Basilisk lizards can run across the top of a water surface.With each step, a lizard first slaps its foot againstthe water and then pushes it down into the water rapidly enough toform an air cavity around the top of the foot. To avoid having topull the foot back up against water drag in order to complete thestep, the lizard withdraws the foot before water can flow into theair cavity. If the lizard is not to sink, the average upward impulseon the lizard during this full action of slap, downward push, andwithdrawal must match the downward impulse due to the gravitationalforce. Suppose the mass of a basilisk lizard is 90.0 g, the massof each foot is 3.00 g, the speed of a foot as it slaps the water is1.50 m/s, and the time for a single step is 0.600 s. (a) What is themagnitude of the impulse on the lizard during the slap? (Assumethis impulse is directly upward.) (b) During the 0.600 s duration ofa step, what is the downward impulse on the lizard due to the gravitationalforce? (c) Which action, the slap or the push, provides theprimary support for the lizard, or are they approximately equal intheir support?
Basilisk lizards can run across the top of a water surface
.With each step, a lizard first slaps its foot against
the water and then pushes it down into the water rapidly enough to
form an air cavity around the top of the foot. To avoid having to
pull the foot back up against water drag in order to complete the
step, the lizard withdraws the foot before water can flow into the
air cavity. If the lizard is not to sink, the average upward impulse
on the lizard during this full action of slap, downward push, and
withdrawal must match the downward impulse due to the gravitational
force. Suppose the mass of a basilisk lizard is 90.0 g, the mass
of each foot is 3.00 g, the speed of a foot as it slaps the water is
1.50 m/s, and the time for a single step is 0.600 s. (a) What is the
magnitude of the impulse on the lizard during the slap? (Assume
this impulse is directly upward.) (b) During the 0.600 s duration of
a step, what is the downward impulse on the lizard due to the gravitational
force? (c) Which action, the slap or the push, provides the
primary support for the lizard, or are they approximately equal in
their support?
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