BIO The Fall of T. rex Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted a normal force of approximately 260,000 N on its torso as it landed. Assuming the torso has a mass of 3800 kg, (a) find the magnitude of the torso's upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7 g .) (b) Assuming the torso of a T . rex is in free fall for a distance of 1.46 m as it falls to the ground, how much time is required for the torso to come to rest once it contacts the ground?
BIO The Fall of T. rex Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted a normal force of approximately 260,000 N on its torso as it landed. Assuming the torso has a mass of 3800 kg, (a) find the magnitude of the torso's upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7 g .) (b) Assuming the torso of a T . rex is in free fall for a distance of 1.46 m as it falls to the ground, how much time is required for the torso to come to rest once it contacts the ground?
BIO The Fall of T. rex Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted a normal force of approximately 260,000 N on its torso as it landed. Assuming the torso has a mass of 3800 kg, (a) find the magnitude of the torso's upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7g.) (b) Assuming the torso of a T. rex is in free fall for a distance of 1.46 m as it falls to the ground, how much time is required for the torso to come to rest once it contacts the ground?
A shopper in a supermarket pushes a loaded cart with a horizontal force of 11 N. The cart has a mass of 25 kg.
(a) How far will it move in 4.0 s, starting from rest? (Ignore friction.) m(b) How far will it move in 4.0 s if the shopper places his 30 N child in the cart before he begins to push it? m
As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the
downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 45.0 kg. If this fish is moving upward at 3.00 m/s as its
head first breaks the surface and has an upward speed of 5.40 m/s after two-thirds of its length has left the surface, assume constant acceleration and
determine the following.
(a) the salmon's acceleration
m/s² upward
(b) the magnitude of the force F during this interval
10 of 31
Listen
Study the scenario.
A car is moving along a frictionless surface with a speed of 2
m/s to the left. You and your friend each come over and push
the car at the same time. You exert a force of 6 N to the left,
while your friend exerts a force of 6 N to the right.
According to Newton's first law, how will this action affect the
car's motion?
The car will speed up because your force is in the
same direction of the car's motion, making it speed
up.
The car will stop immediately because two balanced
forces will cause an object to stop moving.
The car will continue moving to the left but at a
slower speed because your friend's force is going to
make the car slow down.
The car will continue to move 2 m/s to the left
because there are balanced forces acting on it.
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