A body of mass 25kg, moving at 3 ms per second on a rough horizontal floor brought to rest after sliding through a distance of 2.5m on the floor. calculate the coefficient of sliding friction [g = 10.0 ms per second per second]
To calculate the coefficient of sliding friction, use the equation: frictional force = coefficient of sliding friction × normal force. Substitute the given values to find the coefficient of sliding friction.
Explanation:To calculate the coefficient of sliding friction, we can use the equation:
frictional force = coefficient of sliding friction × normal force
The normal force is equal to the weight of the object, which is given by the equation:
weight = mass × acceleration due to gravity
Substituting the given values, we can calculate the coefficient of sliding friction.
coefficient of sliding friction = frictional force / normal force
normal force = weight of the object = mass × acceleration due to gravity
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Quartz has an index of refraction of 1.46. Diamond has in index of refraction of 2.42. In which material does a light ray entering from air slow down more?
which of the following elements is the most reactive?
Beryllium
Calcium
Magnesium
Barium
Answer;
Barium
Explanation;
Group 2 metals get more reactive as we go down the group. The alkaline earth metals are the elements in Group 2 of the Periodic Table: beryllium, magnesium, calcium, strontium, barium, and radium. alkaline earth metals have low melting points and low densities for metals.
The decrease in reactivity down the group can be explained by the increase in ease at losing two outer electrons as we descend the group. The loss of electrons becomes easier due to the decreasing ionization energy required. Ionization energy decreases due to extra shielding from inner shells and increase in distance from the nucleus.
Answer: The correct answer is Barium.
Explanation: We are given some elements which belong to group 2 of the periodic table. These elements are considered as metals.
Reactivity of metals are defined as the ability of a metal to loose electrons easily.
In a periodic table, as we move down the group, the ability to loose the electrons increases and as a result, the reactivity of elements increases.
From the given elements, the last element which belongs to group 2 is Barium.
Hence, the most reactive element is Barium.
the change in elevation from one contour line to the next is called the
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Which of the following provides evidence that supports the continental drift theory?
Fossils of the same organisms found in different continents
Magnetized rocks that do not match with the poles
Seafloor spreading
Volcanic activity
The answer is A
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Answer:
A
Explanation:
Which tool would you use to measure the amount of rainfall
The distance between two crests of a wave is called
frequency
wavelength
troughs
quantums
Just study this, written down in my notes
Answer: wavelength
Explanation: a transverse wave, the molecules of a body move at right angles to the direction the wave travels, such as the ripples in a string. In a transverse wave, the distance between two crests (high points of a wave) is called the wavelength.
What is the best explanation of the importance of the Second Amendment?
A. People accused of a crime need to be able to speak in their defense.
B. If people cannot talk about policies, they cannot change them.
C. People in the military should have the right to vote in elections.
D. People need to have the ability to protect themselves and their homes.
What happens when sunlight is passed through a prism?
The correct option is C. Visible light separates into different colors.
What is Prism?When light enters a prism, it bends. As a result, the various hues that make up light are divided. This is because every color has a unique wavelength that bends at a particular angle.
The seven primary colors of light are only dispersed through prisms as a conduit. Refraction takes place as light reaches the prism.
The prism's differing velocities cause these deviating colors' diverse wavelengths and frequencies to deviate in different ways at various angles.
Therefore, The correct option is C. Visible light separates into different colors.
To learn more about prism, refer to the link:
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A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Determine the best reason for this occurrence. A) The ping pong ball plastic heats up and expands. B) The number of gas particles inside the ping pong ball increases causing more pressure. C) The gas particles inside speed up due to heat and cause an increase in pressure within the ball. D) Gas particles inside collide with each other less and with the ball more causing the dent to pop out.
) The gas particles inside speed up due to heat and cause an increase in pressure within the ball.
the answer is C the gas particles speed up
When used as a theatrical special effect to simulate fog, carbon dioxide gas tends to stay near the floor of the stage. What might account for this effect?
what is the energy that moves your arms and legs
X-rays are used instead of visible light because X-rays have shorter ______________ than visible light, allowing them to produce images of much greater detail.
i think it might be wavelengths.. but don't quote me on that
During which time period was the acceleration of the car the greatest Question 10 options: 3-5 seconds 5-8 seconds 2-3 seconds 0-2 seconds
Needs more information I think.
Its 2-3 Seconds
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a greyhounds velocity changes from 10 meters per second to 15 meters per second in 0. 5 second. What is the greyhounds average acceleration?
5 m/s^2
10 m/s^2
10 m/s
15 m/s
Why did scientists agree to use one system of measurement
Answer:
Scientists agree to use one system of measurement because by using same measurement system they can easily compare their data and result. By comparing data scientists can find the drawbacks of their research and they can modify their research.
Explanation:
If different countries has different measurement system or different scientist has different measurement system then they cannot compare the results of their experiment with each other. And it will be very difficult for them to share their knowledge.A research is successful when different scientist got same result by applying a particular method. In the absence of one system of measurement a research cannot be verified whether it is successful or not.
scientists agree to use one system of measurement because by using same measurement system they can easily compare their data and result. By comparing data scientists can find the drawbacks of their research and they can modify their research.
Which of the following is created when solids, liquids, or gases mix with one another?
Answer:
D
Explanation:
Pure substance
Why does light refract when it encounters the glass in the lens
the answer is B. because it slows down, which causes it to bend
suppose a treadmill has an average acceleration of 0.05 m/s2. how much does its speed change after 45 seconds?
Examples of tension force