How much physical activity should an adult have each week? A. 60 minutes per day, 7 days a week
B 30 minutes per day, 7 days a week
С. 60 minutes per day, 5 days a week
D 30 minutes per day, 5 days a week
Please select the best answer from the choices provided.
A
B

C

prndulum needs thread, weight clock to time swings

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.

the moving of the box is a result of centripetal force. think of that  as a car or a truck in this case creates a turn, the force of friction performing upon the turned wheels of the car runs centripetal force obligatory for circular motion for the things inside it.