A0.25-kg ball attached to a string is rotating in a horizontal circle of radius 0.5 m. if the ball revolves twice every second, what is the tension in the string?

19.74 N

Explanation:

mass of ball (m) = 0.25 kg

radius (r) = 0.5 m

time (t) = 2 revolutions per seconds = 1/2 = 0.5 second per revolution

find the tension in the string

tension (T) =

tension now becomes (T) =

tension (T) =

tension (T) =

tension (T) =   =   = 19.74 N

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.