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stepladder [879]
4 years ago
8

1. Define the following in the case of a concave mirror.

Physics
1 answer:
insens350 [35]4 years ago
5 0

Answer:

Principal focus of a concave mirror. The principal focus of a concave mirror is a point on its principal axis to which all the light rays are parallel and close to the axis converge after reflection from the concave mirror.

Focal length of a concave mirror. The focal length of a concave mirror is the distance between its pole and the principal focus

The reflecting surface of a spherical mirror forms a part of a sphere. The centre of this sphere. This point is called the centre of curvature of the spherical mirror. Center of curvature can also be defined as the point in the centre of the sphere from which the mirror was sliced. It is represented by the letter C. Please note that the centre of curvature lies outside the mirror's reflecting surface. The centre of curvature of a concave mirror lies in front of it. However, it lies behind the mirror in case of a convex mirror.

If a concave mirror were thought of as being a slice of a sphere, then there would be a line passing through the center of the sphere and attaching to the mirror in the exact center of the mirror. This line is known as the principal axis.

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What is the mass of an object with a velocity of 24.1 m/s and a momentum of 28.3 kg m/s?​
ahrayia [7]

Answer:

1.17427...kg

Explanation:

Assumptions: no friction, no air resistance, no internal resistance, and it is 1 dimensional travel for velocity.

p=mv, where p is momentum, m is mass, and v is velocity

28.3=24.1(m)

divide both sides by 24.1

you get 1.174273859

6 0
3 years ago
Read 2 more answers
Jake calculates that the frequency of a wave is 230 hertz, and its wave is moving at 460 m/s. What is the wavelength of the wave
Nesterboy [21]

Wavelength = (speed) / (frequency) = (460 m/s) / (230/sec) = <em>2 meters</em>


3 0
3 years ago
Which part of the manufacturing process involves heating and rolling blocks of steel into flat sheets and bars?
faltersainse [42]

A. Forming

Explanation:

Metal forming is a metallurgical process which involves heating and rolling blocks of steel into flat sheets and bars.

Metal forming is the process of working metals and utilizing its properties to form different shapes.

  • Metal forming is made possible by metallic bonds in metals.
  • The bulk of the physical properties of metals can be attributed to these bond types.
  • In metal forming, metals are shaped into different substances.
  • Metal forming preserves the mass of the metallic body and the shapes modified by force.

Learn more:

Metals brainly.com/question/9053565

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8 0
4 years ago
The three forces shown act on a particle. what is the direction of the resultant of these three forces?
melisa1 [442]
Missing figure: http://d2vlcm61l7u1fs.cloudfront.net/media/f5d/f5d9d0bc-e05f-4cd8-9277-da7cdda3aebf/phpJK1JgJ.png

Solution:
We need to find the magnitude of the resultant on both x- and y-axis.

x-axis) The resultant on the x-axis is
F_x = 65 N\cdot cos 30^{\circ} - 30 N - 20 N\cdot sin 20^{\circ} = 19.45 N
in the positive direction.

y-axis) The resultant on the y-axis is
F_y = 65 N \cdot sin 30^{\circ} - 20 N \cdot cos 20^{\circ} = 13.70 N
in the positive direction.

Both Fx and Fy are positive, so the resultant is in the first quadrant. We can find the angle and so the direction using
\tan \alpha =  \frac{F_y}{F_x} = \frac{13.70 N}{19.45 N}=0.7
from which we find 
\alpha=35^{\circ}
7 0
4 years ago
Using the interactive map, available at ejatlas.org, identify two separate environmental justice issues ongoing anywhere in the
NeTakaya

Answer:

Explanation:

1) The specific issue is the emission of the CO2 gases into the atmosphere and conflicts over coal extraction as leaving the oil in the soil.

2)Land acquisition conflicts and the Agro fuels industries and biomass energy plants are causing more environmental problems.

EJOCT project is meant for considering the causes of climate debt and ecological debt and designed many projects under the clean development mechanism allowing rich countries to offset their emissions by reducing emissions.

Large parts of the global justice movement united around a push for the concept of climate debt in copenhagen climate summit.In the people's summit in Bolivia in 2010, climate debt was considered as the over consumption of the Earth's atmosphere and climate system to absorb green house gases by the developed countries. The map shows the spatial mal distribution of climate change sources and its impacts.

Yes the methods the Summits are taking are correct and can reduce the emission of CO2 gases. The methods they were implementing are supportable to the environment.If the people follow those methods the climate debt can be minimised.I have taken this topic as the emission of CO2 gases is the main problem all the world.Due to this the melting of Ice and Global warming are occuring.This was the main problem to solve all over the world as the no. of Industries and vehicles and population is increasing.These movements are an appropriate way to change and improve the environment in which people have to live.

8 0
3 years ago
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