A skateboarder is practicing on the \"Thalf-pipe shown in the figure below, usin

Question

A skateboarder is practicing on the "Thalf-pipe shown in the figure below, using a special frictionless skateboard. (Yows can also ignore the kinetic eneray of the skateboard's wheels.) If she starts from rest at the top of the half pipe, what is her speed at the bottom (b) If the skateboarder has mass m-40 kg. what is her apparent weight at the bottom of the half pipe What s does she then have when she reaches the top edge on the other side of the half pipe? Now suppose she has speed of 12 m/s at the bottom of the half-pipe. what is the highest Pe t she eatiesch,mm This pem b. above the adesastalten Enter the mano math ano att slap 54 AM 02 TOSHIBA 6 7 8

Explanation / Answer

a) m g h = 1/2 m v2

v = sqrt (2 g h ) = sqrt (2 * 9.8 * 4 )

speed at bottom = 8.85 m/s

b) centripetal acceleration ac = v2 / r = 8.852 / 4 = 19.6 m/s2

apparent weight = m (ac + g)

= 40 * (19.6 + 9.8)

apparent weight = 1176 N

c) speed = 0 m/s

4) m g h = 1/2 m v2

h = v2 / 2 g = 122 / (2 * 9.8)

highest point = 7.346 m

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