Classify Use periodic table to classify the elements potassium (K) ,Bromine (Br) and argon, (Ar) according to know likely their atoms are to do the following
A-Lose electrons to form positive ions
B-Gain electrons to form negative ions
C-Neither gain or lose electrons
Potassium is likely to lose electrons to form positive ions, Bromine is likely to gain electrons to form negative ions, and Argon is neither likely to gain or lose electrons.
Explanation:Potassium (K) is in Group 1 of the periodic table, which means it has one valence electron. It is highly likely to lose this electron to form a positive ion (K+).
Bromine (Br) is in Group 17, so it has seven valence electrons. It is highly likely to gain one electron to complete its octet and form a negative ion (Br-).
Argon (Ar) is in Group 18, a group of noble gases that have a full octet of valence electrons. These elements are stable and generally do not gain or lose electrons.
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Which BEST describes the difference between speed and velocity? A) Velocity is instantaneous. B) Speed is a vector quantity. C) Speed includes rate of change and direction. D) Velocity includes rate of change and direction.
Answer:
Option (d) is correct.
Explanation:
Speed is defined as the ratio of distance traveled to the time taken.
As distance is scalar quantity, time is also scalar, so the speed is a scalar quantity.
Velocity is defined as the ratio of change in displacement to the time take.
Here displacement is a vector quantity, so velocity is a vector quantity.
So, velocity includes the rate of change of displacement and the direction.
Roseanne heated a solution in a beaker as part of a laboratory experiment on energy transfer. After a while, she noticed the liquid solution began to circulate within the beaker. What process involving heat transfer did Roseanne observe inside the beaker?
All of the following are possible sources of error in a scientific investigation except for
A. Measuring the change in temperature incorrectly
B. Manipulating the wrong variables in the experiment
C. Reviewing previously published studies before the experiment
D. Completing only one trial in the experiment
Your answer would be C my friend
List at least three things that can happen as plate spread apart.
b. Place these events in order by numbering them
Which of the following is NOT a developer of an atomic model?
A- Dalton
B- Planck
C- Rutherford
what are some non examples of proton
1. A student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. In this diagram, The lightbulb would be
a. an insulator
b. on
c. disconnected
d. off
2. The force of gravity on an object on the surface of Mars is less than the force of gravity on an identical object on the surface of earth. Which of the following is a example why this is true?
a. Mars has more volume than earth
b. Earth has more volume then mars
c. Mars has less mass than earth
d. Earth has less mass then mars
What is one difference between a window, a leaf, and a metal spoon?
find the pressure exerted by a 3000 N crate that has an area of 2m squared
what organism has ribosomes,mitochondria,and lysosomes but does not have a cell wall
a 6 pack of undershirts cost 13.98. This is 3.96 less than the cost of buyng 6 individual shirts if each undershirt cost the same amount , how much does each undershirt cost when purchased individually.
Can you tell me at least three states of matter that are fluids?
who participates in sport more? women or men and why?
You exert a force of 15 newtons while you move a rock 2 meters. How much work did you perform?
a) 17 n-m
b) 30 meters
c) 7 1/2 newtons
d) 30 n-m
Sort the energy spectrum from shortest to longest wavelength (short at top, long at bottom).
light
heat
radio
x-rays
cosmic
Answer:
Cosmic
x-rays
light
heat
radio
Table salt (NaCl) dissolves in water. What happens when saltwater is made? A) The salt crystals sink to the bottom of the water. B) The salt crystals split into ions. C) The salt crystals float to the top of the water. D) The water molecules split into ions
red fox
sage shrub
fence lizard
grasshopper
If these organisms were arranged in a food pyramid, which organism would have the LEAST amount of total energy available?
A. red fox
B. sage shrub
C. grasshopper
D. fence lizard
Answer:
The answer is A: red fox
Explanation:
suppose you want to build a house on the edge of a hill that overlooks a deep valley. what measures could you take to be sure your home will not have problems due to weathering or erosion
All scavengers are consumers but not all consumers are scavengers true or false explain your answer.
what happens when you shuffle your feet across a carpet
Explain how the first three steps of scientific inquiry are related.
Answer:
Explanation:
The scientific inquiry is a fact finding inquiry for determining the cause or occurrence of the natural processes, events or phenomena. The three steps of the scientific inquiry are related such a making a background research for the desired topic, observation of the natural process, and making hypothesis based on the observation. These three steps are basic for conducting a research and for finding the facts associated with the research.
Write the law of conservation of energy. How does it apply to eating and exercising?
The law of conservation of energy asserts that energy cannot be created or destroyed, only transformed. This principle applies to eating and exercising by showing that food energy is converted into physical activity and stored fat, highlighting the importance of balancing energy intake with expenditure to manage weight.
Explanation:Law of Conservation of EnergyThe law of conservation of energy states that energy can be neither created nor destroyed, only transferred or transformed from one form to another. In the context of eating and exercising, this principle indicates that the chemical energy from food is converted into various forms such as work (physical activity), thermal energy (heat), and chemical energy stored in body fat. Diets and exercise plans making extraordinary claims should be evaluated for their truthfulness based on this law. If a diet or exercise plan claims to 'destroy' energy or cause weight loss without considering energy intake and expenditure, it is likely not aligned with this fundamental law.
When discussing energy conservation, we can look at our own bodies as energy systems that convert the energy from food into necessary bodily functions and stored energy. If more energy is consumed than what is used for activity and maintaining body temperature, the excess energy is stored as fat. Conversely, if we consume less energy than we use, we tap into these fat reserves to maintain energy balance. Therefore, distinguishing between possible and impossible outcomes when considering exercise and dietary choices becomes clearer under the lens of energy conservation.
To perform a laboratory test of energy conservation, one might set up an experiment to measure the energy input and output in a system to confirm that, despite transformations, the total amount of available energy remains the same. This idea also broadly connects to understanding various forms of energy, such as calories in food, batteries, and heat, illustrating the interconnectedness of physical phenomena.
to keepa sled accerlation downhill the force of gravity must be greater that the ___________ force
To keep a sled accelerating downhill, the force of gravity must be greater than the frictional force.
When analyzing the motion of a sled sliding downhill, it's important to understand the forces acting on it and how they contribute to acceleration. Here’s a detailed explanation:
Forces Acting on the Sled
1. Force of Gravity:
- Gravity: The force of gravity acts vertically downward with a magnitude of ( mg ), where ( m ) is the mass of the sled and ( g ) is the acceleration due to gravity (approximately [tex]\( 9.81 \, \text{m/s}^2 \))[/tex].
- Component Parallel to the Slope: When the sled is on a slope, only a component of the gravitational force contributes to the sled's motion down the slope. This component is calculated as [tex]\( mg \sin(\theta) \), where \( \theta \)[/tex] is the angle of the slope. This component pulls the sled downhill.
2. Frictional Force:
- Friction: Friction opposes the motion of the sled. On a slope, this force acts up the slope and is given by [tex]\( f_{\text{friction}} = \mu N \)[/tex], where ( mu ) is the coefficient of friction and ( N ) is the normal force.
- Normal Force: The normal force is the component of the gravitational force perpendicular to the slope. It is given by [tex]\( N = mg \cos(\theta) \).[/tex]
Conditions for Acceleration
For the sled to accelerate downhill, the net force acting in the direction of the slope must be positive. This requires:
[tex]\[ F_{\text{net}} = F_{\text{gravity parallel}} - F_{\text{friction}} \][/tex]Where:
- [tex]\( F_{\text{gravity parallel}} = mg \sin(\theta) \)[/tex]
- [tex]\( F_{\text{friction}} = \mu mg \cos(\theta) \)[/tex]
Thus:
[tex]\[ F_{\text{net}} = mg \sin(\theta) - \mu mg \cos(\theta) \][/tex]For the sled to accelerate downhill:
[tex]\[ mg \sin(\theta) > \mu mg \cos(\theta) \][/tex]Simplifying this, we get:
[tex]\[ \sin(\theta) > \mu \cos(\theta) \][/tex]In other words, the force of gravity acting parallel to the slope must be greater than the frictional force resisting the motion. If this condition is met, the sled will accelerate downhill. If not, the sled might move at a constant speed or even slide up the slope if the frictional force is greater than or equal to the component of gravity pulling it down.
Which BEST describes the difference between speed and velocity?
A) Velocity is instantaneous.
B) Speed is a vector quantity.
C) Speed includes rate of change and direction.
D) Velocity includes rate of change and direction.
Answer : The correct option is, (D) Velocity includes rate of change and direction.
Explanation :
Speed : Speed is defined as the distance traveled by an object with respect to the time taken. It is a scalar quantity that means it tell us about the magnitude of an object not direction.
Velocity : Velocity is defined as the rate of change of position of an object with respect to the time. It is a vector quantity that means it tell us about the magnitude and direction of an object.
The only difference between the speed and the velocity is that the velocity tell us about magnitude and direction but speed tell us about magnitude only.
Hence, the correct option is, (D) Velocity includes rate of change and direction.
Speed is a scalar quantity that only considers the magnitude of movement, while velocity is a vector quantity that includes both the magnitude and direction of movement.
Explanation:D) Velocity includes rate of change and direction.
Speed and velocity are both terms used to describe how fast an object is moving. However, there is a key difference between the two. Speed is a scalar quantity, meaning it only considers the magnitude or size of the movement. Velocity, on the other hand, is a vector quantity. This means it includes both the magnitude and direction of the movement.
For example, if a car is traveling at a speed of 60 miles per hour, that only tells us how fast it is going. However, if we say the car is traveling at a velocity of 60 miles per hour northeast, that tells us both the speed and the direction.
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Can someone PLEASE HELP ME!!!!! A chemical sequence of DNA, or ____, determines a trait of an organism.
John and Daniel are playing tug-of-war together. John is exerting 10 N of force. Daniel is exerting 12 N of force. What is their net force
an unbalanced force moving everyone in Daniel and Maria's direction
compare the life cycles of flower less seed plant and flowering seed plants
The life cycles of gymnosperms and angiosperms include seed germination and development stages; however, angiosperms are unique in their production of flowers and fruit-enclosed seeds, which distinguishes them from gymnosperms with exposed seeds on cones.
The life cycles of both non-flowering seed plants, like gymnosperms, and flowering seed plants, known as angiosperms, are characterized by a sequence of developmental stages from seed germination to the production of new seeds. However, there are fundamental differences between these two groups of plants. In the life cycle of a gymnosperm, seeds are not enclosed within a fruit but are often found on the scales of cones. In contrast, angiosperms produce seeds within a fruit, which develops from the flower.
The flower is the reproductive structure that typically includes petals, stamens, pistils, and is responsible for the sexual reproduction of these plants. Angiosperms are divided into two main groups: monocots and dicots. Basal angiosperms differ from other flowering plants in having traits that are more ancestral or less derived. The life cycle of an angiosperm involves alternating generations, with the sporophyte phase being the dominant generation.
The process of seed development in angiosperms is often characterized by the acronym RRAPP, signifying Reduction of the gametophyte, Retention of the gametophyte within the tissues of the parent plant, Arrested development of the seed until favorable conditions, Provisioning of the embryo with nutritive tissue, and Packaging of the seed with a protective coat.
Summarily, the distinctive flower structure and the protected seed development are key differentiators of angiosperms when compared with gymnosperms. Both life cycles show reduction in the haploid stage and growing complexity over time, but angiosperms have advanced further by incorporating flowers and encased seeds into their reproductive strategy.
what is friction. what does friction do as an ice skater slide across the ice?
Friction is a force that opposes motion between surfaces in contact. When an ice skater slides across the ice, friction between the skates and the ice slows them down and eventually brings them to a stop.
Explanation:Friction is a force that opposes relative motion between surfaces in contact. When an ice skater slides across the ice, friction between the skates and the ice slows down the skater and eventually brings them to a stop. The ice skates exert a force on the ice, and the ice exerts an equal and opposite force on the skates, creating friction.
which of the following accurately shows how to calculate the weight of a 20kg object
20kgx9.8m/s
20kg/mass of the earth
20kg/9.8m/s
20kgxmass of the earth
Answer:
[tex]\Huge \boxed{\mathrm{20\ kg \cdot 9.8\ m/s^2}}[/tex]
Explanation:
[tex]\sf Weight \ (N)= mass \ (kg) \times acceleration \ of \ gravity \ (m/s^2)[/tex]
[tex]W=mg[/tex]
The mass of the object is 20 kg.
The acceleration of gravity is approximately 10 m/s².
[tex]W=20 \times 10[/tex]
[tex]W=200[/tex]
The weight of the object is 200 N.