The length of an arc, of radius L (which is the length of the pendulum) and angle Φ is LΦ cm.
So L*0.9 = 18 ie L = 20 cm
if by arc you mean the "Period" of the pendulum then yes, it does: with each revolution the period of the pendulum (the time taken to swing back and forth once) does decrease.
There was on in the clock on a friend's mantelpiece.
The energy or information in a wave travels a great distance. This energy is carried by the wave itself as it propagates through a medium or space.
because the light travels through the water which splits the light and can only be seen from a certain distance away
"Light year" is a distance. Specifically, it's the distance that light travels through vacuum in one year. The distance is approximately 5,878,291,000,000 miles.
No, frequency is not directly proportional to distance. The frequency of a wave is determined by its source and is not directly related to the distance it travels. However, factors such as the medium through which the wave travels can affect its frequency.
A light year is a measure of distance. It is the distance light travels through the vacuum of space in one year's time; about 5.86 trillion miles.
Because distance/time = the speed at which something travels.
A light year is a measure of distance. It is the distance light travels through the vacuum of space in one year's time. This is about 5.86 trillion miles.
The distance in which a wave travels is known as wavelength. It is the distance between two consecutive points in a wave that are in phase.
The long hand makes one complete revolution around the clock in one hour. It travels 360 degrees in rotation, or 2 pi radians. The tip of the long hand travels 2 pi inches per inch of length of the hand. The center of the long hand ( pivot point) does not move at all, but travels 2 pi radians in rotation.
If this is a homework assignment, please consider trying to answer it yourself first, otherwise the value of the reinforcement of the lesson offered by the assignment will be lost on you.The period of a pendulum increases as it length increases because the verticle distance the bob travels is less, and thus there is less potential energy available to accelerate the bob in its arc. Also, recall that in vector mechanics the horizontal force vector due to gravity is a function of the direction the object is constrained to follow, and if the pendulum is longer, that direction is more horizontal, giving the horizontal force vector less of an effect.