Which force acts on a body if it is fully or partially immersed in a
liquid?
Answers
Answer:
Buoyant Force
Explanation:
That's literally the definition of the buoyant force
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A car takes 1 hour to travel 80 miles and 5 hours to travel 400miles how far can it travel in 3 hours
Answers
Answers
Answer:
Explanation:
Let the area of one circular side be given by the formula :
However, the wire is a solid cylinder, then it means that the total area is 2 × =
However, there is the surface area to consider. This is the curved area of the wire. This is given as:
The length is x.
The breadth is calculated as follows - the length of the circle =
Then the area = lb
=
Therefore, the total area is given as
=
b) visible light, infrared, X rays, ultraviolet, gamma rays, radio
c) radio, infrared, visible light, ultraviolet, X rays, gamma rays
d) gamma rays, X rays, visible light, ultraviolet, infrared, radio
e) radio, X rays, visible light, ultraviolet, infrared, gamma rays
Answers
Answer: The answer is "C"
Explanation:
The electromagnetic waves are arranged in the increasing wavelength and energy by the following order;
Radio waves has the lowest energy and wavelength but of the highest frequency.
The Infra-red rays follows the visible light follows, the ultraviolet ray follows, the X-ray follows and then the Gamma-ray has the highest energy and wavelength but the lowest frequency.
Therefore the answer is C, radio, infra, visible, ultraviolet, x-ray, gamma.
Answer:
C
Explanation:
Electromagnetic waves are categorized in terms of their wavelengths and frequency. This categorization is known as the Electromagnetic Spectrum.
When they are arranged in terms of increasing frequency, their wavelengths are decreasing. This is because wavelength and frequency are inversely proportional.
Since energy and frequency are directly proportional, increasing frequency would mean increasing energy.
In terms of increasing energy, the correct order is:
Radio waves
Infrared
Visible light
Ultraviolet
X rays
Gamma rays
B. an echo.
C. diffraction.
D. refraction.
Answers
Diffraction by description is occurrence where the sound wave is interrupted or interacts with certain obstructions or barriers. According to Huygens-Fresnel principle, it is where the waves are interfered by said circumstances during its travel in the confined specific space. Furthermore, the amount of size the wavelength is directly proportional to its interacted slit or barrier thus, these behaviors and amount are positively correlated. Moreover, it occurs in a variety of waves –may it be sound waves, water waves or electromagnetic waves.
B) 20 N/m
C) 12 N/m
D) 25 N/m
E) 390 N/m
Answers
Answer: The spring constant is K=392.4N/m
Explanation:
According to hook's law the applied force F will be directly proportional to the extension e produced provided the spring is not distorted
The force F=ke
Where k=spring constant
e= Extention produced
h=2m
Given that
e=20cm to meter 20/100= 0.2m
m=100g to kg m=100/1000= 0.1kg
But F=mg
Ignoring air resistance
assuming g=9.81m/s²
Since the compression causes the plastic ball to poses potential energy hence energy stored in the spring
E=1/2ke²=mgh
Substituting our values to find k
First we make k subject of formula
k=2mgh/e²
k=2*0.1*9.81*2/0.1²
K=3.921/0.01
K=392.4N/m
(1) Kinetic energy decreases and total mechanical energy increases.
(2) Kinetic energy decreases and total mechanical energy remains the same.
(3) Kinetic energy remains the same and total mechanical energy increases.
(4) Kinetic energy remains the same and total mechanical energy remains the same.
Answers
Taking into account the definition of kinetic, potencial and mechanical energy, kinetic energy decreases and total mechanical energy remains the same.
Kinetic energy
Kinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Potential energy
On the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Mechanical energy
Finally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:
Potential energy + kinetic energy = total mechanical energy
Principle of conservation of mechanical energy
The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)
Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.
This case
The principle of conservation of mechanical energy can be applied in this case. When a block is pulled at constant speed up an incline, the potential energy increases because it increases the height.
Then, if by the principle mentioned above, the total mechanical energy remains the same, the kinetic energy decreases.
In summary, the correct answer is option (2)Kinetic energy decreases and total mechanical energy remains the same.
Learn more about mechanical energy:
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brainly.com/question/12784057?referrer=searchResults
Answer:
(2) Kinetic energy remains the same and total mechanical energy increases.
Explanation:
A body has kinetic energy due to its speed. A body has potential energy due its position or configuration. The sum of kinetic energy and potential energy is known as mechanical energy.
As the block is pulled up at constant speed, the kinetic energy remains the same. With increase in the height, the potential energy of the body increases. Thus, due to increase in potential energy, there is increase in the total mechanical energy.