Explanation: A horizontal plane is a plane which is perpendicular to the plumb line and also tangential to a level surface at a particular point.
Which line is perpendicular to the plumb line?
Explanation: Level Line: Any line laying on the level surface is called as the level line. Obviously, the level line is perpendicular to the plumb line.
What is the term that is normal to plumb line at all points?
The line normal to the plumb line is known as level line.
Does a plumb line always point to the center of the earth?
Static Effects: The Plumb Line
Due to the rotation of the earth, local vertical doesn’t point back directly to the center of the earth. It will at the equator and the poles, but at other locations, it points slightly away from the center.
What is the direction of the plumb line?
direction of the Plumb-line, or true vertical, is always perpendicular to this surface. the figure of the earth, and the departure of the geoid from this spheroid can be calculated by the deviation of the Plumb-line, or vertical. This is obtained from astronomical observations combined with triangulation data.
Which lines are perpendicular lines?
Perpendicular lines are lines that intersect at a 90-degree angle.
Which of the following is an example of perpendicular lines?
Lines that intersect each other forming a right angle are called perpendicular lines. Example: the steps of a straight ladder; the opposite sides of a rectangle.
Which line is vertical to the level line at a point?
Obviously, the level line is perpendicular to the plumb line. Vertical line: It is a line from any point on the earth’s surface to the center of the earth. e.g. plumb line.
Which line is the tangent to the level line at a point Mcq?
Clarification: Horizontal plane through a point is a plane tangential to the level surface at that point. It is, therefore, perpendicular to the plumb line through the point.
What do you mean by line of collimation?
Line of collimation: It is an imaginary line passing through the intersection of the crosshairs at the diaphragm and the optical center of the object-glass and its continuation.
What is the relation between the plumb line and the earth axis?
A plumb line always points towards the local gravitational center of the Earth.
Are plumb lines parallel?
“Plumb” is what you call a perfectly vertical line. Vertical means up and down. Something that is “plumb” runs perpendicular to the horizon—meaning that when it intersects the horizon, it makes a right (90 degree) angle.
Where does a plumb bob point?
To use the tool, the string is fixed at the point to be plumbed. The weight, or bob, is then allowed to swing freely; when it stops, the point of the bob is precisely below the point at which the string is fixed above. (Note that the line must be hanging free to get an accurate reading.)
Which of the following can be determined using a plumb line?
A plumb bob and line alone can determine only a vertical reference.
Where do you hang the plumb line when determining the Centre of gravity?
Hang the plumb line on the pin. Pierce the pin anywhere along the edge of the shape, so that your shape is free to swing/rotate. Hold the pin and wait until the shape and the plumb line have settled.
What is a plumb line geography?
1 : a line (as of cord) that has at one end a weight (such as a plumb bob) and is used especially to determine verticality. 2 : a line directed to the center of gravity of the earth : a vertical line.
What is mean by perpendicular line?
Perpendicular lines are the lines that intersect each other at right angles (90 degrees). The symbol used to represent a parallel line is “||”. The symbol used to represent perpendicular lines is “⊥”.
What is it called when two perpendicular lines intersect?
All definitions can be read as a conditional statement. They can be read forward (conditional) and backward (its converse). ex) perpendicular lines conditional If two lines are perpendicular, then they intersect to form right angles. converse If two lines intersect to form right angles, then they are perpendicular.
Which one of the following statements is true perpendicular lines?
The TRUE statement: “The lines intersect and are perpendicular.” This is true because the slopes of the two lines are opposite-reciprocals of each other.
Which is true about perpendicular lines?
The two main properties of perpendicular lines are given below. These lines always intersect at right angles. If two lines are perpendicular to the same line, they are parallel to each other and will never intersect.
How do you know if two lines are perpendicular?
If two non-vertical lines in the same plane intersect at a right angle then they are said to be perpendicular. Horizontal and vertical lines are perpendicular to each other i.e. the axes of the coordinate plane. The slopes of two perpendicular lines are negative reciprocals.