What is the kinetic energy at maximum height when a stone of 5g is vertically thrown up at a velocity of 20m/s
Answers
Kinetic energy refers to the energy that an object possesses as a result of its motion. It is defined as half the product of an object’s mass and the square of its velocity.
Kinetic energy (K.E) = 1/2mv2
The mass (m) of the stone is 5g (0.005kg).
The initial velocity (u) of the stone is 20m/s.
At the maximum height, the stone stops momentarily.
This means that its final velocity (v) is 0m/s.
Using the formula above:
K.E at maximum height = 1/2 x 0.005 x 20² = 0.5Joule (J)
Therefore, the kinetic energy at maximum height when a stone of 5g is vertically thrown up at a velocity of 20m/s is 0.5Joule (J).
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Related Questions
why is velocity called vector quantity while speed is a scalar quantity
Answers
Answer:
velocity is the rate of change of distance moved with a time in a specific direction. While speed is the rate if distance with time in no specific direction
3.
If you are part of a center or network, you can use program-level data to
A. change the way you record and maintain information.
B. identify professional development needs.
C. improve the management systems to support child learning.
D. change the way you speak with families
Answers
Answer:
A
Explanation:
Answer: A
Explanation:
why do think chopping of wood is a physical change but burning of wood is a chemical change
Answers
Answer: Burning of wood is a chemical change while cutting of wood is a physical change because during burning, new substances are formed. After burning, we cannot get original substance, (i.e. wood) back. Cutting of wood into small pieces is a physical change because no new substance is formed.
A box is at rest at the top of a frictionless inclined plane. As the box slides down the ramp where along the ramp would the box have half of its maximum kinetic energy?
Answers
Answer:
I would say near the end of the slide.
which assumption about level of measurement is made for the chi square test?
Answers
The chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level of measurement.
In statistics, the level of measurement refers to the nature and properties of the data being collected. There are four levels of measurement: nominal, ordinal, interval, and ratio. Nominal and ordinal levels are considered categorical, while interval and ratio levels are considered numerical. The chi-square test is specifically designed for analyzing categorical data, where the observations can be classified into distinct categories or groups. It is used to determine whether there is a significant association or relationship between two categorical variables.
The test calculates the difference between the observed frequencies and the expected frequencies under the assumption of independence between the variables. It compares the observed and expected frequencies using a chi-square statistic and determines the p-value to assess the statistical significance of the association. Therefore, the chi-square test assumes that the variables being analyzed are measured at a nominal or ordinal level because it deals with categorical data and evaluates the relationship between different categories or groups.
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what is Not an example of an machanical wave
Answers
Answer:
Definitely without a doubt a pumpkin
A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s
What is the biker's momentum?
Answers
Answer:
\(375\ \text{kg m/s}\)
Explanation:
\(m\) = Mass of biker = \(75\ \text{kg}\)
\(v\) = Velocity of bike = \(5\ \text{m/s}\)
Momentum is given by the product of mass and velocity so,
\(p=mv\)
\(\Rightarrow p=75\times 5\)
\(\Rightarrow p=375\ \text{kg m/s}\)
The momentum of the biker is \(375\ \text{kg m/s}\).
The biker's momentum will be "375 kg m/s".
Momentum and VelocityThe proportion or resultant of a subatomic particle mass as well as the speed. Momentum would be a vector quantity, which means it does have a magnitude and therefore an orientation or directions.
According to the question,
Biker's mass, m = 75 kg
Biker's velocity, v = 5 m/s
We know the relation,
Momentum = Mass × Velocity
or,
→ p = mv
By substituting the values, we get
= 75 × 5
= 375 kg m/s
Thus the above answer is correct.
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In order to calculate a planet's orbital period, we must know the Choose one: A. tilt of the planet's axis B. radius of the planet. C. dimensions of its orbit. D. velocity of the planet.
Answers
In order to calculate a planet's orbital period, we must know the dimensions of its orbit. The correct answer is C.
To calculate a planet's orbital period, we need to know the dimensions of its orbit, specifically the semi-major axis. The semi-major axis is the average distance between the planet and its parent star (assuming a circular or nearly circular orbit). The orbital period of a planet is determined by its distance from the star and the mass of the star.
The tilt of the planet's axis (option A) affects the planet's seasons but does not directly impact its orbital period. The radius of the planet (option B) is not directly related to its orbital period either. The velocity of the planet (option D) can vary along its orbit, but it is not sufficient on its own to calculate the orbital period. Hence the correct answer is C.
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People have been using tools to clean their teeth for thousands of years. The ancient Babylonians used chewing sticks and the Romans used toothpicks until the Chinese first invented the toothbrush in the 1600s.
How do all of these forms of dental technology improve people’s lives?
A.
Having clean teeth prevents you from getting diseases such as the flu and cholera.
B.
People with healthy teeth and gums are wealthier than people with cavities.
C.
Healthy teeth and gums are important for our intake of nutrition.
D.
People who have dental disease are not allowed to hold certain jobs.
Answers
Having clean teeth prevents you from getting diseases such as the flu and cholera. Therefore, the correct option is option A.
What is tooth?The study the tooth structure is the focus of the anatomical discipline known as dental anatomy. Dental occlusion, or the contact between teeth, is not included in its field of study, but rather the development, appearance, as well as categorization of teeth are.
Because it deals with naming teeth and their structures, dental anatomy also serves as a taxonomic science. Having clean teeth prevents you from getting diseases such as the flu and cholera.
Therefore, the correct option is option A.
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A physicist observes that a cannonball shot horizontally from a cannon travels 1.000 m before falling to the ground. Which of the following statements correctly explains this observation using Newton's laws?
O Objects tend to remain in the state of motion they are in unless acted upon by an unbalanced force. Friction and gravity acted on the cannonball, slowing it down and slamming it into the ground
O Objects at rest tend to remain in their cument state of motion unless acted upon by an unbalanced force, but objects in motion require a continual application of force to stay in motion
The force on the cannonball produced by the cannon was less than the force of friction on the cannonball, causing the cannonball to slow down and fall to the ground.
O The force on the cannonball produced by the cannon exactly equaled the force of friction on the cannonball, balancing the forces and causing it to fall to the ground.
Answers
The correct statement that explains the observation using Newton's laws is objects at rest tend to remain in their current state of motion unless acted upon by an unbalanced force, but objects in motion require a continual application of force to stay in motion. Here option A is correct.
According to Newton's first law of motion, an object will continue moving at a constant velocity in a straight line unless acted upon by an external force. In this case, when the cannonball is shot horizontally from the cannon, it initially possesses a forward velocity due to the force applied by the cannon. However, once the cannonball is in motion, the only forces acting on it are gravity and friction.
Gravity acts vertically downward, causing the cannonball to accelerate downward. Friction acts horizontally in the opposite direction to the motion of the cannonball. As the cannonball moves forward, friction opposes its motion and gradually slows it down.
Since there is no force continuously propelling the cannonball forward, and the forces of friction and gravity act on it, the cannonball eventually comes to a stop and falls to the ground. Hence option A is correct.
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How is 'one standard kilogram' defined in SI system?
Answers
Explanation:
The standard one kilogram mass is the mass of platinum-iridium cylinder kept at 0 degree Celsius at the International Bureau of Weights and Measures in France. The mass is equal to mass of 1 litre of water at 4 degree Celsius.A guitar string 64 cm long vibrates with a standing wave that has three antinodes. You may want to review. Which harmonic is this?
Answers
This is the third harmonic of the standing wave on the guitar string.
In a standing wave, there are nodes (points where there is no vibration) and antinodes (points of maximum vibration). The number of antinodes in a standing wave on a guitar string is equal to the harmonic number. In this case, the guitar string is 64 cm long and has three antinodes. The distance between each antinode is equal to half a wavelength. Therefore, we can find the wavelength as: wavelength = (64 cm) / (3/2) = 42.67 cm The harmonic number is equal to the number of half-wavelengths that fit on the length of the string, which is given by:
harmonic number = 2 x length / wavelength
Substituting the given values, we get:
harmonic number = 2 x 64 cm / 42.67 cm = 2.99
Rounding to the nearest integer, we get the harmonic number as 3. Therefore, this is the third harmonic of the standing wave on the guitar string.
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a buffer that contains 0.17 m of a base, b and 0.14 m of its conjugate acid bh , has a ph of 9.64. what is the ph after 0.028 mol of naoh are added to 0.86 l of the solution?
Answers
The pH of the buffer after the addition of NaOH is 8.49.
To solve this problem, we need to use the Henderson-Hasselbalch equation:
pH = pKa + log([base]/[acid])
where pKa is the dissociation constant of the weak acid (bh), [base] is the molar concentration of the base (B), and [acid] is the molar concentration of the conjugate acid (BH+).
First, we need to calculate the pKa of the weak acid:
pKa = pH - log([base]/[acid])
pKa = 9.64 - log(0.17/0.14)
pKa = 9.64 - 0.204
pKa = 9.436
Next, we need to calculate the new concentrations of the base and acid after the addition of NaOH. Since NaOH is a strong base, it will react completely with the weak acid (bh) to form its conjugate base (B) and water:
bh + NaOH → B + H2O
The moles of NaOH added is 0.028, and the volume of the buffer is 0.86 L, so the new concentration of B is:
[B] = moles of NaOH added / volume of buffer
[B] = 0.028 mol / 0.86 L
[B] = 0.0326 M
Since the reaction is complete, the concentration of BH+ will decrease by the same amount, so the new concentration of BH+ is:
[BH+] = [BH+]initial - [B]
[BH+] = 0.14 M - 0.0326 M
[BH+] = 0.1074 M
Now we can use the Henderson-Hasselbalch equation again to calculate the new pH:
pH = pKa + log([base]/[acid])
pH = 9.436 + log(0.0326/0.1074)
pH = 9.436 + (-0.946)
pH = 8.49
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A car goes around a curve at a constant speed. what is the direction of the net force on the car?
Answers
Answer:
The direction of the net force is at a tangent to the circle.
How many electrons fill the outer shell of the smallest four elements ( H, He, Li, & Be)?
Answers
Just one electrons fill the outer shell of the smallest four elements( H, He, Li, & Be).
What is an element?A chemical element is a described as chemical substance that cannot be broken down into other substances.
The elements Hydrogen (H), lithium (Li), and sodium (Na), are group 1 elements and are called inert gases or noble gases because of their non-reactivity, hence have just one electron in their outermost shells.
Elements has properties and the properties include, but are not limited to, conductivity, magnetism, melting point, boiling point, color, state of matter, and others.
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A box is being dragged across the floor at a constant speed by a rope puting horizontally on it Friction is not negligible
Draw the vectors starting at the black dot. The location and orientation of the vectors will be graded. The length of the vectors will not be graded.
Answers
The diagram will consist of several vectors starting at the black dot, representing the forces acting on the box being dragged across the floor. The length of the vectors will not be graded.
When a box is being dragged across the floor at a constant speed, several forces are acting on it. The diagram can include the following vectors:
The force of gravity (weight): This vector will point vertically downwards from the black dot, representing the downward force acting on the box due to gravity.
The normal force: This vector will point vertically upwards from the black dot, representing the support force exerted by the floor on the box, perpendicular to the floor's surface.
The tension in the rope: This vector will point horizontally away from the black dot, representing the force exerted by the person pulling the rope.
The frictional force: This vector will point opposite to the direction of motion, parallel to the floor's surface, starting from the black dot. It represents the force of friction that opposes the motion of the box.
These vectors should be appropriately labeled and positioned relative to the black dot to accurately represent the forces acting on the box being dragged across the floor.
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Legged mobile robots are generally less energy efficient than wheeled mobile robots when moving on hard and flat ground because the nature favours legged mobile robots. the former is less stable than the latter. None of the others. the former has generally more degrees of freedom than the latter.
Answers
Legged mobile robots are generally less energy efficient than wheeled mobile robots when moving on hard and flat ground because the nature of the robot, which favours legged mobile robots, is less stable than the latter. The former has generally more degrees of freedom than the latter.
Therefore, the use of legged mobile robots is dependent on their ability to navigate complex terrains. Legged robots are mainly designed for applications in which the environment is either too challenging for wheeled robots to operate in or where the use of wheeled robots is impractical or impossible.
Wheeled robots have excellent stability on hard and flat ground, and they require less energy to move. These features make them an ideal choice for tasks that require high-speed movement or transportation of goods. However, wheeled robots have limited mobility in rough terrain or uneven surfaces, and they can be unstable in such conditions.
Legged robots, on the other hand, have the ability to navigate through rough terrain and uneven surfaces with relative ease. This is because their legs can adapt to the terrain, providing stability and support. Additionally, legged robots have a greater degree of freedom, which makes them more versatile than wheeled robots. However, the use of legged robots requires more energy to operate, making them less energy-efficient than wheeled robots. Therefore, the choice between legged and wheeled robots is dependent on the specific application and the environment in which the robot is to be used.
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Engine of vehicles are manufacturers on the principle of _____
Answers
Explanation:
As the principle, a mixture gas of the fuel and the air is compressed in the cylinder at first and the gas exploded by use of an ignition plug and generate the output power
Explanation:
Engine of vehicles are manufacturers on the principle of internal combustion engine
A sound wave passes from air into water and then into steel. With each change in medium, the velocity of this wave will a(increase,then decrease b(decrease c(increase d( decrease,then increase ?
Answers
Answer:
a
Explanation:
because it can increase anything
When an ambulance drives towards you, the pitch of the siren is higher. After itdrives past, the pitch of the siren is lower.The reason it is lower is that the frequency of the wavelengthA. increasesB. decreasesC. Stays the same
Answers
Doppler's effect:
The Doppler effect states that the frequency of sound increases as it source approaches you and it decreases as the source turns away from you.
When the ambulance drives past you, the pitch of the siren is lower. This is due to the fact that the frequency of the wavelength decreases.
A higher pitch means frequency increases and a lower pitch means frequency decreases.
Therefore, the correct answer is option B. decreases
A delivery company charges 10¢ per cubic inch to deliver a package. If a box is 9 inches long, 7 inches wide, and 4 inches deep, what will it cost to be delivered?
Answers
Answer: \(2520\)¢
Explanation:
Given
Company charges \(10\)¢ per cubic inch
The dimension of the box is \(9\ in.\times 7\ in.\times 4\ in.\)
The volume of the box is
\(V=9\times 7\times 4\\V=252\ in.^3\)
Therefore cost associated with it is
\(\Rightarrow C=10\times 252\\\Rightarrow C=2520\)
Thus, the cost is \(2520\)¢.
Answer:
25.20
Explanation:
Fred takes a personal assessment that tells him that he would be great in the Agriculture, Food, and Natural Resources career cluster. What did Fred most likely mark as interests?
A-the justice system, horticulture, raising animals
B-being outdoors, supporting arguments, fixing broken items
C-being outdoors, horticulture, raising animals
D-fixing broken items, researching topics, leadership skills
Answers
Answer:
yes it is C
Explanation:
Which of the the following models shows the plum-pudding model?
Answers
The third image where the positive and negative charges are embeded into one sphere shows the plum pudding model.
What is the plum pudding model?The plum pudding model is a model of the atom that was first postulated by J.J Thompson. In this model of the atom, the atom was portrayed as a sphere of positive charges in which the negative charges were embeded.
Given this description, we can see that the we ought to look out for the model in which the positive and the negative spheres are all in one pudding as we can see in the images attached to the question.
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Why do conductors transfer heat faster than insulators?
Answers
Answer:
Conduction is usually faster in certain solids and liquids than in gases. Materials that are good conductors of thermal energy are called thermal conductors. Metals are especially good thermal conductors because they have freely moving electrons that can transfer thermal energy quickly and easily.
Heat transfer by convection happens through the air, and there are millions of minuscule air spaces between the fibers. Heat transfer by radiation is also slow since one fiber must radiate its heat to another.
When we give heat then kinetic energy is increase and this heat is transferred from hot metal to cold metal through this free electrons. As in insulator the free electrons are negligible so that the heat is not transferred from hot junction to cold junction due to absence of this free electrons.
Explanation:
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You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood. Which would be the best choice for the typeof mirror? (a) flat (b) concave (c) convex
Answers
You wish to start a fire by reflecting sunlight from a mirror onto some paper under a pile of wood which means the best choice of the type of mirror for this operation is a concave one and is denoted as option B.
What is Concave mirror?This type of mirror usually has a reflective surface that is curved inward and away from the light source. They also reflect light inward to one focal point which is done by reflecting all the rays parallel to its axis and converge them at a single point.
For fire to occur, then we need a large concentration of light rays which will help reflect all the sunlight from a mirror onto some paper under a pile of wood thereby causing the fire.
This is therefore the reason why concave mirror was chosen as the most appropriate choice.
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There is a distance of 2m between the centers of two identical spheres, each with a mass of 25 kg. What is the magnitude and the gravitational force that one sphere exerts on the other?
Answers
Given:
The mass of each sphere is
\(m_1=m_2\text{= 25 }kg\)The distance between the two spheres is r = 2 m
To find the gravitational force that one sphere exerts on the other.
Explanation:
The gravitational force is caculated by the formula
\(F=G\frac{m_1m_2}{r^2}\)Here, the universal gravitational constant is
\(G=\text{ 6.67}\times10^{-11}Nm^2kg^{-2}\)Substituting the values, the gravitational force will be
\(\begin{gathered} F=\frac{6.67\times10^{-11}\times25\times25}{(2)^2} \\ =\text{ 1.04}\times10^{-8}\text{ N} \end{gathered}\)Final Answer: The gravitational force that one sphere exerts on the other is 1.04 x10^-8 N.
What would happen if an Asteroid hit earth?
Answers
Answer:
There would be tremendous earthquakes and tsunamis, followed by massive volcanism around the impact zone. The ozone layer would be destroyed. The oceans would turn acidic. The Sun would be blotted out, probably for decades.
Explanation:
Hope this helps!
Answer: Well it depends on the size. If the asteroid was the size of a basketball, it would most probably turn to dust by the time it reaches the surface. But, if it was the size of Australia, then most probably everyone would die.
Explanation:
Instructions: Answer the following questions in the space provided. Be sure to write your responses in complete sentences.
A father pushes his daughter and son on a sled down a hill.
Part A: Other than the force exerted by the father pushing the sled, identify two additional forces that act on the sled as it travels from the top of the hill to the bottom. (2 pts)
Part B: Explain how each force you identified in Part A will affect the motion of the sled. (2 pts)
Answers
(A) The two additional forces that act on the sled as it travels from the top of the hill to the bottom are friction force and weight of the children.
(B) The force of friction is opposing the motion while the weight of the children is assisting the downward motion.
What are the forces exerted on the sled?
The forces that act on the sled as it travels from the top of the hill to the bottom with either aid the downward motion or oppose the downward motion.
The forces acting on the sled include the following;
the force applied by the fatherthe weight of the children acting normal to the surface of the sledthe force of friction acting upwards to oppose the downward motionThe weight of the children is acting downwards and it will increase the motion downwards since there in the same direction.
The force of friction between the surface of the sled and the hill will oppose the downward motion of the children as the father exerts the downward force.
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write a summary of Albert Einstein accomplishments
Answers
Answer:
He is also known for his discovery of the photoelectric effect, for which he won the Nobel Prize for Physics in 1921. Einstein developed a theory of special and general relativity, which helped to complicate and expand upon theories that had been put forth by Isaac Newton over 200 years prior.
answer :-He is also known for his discovery of the photoelectric effect, for which he won the Nobel Prize for Physics in 1921. Einstein developed a theory of special and general relativity, which helped to complicate and expand upon theories that had been put forth by Isaac Newton over 200 years prior.
Two particles of masses m and 3 m are moving toward each other along the z-axis with the same speed v. They undergo a head-on elastic collision and rebound along the x-axis. Determine the final speed of the heavier object. V'3m = 1 / 3 V v' 3m = v v' 3m = 3v v' 3m = 3 / 2 v v' 3m = infinity v' 3m = 4 v v' 3m = 2v v' 3m = 0 v' 3m = 2 / 3 v v' 3, = 1 / 2 v
Answers
The final speed of the heavier object= -v
In a head-on elastic collision, the conservation of momentum and kinetic energy principles can be applied to determine the final velocities of the objects. Let the final velocity of the mass m be v_m and the final velocity of the mass 3m be v_3m.
The conservation of momentum can be expressed as:
m * v + 3m * (-v) = m * v_m + 3m * v_3m
The conservation of kinetic energy can be expressed as:
0.5 * m * v^2 + 0.5 * 3m * (-v)^2 = 0.5 * m * v_m^2 + 0.5 * 3m * v_3m^2
By solving these equations simultaneously, we can find the final velocity of the heavier object, 3m:
v_3m = -v
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