The arrangement of atoms at the peak of the activation energy barrier is known as the
a. activation rate
c. transition state
d. both b and c

Will you chech and finish these for me, because i am stumped with them.

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

Why do astronauts in the space shuttle weigh less?