A weightlifter lifts a 100-kg weight 1.5 meters off the floor at a constant velocity. Which statement about this situation is true? The mechanical energy of the system increased because of friction.

The mechanical energy of the system decreased because of friction.

The kinetic energy of the weight decreased as it was lifted up.

The potential energy of the weight decreased as it was lifted up.

1) c. The energy on the macroscopic scale decreased, and the energy on the molecular scale increased.

2) d.  Friction converts some energy on the macroscopic scale to energy on the molecular scale.

3) d. The mechanical energy of the system decreased because of friction.

4) d. The mechanical energy of the system at the beginning of the experiment is equal to the mechanical energy of the system at the end of the experiment.

5) d. The mechanical energy of the system decreased due to the transfer of energy on a macroscopic scale to energy on a molecular scale.

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Explanation:

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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.