(5) Galileo Galilie has found out the laws of the simple pendulum.
1s
(6) The time taken by the simple pendulum to complete 20 oscillations
is called its time period.
7) The simple pendulum of the given length takes always the same
time to complete one oscillation.
(8) A speedometer records the speed of the vehicle directly in km/h.
19) Every object moves with a constant speed.
(10) The distance between two cities is measured in kilometres.
(11) The time period of a given pendulum is not constant.
true or false on science
chapter 13 motion and time
Answers
Answer:
Sean Carroll relates the story of Galileo's discovery of the fact that for small amplitudes, the period and frequency are unaffected by the amplitude. "In 1581, a young Galileo Galilei reportedly made a breakthrough discovery while he sat bored during a church service in Pisa. The chandelier overhead would swing gently back and forth, but it seemed to move more quickly when it was swinging widely (after a gust of wind, for example) and more slowly when it wasn't moving as far. Intrigued, Galileo decided to measure how much time it took for each swing, using the only approximately periodic event to which he had ready access: the beating of his own pulse. He found something interesting: The number of heartbeats between swings of the chandelier was roughly the same, regardless of whether the swings were wide or narrow. The size of the oscillations - how far the pendulum swung back and forth - didn't affect the frequency of those oscillations."
Answer:
At the age of seventeen, Galileo know that he had discovered an important law-a law of a pendulum. He see that if he could check the time of a swing of the pendulum by means of his pulse beats, he can just as well check his pulse by means of a pendulum.
Explanation: