8 Four students P, Q, R and S each attempt to measure the time period (the time for one complete 090ilation) of a pendulum. The arrows in Fig. 21 show the movements of the pendulum that each
student times
P
end
(1)
Ind
(a) State the student who has chosen the correct movement for one period of a pendulum
student​

What is hidden during a lunar eclipse? isn't the moon hidden?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?