At the instant a race began, a 61-kg sprinter exerted a force of 730n on the starting block at a 22° angle with respect to the ground. what was the horizontal acceleration of the sprinter? if the force was exerted for 0.33s, with what speed did the sprinter leave the starting block?

Answer

given,

mass of the sprinter = 61 kg

angle of the block = 22°

Force = 730 N

time = 0.33 s

Horizontal force = F cos θ

                           = 740 cos 22°

                           = 686.17 N

horizontal acceleration =

                                      =

                                      =11.25 m/s²

Impulse = F Δt

             = 686.17 x 0.33

            = 226.44 Kgm/s

velocity=

            =

            =3.71 m/s

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000