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In 1-dimentional motion, if we know the acceleration
of an object, then its velocity can be expressed as:
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6. Easter It’s Easter in the UK and the shops are full of Easter eggs, hot-cross buns and Easter bunnies. Easter is a holiday celebrated in early spring. The date of the festival is not fixed. It is celebrated on the first Sunday of a full moon day after March 21. It usually falls between March 21 and April 25. It started as a Christian holiday, created by the early Christians to celebrate the rebirth of Jesus from the dead. It is a religious holiday celebrated by Christians, but non-religious people often mark the day, too. Over time it became a holiday meant to celebrate spring and the rebirth of the earth after a long, cold winter. Symbols of Easter are eggs, rabbits, lambs, flowers, especially tulips and the religious symbols of the cross, and the virgin Mary. Children around the world have fun on Easter by painting eggs, hunting for chocolate eggs, making rabbit and flower crafts and enjoying a delicious lamb dinner. Although Easter is widely seen as a Christian festival which celebrates the resurrection of Jesus, its origins pre-date Christianity and many of its symbols come from the earliest civilizations. Our modern festival’s roots lie in ancient seasonal rituals which marked the transition from the "death" of winter to the new life and rebirth of spring. These days we give chocolate eggs as gifts at Easter but eggs have been symbols of fertility for thousands of years. The ancient Persians gave each other painted eggs for the festival of Nowrooz, a celebration held at the spring equinox which marked the start of Persian New Year. The tradition continues to this day. Centuries ago, the early Saxon people marked buns with a cross to honour their goddess Eostre, whose name some people believe to be the origin of the word Easter. It is believed that early Christians incorporated such pagan festivals into their religion. Some experts say the Easter bunny was originally a hare as this animal represented fertility and growth in pagan mythology due to its capacity for reproduction. Moreover, in some ancient cultures the hare was also a symbol of the moon, which is significant as the date of Easter changes each year depending on the lunar cycle. The Easter bunny has become an important symbol of Easter all over the world. But nowadays not everybody treats such symbols with respect. Pranksters in the Austrian town of Villach have stolen a giant Easter Bunny from the town square. Local police say it should not be too difficult to spot as it is two meters tall and weighs 60kg. 11. Why is the bunny regarded as an important symbol of Easter according to the passage?
A、It is notable for its capacity of abundant production.
B、Because it is born only in spring.
C、Because it is the symbol of love.
D、It is notable for their cleverness and loveliness.
An object moving in r =100m circle satisfies:
, how much is the magnitude of acceleration when t=1s?
A、
B、
C、
D、
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