An amusement park designer wants his swing to have a centripetal acceleration of 21 m/s2. If the velocity of the swing is 13 m/s, how long
should the chain on the swing be?
A. 8.5 m
B. 9.5 m
C. 9.0 m
D. 8.0 m

12000j is work done

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

conservation of mass

mass before something happens = mass afterwards