6 A small rock is thrown vertically upward with a speed of 14.0 m/s from the edge of the roof of a 30.0 m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected.
A)What is the speed of the rock just before it hits the street?
B)How much time elapses from when the rock is thrown until it hits the street?
In a hospital setting, which of the following presents the possibility of being the source of an arc flash?
A student pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. She then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. The student performs the experiment one more time but this time she stirs the mixture rapidly.
In order to get the best results, the student should:
What is meant by the terms composition and structure when referring to matter?
Does the force of kinetic friction depend on the weight of the block? explain.
The force of kinetic friction is determined by surface properties and the normal force, not the weight of the object. Thus, objects with different weights experience the same kinetic friction on the same surface.
The force of kinetic friction does not depend on the weight of the block. Kinetic friction is the force that opposes the relative motion of two surfaces in contact when they are sliding past each other. It is determined by the nature of the surfaces and the normal force, which is the force exerted by a surface to support the weight of an object resting on it.
The weight of an object (or the force of gravity acting on it) affects the normal force, but it does not directly impact the coefficient of kinetic friction between the surfaces. The coefficient of kinetic friction remains constant for a given pair of materials, regardless of the weight of the object.
In simpler terms, if you have two objects made of the same material and they are sliding on the same surface, the force of kinetic friction will be the same for both objects, even if they have different weights. This is because the frictional force depends on the properties of the surfaces in contact, not the mass or weight of the objects involved.
To learn more about kinetic friction
https://brainly.com/question/20241845
#SPJ12
Wich element is likely to be the most reactive
Answer:
Fluorine
Explanation:
Fluorine is the most reactive and most electronegative element in the periodic table. It can react with glass so it is impossible to find fluorine in its pure form. It exists in gaseous form even at room temperature and it is the most oxidizing agent. It is a non metal, in metals cesium is the most reactive.
The element that is likely to be the most reactive is hydrogen. The correct option is A.
The most reactive element of the ones listed is probably hydrogen (H). It is extremely reactive due to the fact that its outermost shell contains just one electron.
Oxygen, halogens, and metals are just a few of the substances that hydrogen can interact with quickly.
Covalent bonds can be formed with nonmetals like oxygen, resulting in substances like water. In redox reactions, such as the synthesis of acids and bases, hydrogen also takes part.
Its low atomic mass, which permits quicker diffusion and more frequent collisions with other atoms, further increases its reactivity.
Overall, the electrical structure of hydrogen and its capacity to create stable bonds with other elements are what cause it to be so reactive.
Thus, the correct option is A.
For more details regarding reactive element, visit:
https://brainly.com/question/13769935
#SPJ6
Your question seems incomplete, the probable complete question is:
Which of the following elements is likely to be the most reactive?
A) Hydrogen (H)
B) Oxygen (O)
C) Neon (Ne)
D) Argon (Ar)
A particle moving uniformly along the x axis is located at 13.4 m at 1.72 s and at 3.13 m at 4.6 s. what is its average velocity during this time interval? answer in units of m/s.
The average velocity of a particle moving uniformly along an axis can be found using the formula v = Δx/ Δt where Δx is the change in displacement and Δt is the change in time. In this case, the initial position and time are subtracted from the final position and time to find these changes, and the answer is negative, indicating motion in the negative x-direction.
Explanation:The average velocity of a particle moving uniformly along the x-axis can be determined using the formula for average velocity, which is the change in displacement divided by the change in time. In this case, the initial position of the particle is x1 = 13.4 m at time t1 = 1.72 s, and the final position is x2 = 3.13 m at time t2 = 4.6 s.
Subtract the initial position from the final position to get the change in displacement (Δx = x2 - x1), and subtract the initial time from the final time to get the change in time (Δt = t2 - t1).
A negative answer implies motion in the negative x-direction. The average velocity (v) is then given by the formula v = Δx/Δt.
Learn more about Average Velocity here:https://brainly.com/question/1375440
#SPJ3
walt ran 5 kilometers in 25 minutes, going eastward. What was his average velocity?
If walt ran 5 kilometers in 25 minutes, going eastward. His average velocity is: 0.2 kilometers per minute.
What is the average velocity?
To determine Walt's average velocity divide the distance traveled by the time it took him.
We can use the formula:
Average velocity = Distance / Time
Plugging in the values:
Average velocity = 5 kilometers / 25 minutes
Average velocity = 0.2 kilometers per minute
Therefore Walt's average velocity is 0.2 kilometers per minute, meaning that he was running at a speed of 0.2 kilometers every minute in the eastward direction.
"what shape are the pebble-sized particles that make up the rock?"
The position function x(t) of a particle moving along an x axis is x 4.0 6.0t 2 , with x in meters and t in seconds. (a) at what time and (b) where does the particle (momentarily) stop? at what (c) negative time and (d) positive time does the particle pass through the origin?
The particle crosses the origin at t = 2.0 seconds, and the displacement from t = 3.0 s to t = 6.0 s is -6 meters.
The position function of a particle moving along an x-axis is described as x(t) = 4.0 - 2.0t meters. To determine (a) when the particle crosses the origin, we set the position function equal to zero (x(t) = 0) and solve for t, which gives us t = 2.0 seconds. For part (b), the displacement of the particle between t = 3.0 s and t = 6.0 s is calculated by finding the difference in position at these two times: x(6.0) - x(3.0), which results in a displacement of -6 meters.
True or False A scientific law only states that an event occurs?
True
A scientific law only states that an event occurs.
Hope this helps!
A primitive air-conditioning unit for the use in places where electrical power is unavailable can be made by hanging up strips of linen soaked in water. the evaporation of the water cools the air. calculate the heat required to evaporate 5.00 l of water at 0c
Final answer:
The heat required to evaporate 5.00 liters of water at 0°C is 11300 kJ, calculated by multiplying the mass of the water (5.00 kg) by the heat of vaporization (2260 kJ/kg).
Explanation:
The student is asking about the heat required to evaporate 5.00 liters of water at 0°C. This is a question related to thermochemistry, specifically the heat of vaporization of water. The heat of vaporization is the amount of energy required for liquid water to turn into water vapor. To calculate the heat required, we use the formula:
Q = m × hv
where Q is the heat required, m is the mass of water, and hv is the heat of vaporization. The heat of vaporization for water is approximately 2260 kJ/kg at 0°C.
First, we convert 5.00 liters to kilograms as the density of water is about 1 kg/L, which makes the mass 5.00 kg. Then we calculate the heat required:
Q = 5.00 kg × 2260 kJ/kg = 11300 kJ
Therefore, the heat required to evaporate 5.00 liters of water at 0°C is 11300 kJ.
which of the following professionals would most likely be called upon to treat a person suffering from a dangerous level of schizophrenia
What units do chemists normally use for density of liquids and solids? for gas density? explain the differences?
We can define density as per unit volume.
The SI unit to measure the density of solid, liquid and gas is kilogram per cubic metre (kg/m3) and in the centimetre–gram–second system of units (cgs unit) is gram per cubic centimetre (g/cm3). Gas density is very dependent of pressure and temperature whereas the density of solids and liquids is not so dependent, that is why the gas density is given at a standard temperature and pressure.
Chemists typically use g/mL or g/cm³ for liquids and solids, and g/L for gases. Differences arise due to the varying densities and volumes of these states of matter.
Chemists use different units for density based on the state of matter being measured. For liquids and solids, the density is usually expressed in grams per milliliter (g/mL) or grams per cubic centimeter (g/cm³). This is because liquids and solids generally have higher densities and smaller volumes compared to gases, making these units convenient for laboratory measurements and calculations.
For gases, the density is typically expressed in grams per liter (g/L). Gases have much lower densities and occupy larger volumes compared to liquids and solids, so g/L is more appropriate. The larger unit (liter) helps to manage the lower mass of gases, ensuring the numerical values are easy to work with.
The choice of units helps chemists maintain consistency and accuracy when measuring and comparing densities across different substances and states of matter. Using units that reflect the typical scales of measurement for each state ensures that the values are neither too large nor too small, facilitating easier interpretation and communication of data.
What is another name for the introitus? psych 230?
The introitus, or vaginal opening, is the external entrance to the vagina in the female reproductive system.
The term "introitus" specifically refers to an opening or entrance into a canal or cavity of the body. In the context of human anatomy, particularly in discussions of human sexuality and reproduction, another name for the «introitus» is the vaginal opening. This is the external opening to the vagina, which is part of the female reproductive system.
What is her mass on the moon, where g=1.62m/s2 ?
The mass of an object remains constant, in any location. As such, a person's mass on the Moon is the same as their mass on Earth. However, their weight would be approximately 1/6th of what it is on Earth, due to the Moon's lower gravity.
Explanation:The mass of an object remains the same regardless of location - it is a fixed measure of the amount of matter within an object. The force of gravity does change depending on location, and as such, the weight of an object can vary. On the Moon, for example, the value of 'g' (the acceleration due to gravity) is 1.62 m/s², which is about 1/6 of the Earth's gravity. Therefore, if you weigh 60 kg on Earth, you would still possess that same mass on the Moon. However, your weight on the Moon would be much less due to the lower gravity.
https://brainly.com/question/28636077
#SPJ11
A vector has an x component of -27.5 units and a y component of 43.0 units. find the magnitude and direction of this vector.
The magnitude of the vector is approximately 50.5 units and its direction is around 122.6 degrees with respect to the positive x-axis, which lies in the second quadrant.
To find the magnitude and direction of a vector with an x component of -27.5 units and a y component of 43.0 units, we can use the Pythagorean theorem and trigonometry. The magnitude of the vector is calculated using the formula \( \sqrt{x^2 + y^2} \). Plugging in the values, the magnitude (R) is \( \sqrt{(-27.5)^2 + (43.0)^2} \) which equals approximately 50.5 units. To determine the direction, we calculate the angle (θ) with respect to the positive x-axis using the arctangent function \( \tan^{-1}(\frac{y}{x}) \). Since the x-component is negative and the y-component is positive, the vector lies in the second quadrant. Thus, the angle from the positive x-axis is \( \tan^{-1}(\frac{43.0}{-27.5}) \) plus 180 degrees (to adjust for the quadrant), which gives us an angle of approximately 122.6 degrees.
What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 500 nm ? the index of refraction of the film is 1.32, and there is air on both sides of the film?
According to Plato what is the highest principle in reality
A sailboat is heading directly north at a speed of 20 knots (1 knot 50.514 m/s). the wind is blowing toward the east with a speed of 17 knots. (a) determine the magnitude and direction of the wind velocity as measured on the boat. (b) what is the component of the wind velocity in the direction parallel to the motion of the boat?
A 2300 kg truck has put its front bumper against the rear bumper of a 2500 kg suv to give it a push. with the engine at full power and good tires on good pavement, the maximum forward force on the truck is 18,000 n.
Answer:
Acceleration = a = 3.75 m/s^2
Explanation:
Mass of truck1 = m1 = 2300 kg
Mass of truck2 = m2 = 2500 kg
Total mass = m = m1 + m2 = 2300 + 2500 = 4800 kg
Force exerted by truck1 = F = 18000 N
As both trucks are joint together so, behaving as single object. The acceleration can be found by Newton’s second law of motion.
F = ma
a = F/m = 18000/4800
a = 3.75 m/s^2
What is the setting of the story in "the pedestrian"?
a.a space station orbiting mars
b.a deserted neighborhood street
c.a lonely road in the countryside
d.a large metropolis?
Answer:
b.a deserted neighborhood street
Explanation:
ap3x
The setting of the story in "the pedestrian" is a large metropolis. The correct option is D.
"The Pedestrian" is a short story by Ray Bradbury that was first published in 1951. The story is set in the future in the year 2053 in a large metropolis where people spend their evenings indoors watching television or communicating through advanced technology.
The main character, Leonard Mead, is an exception to this pattern. He enjoys taking long walks through the city streets at night, something that is seen as strange and suspicious by the society around him. One evening, he is stopped by a police car and questioned about his activities. The police officers are suspicious of him and don't understand why he would want to walk when he could stay inside and be entertained.
After a brief conversation, the police let Leonard go and he continues his walk. However, he soon realizes that he is the only person outside in the entire city. He reflects on the society he lives in and how it has become so obsessed with technology that people have lost the ability to appreciate the simple pleasures of life. As he continues his walk, he is suddenly surrounded by a bright light and taken away by the police, who see his activities as a threat to society.
The story is a critique of the growing influence of technology and its impact on human interaction and personal freedoms. It highlights the danger of becoming too dependent on technology and losing sight of the things that truly make life worth living.
To learn more about the heliocentric model of the Solar System click:
https://brainly.com/question/12075871
#SPJ7
A 1100kg car pulls a boat on a trailer. (a) what total force resists the motion of the car, boat,and trailer, if the car exerts a 1900n force on the road and produces an acceleration of 0.550 m/s2? the mass of the boat plus trailer trailer is 700kg. (b) what is the force in the hitch betweenthe car and the trailer if 80% of the resisting forces are experienced by the boat and trailer?
A laser pulse with wavelength 520 nm contains 4.40 mj of energy. how many photons are in the laser pulse?
To calculate the number of photons in a laser pulse, use the formula energy per photon = Planck's constant x speed of light / wavelength. Plugging in the values and dividing the total energy by the energy per photon, we find that the laser pulse contains approximately 2.65 x 10^19 photons.
Explanation:To calculate the number of photons in a laser pulse, we can use the formula:
energy per photon = Planck's constant x speed of light / wavelength
In this case, the energy per photon is 4.40 mJ = 4.40 x 10-3 J, the wavelength is 520 nm = 520 x 10-9 m, Planck's constant is 6.63 x 10-34 J·s, and the speed of light is 3.00 x 108 m/s. Plugging these values into the formula, we can find the energy per photon. Then, we can divide the total energy of the laser pulse (4.40 mJ) by the energy per photon to calculate the number of photons in the pulse.
The number of photons in the laser pulse is approximately 2.65 x 1019 photons.
Learn more about Number of Photons here:https://brainly.com/question/35066456
#SPJ12
The expression CaCO3 → CaO + CO2 is an example of a reactant. product. chemical equation. chemical progression.
By definition, the expression CaCO₃ → CaO + CO₂ is an example of a chemical equation.
Definition of chemical reactionA chemical reaction is any process in which at least the atoms, molecules, or ions of one substance are changed into atoms, molecules, or ions of another chemical substance.
Definition of chemical equationA chemical equation is a symbolic description used to describe the identities and relative quantities of the reactants and products involved in a chemical reaction.
The information contained in the chemical equation allows us to determine the substances that are transformed or modified in a reaction, called reactants or reagents, and the new substances that originate in a chemical reaction, called products.
In order to represent what happens in a chemical reaction by means of an equation, it must comply with the Law of conservation of matter and with the Law of conservation of energy. That is, the equation must indicate that the number of atoms of the reactants and products is equal on both sides of the reaction and that the charges are also equal. In other words, you must have a balanced equation.
SummaryFinally, the expression CaCO₃ → CaO + CO₂ is an example of a chemical equation.
Learn more about chemical equation:
https://brainly.com/question/20780772
https://brainly.com/question/13454144
https://brainly.com/question/19998775
https://brainly.com/question/6976143
https://brainly.com/question/14360328
Answer:
chemical equation
Explanation:
Describing Chemical Reactions quiz on edg
People who study the effects of human activities on earth land air water and living Thing are
Answer:
People who study the effects of human activities on earth land air water and living thing are Environmental scientist
If you drop a ball, and then one second later drop a ball identical in mass, size and shape, what happens to the distance between them as they fall?
Final answer:
As two identical balls are dropped with a one-second interval, the distance between them increases because the first ball accelerates for a longer time and achieves a higher velocity than the second ball at the instant it is dropped.
Explanation:
The question involves the concepts of gravity and acceleration as related to two identical falling objects. When a ball is dropped and then a second identical ball is dropped one second later, the distance between them increases as they fall. This is because the first ball has already been accelerating due to gravity for one second longer than the second ball, and thus it has a higher velocity at the moment the second ball is released. Therefore, the first ball continues to pull away from the second ball as they both fall towards the Earth.
If your front lawn is 17.0 feet wide and 20.0 feet long,and each square foot of lawn accumulates 1050 new snow flakes every minute, how much snow in kilograms accumulates on your lawn per hour? assume an average snow flake has a mass of 1.90mg.
Explain the relationship between resistance and the velocity of shortening.
Which of the following buildings would be least likely to be damage after a very large earthquake
Soft-story buildings are least likely to withstand large earthquakes compared to well-designed structures that comply with modern building codes. Building codes are meant to reduce damage through various levels of seismic activity, but they only apply to new or significantly renovated structures. The type of ground and construction materials also significantly impacts a building's earthquake resilience.
Among various building types, soft-story buildings are least likely to withstand a very large earthquake due to their vulnerability to horizontal forces. Such structures, which include two- or three-car garages with a living space above, can fail catastrophically during an earthquake because of less bracing in the open areas compared to standard walls. In contrast, well-designed buildings that adhere to modern building codes and consider earthquake resilience are more likely to sustain only minor damage, even during severe shaking. Understanding building performance during earthquakes is essential, especially in regions where adherence to building codes might be poor and materials used might be inadequate, leading to increased structural vulnerability.
Building codes play a crucial role in dictating how well a structure can survive an earthquake. The codes are designed to ensure that buildings resist minor ground motion without damage, moderate shaking without structural damage, and major motion with an intensity equivalent to the region's maximum considered earthquake without collapse, despite possible structural damage. However, the effectiveness of these codes is limited to new constructions or major renovations. Buildings built before the establishment of stringent earthquake-related standards, such as old unreinforced masonry buildings or non-ductile reinforced concrete frames, tend to suffer the most damage. Moreover, buildings constructed on unconsolidated sediments are likely to experience more severe earthquake damage than those on solid rock due to the amplification of seismic waves. In addition to the type of ground, the materials and construction methods used also determine a building's seismic performance. Brittle structures like unreinforced masonry and nonductile concrete frames perform poorly during earthquakes due to their susceptibility to sheer and collapse.