Some periodic motions, also known as armonic motions, with which much of us are familiar with are:
- The motion of the swinger when a kid is balancing forward and backward
- The motion of a pendulum
- The motion of the needles of a watch.
- The motion of a satelite around a planet.
- The spinning of the wheel of a stationary bycicle.
- A rocking chair
All the motions in which the object passes once and other times through the same point are periodic motions.
Both scientists and businesses are interested in tracking periodic motions using equations because they appear in many situations in nature and in daily life. The cycles are examples of periodic motion. By tracking this type of motion you can make models that permit you to explain the phenomena and predict cycles. This is predict facts that repeast with a certain period.
Answer:
Dark matter is just matter whose particles do not absorb reflect or emit light and can't be seen directly. We know of its existence because of its effects on objects that we c a n see. It's density formula is 2.241×10⁻²⁷ kg/m³
Step-by-step explanation:
Answer:
Correct option is A
Step-by-step explanation:
Given some statements we have to choose the correct statement.
A. Square BCDF is a rectangle.
As we know, all the properties of rectangle satisfied by square. Therefore, we say that all squares are rectangles. hence, Square BCDF is a rectangle is true statement.
B. Rectangle GJKM is a square.
As explained in above, all the properties of rectangle satisfied by square but its converse is not true i.e all rectangles are not square. Hence, Rectangle GJKM is a square is not always true.
C. Quadrilateral STPR is a trapezoid.
All the properties of trapezoid are not satisfied by all quadrilateral hence, not always true.
D. Parallelogram ABCD is a rhombus
All the properties of rhombus are not satisfied by parallelogram like all sides of rhombus are congruent but parallelogram has only opposite sides congruent. hence, not always true.
Correct option is A.
