g/cm³
ρ = 11g/cm³
How do rocks along the central valley of the mid oceanic ridges provide evidence of seafloor spreading?
If you're going 80 mph how long does it take to 80 miles
George's highest target heart rate is 170. Yesterday on the stair stepper machine, his heart rate went to 172. What should he do the next time he uses this machine to get the most effective workout?
It is not very difficult to accelerate an electron to a speed that is 99.5% of the speed of light, because it has such a very small mass. what is the ratio of the kinetic energy k to the rest energy mc2 in this case? in the definition of what we mean by kinetic energy (k = e - mc2), you must use the full relativistic formula for e, because v/c is not small compared to 1.
The kinetic energy (K) to rest energy (mc2) ratio for an electron traveling at 99.5% of the speed of light is approximately 150%. This is determined using the full relativistic formula, as classical mechanics significantly underestimates the required energy.
Explanation:When an electron is accelerated to a speed that is 99.5% of the speed of light, relativistic effects become significant. The rest mass energy of an electron is 0.511 MeV, and at this high velocity, the kinetic energy is no longer accurately described by classical physics, and the full relativistic energy formula must be utilized. The relativistic kinetic energy of the electron is significantly greater than the classical value. If the classical kinetic energy is denoted as KEclass and the relativistic kinetic energy is denoted as KErel, the ratio KErel/KEclass is approximately 12.4. This highlights the substantial energy needed to accelerate a mass close to the speed of light, much more than classical physics would predict.
The ratio of the kinetic energy (K) to the rest energy (mc2) can be calculated using the relativistic energy equation E2 = (pc)2 + (mc2)2, where E is the total energy and p is the momentum. For an electron at 99.5% of the speed of light, this ratio is approximately 150%, meaning the kinetic energy is about one and a half times the rest mass energy. Therefore, for an electron moving at such high velocities, enormously high energies are required as indicated by currents accelerators like SLAC.
For the chemical reaction H2 + CO2 → H2O + CO, the energy contained in the reactants is 394 kJ, and the energy contained in the products is 352 kJ, assuming 1 mol of each substance is present. Which of the following statements is true?
C. 42 kJ is absorbed, and the reaction is endothermic. Because the amount of energy in the products is less than that of the reactants, the reaction is endothermic. Endothermic reactions use up, or absorb energy.
What prevents geologists from exploring earth's interior?
Investigators studied the effect of temperature on the rate of biological enzyme action. The experimental data is summarized in the graph. The investigators concluded that the enzyme works best at human body temperature.
What part of the data validates their conclusion?
The graph peaks at 37°C and dips beyond this point.
B) The graph shows an exponential rise in reaction velocity.
C) The graph shows that the reaction is complete at 60°C.
D) The reaction is seen for temperatures between 0°C and 60°C.
Answer:
The graph peaks at 37°C and dips beyond this point.
Explanation:
Imagine that temperature is on the x axis and rate of biological enzyme action is on y axis. Now as the temperature changes it is seen that the rate of biological enzyme action increases and is maximum at body temperature which is 37°C. Increasing the temperature does not change the rate of biological enzyme action. Which means there is no peak beyond 37°C.