An athlete whose mass is 90.0 kg is performing weight-lifting exercises. Starting from therest position, he lifts, with constant acceleration, a barbell thatweighs 490 N. He lifts the barbell a distance of 0.60 m in a time of 1.6 s.
a) Draw a clearly labeled free-body force diagram for thebarbell and for the athlete.
b) Use Newton's laws to find the total force that his feetexert on the ground as he lifts the barbell. ( Please show all work).

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

70 give a real life example showing how sensory neurons work with the motor neurons

Newton's law of cooling states that the rate of change in the temperature t(t) of a body is proportional to the difference between the temperature of the medium m(t) and the temperature of the body. that is, startfraction dt over dt endfraction equals upper k left bracket upper m left parenthesis t right parenthesis minus upper t left parenthesis t right parenthesis right bracket , where k is a constant. let kequals0.04 left parenthesis min right parenthesis superscript negative 1 and the temperature of the medium be constant, m(t) font size decreased by 3 equivalent font size decreased by 3 294 kelvins. if the body is initially at 369 kelvins, use euler's method with hequals0.1 min to approximate the temperature of the body after (a) 30 minutes and (b) 60 minutes.