A block of mass 0.5kg on a horizontal surface is attached to a horizontal spring of negligible mass and spring constant 50N/m. The other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. When the spring is unstretched, the block is located at x = 0m. The block is then pulled to x = 0.5m and released from rest so that the block-spring system oscillates between x = -0.5m and x = 0.5m, as shown in the figure. Which of the following claims is correct about the block’s period of oscillation? 1- The period would increase if the block were released from rest at x=0.8m.
2- The period would increase if the block had a mass of 1.2kg
3- The period would increase if the spring had a spring constant of 75 N/m
4- The period would increase if the block-spring system was oriented vertically so that the block-spring system oscillates between y = -0.5m and y = 0.5m , the mass of the block is 0.5kg, and the spring constant is 50 N/m.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

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.

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

technology is the application of the knowledge gained by science.