In 1980, over San Francisco Bay, a large yo-yo was released from a crane. Suppose the yo-yo was 160 kg, and it consisted of two uniform disks of radius 34.7 cm connected by an axle of radius 3.47 cm. What was the magnitude of the acceleration of the yo-yo during (a) its fall and (b) its rise? (c) What was the tension in the cord on which it rolled?

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

he made 11 calls in one day

answer: 31, 5556. 952 seconds