Days after use for a party, a partially inflated helium balloon no longer floats like it once did due to helium particles leaking out of the seal. Observe the
helium atoms within the balloon in the diagram below.
Key:
Helium
particle
Direction and speed of particle
(longer arrow represents more speed)
As an experiment, a student holds the partially deflated balloon over a heating
pad to heat it up. The student notices the balloon begins to expand and when
they let go of the balloon it even floats again for a few moments before sinking
back down.
r

221,500 is the answer

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )