State whether the following are true or false. 1. Sun dial and sand clock were used in ancient time.
2. Cubit, handspan and foot span are standard units of measurement.
3. Pendulum clock repeats its motion at equal intervals of time.
4. In digital clocks, mechanical vibrations are converted into digital electronic signals.
5. Sundials can also be used on rainy days.

Explanation:

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explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the word that best describes martin luther king jr.'s tone in the video is dignified

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer