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In a car collision, the bag expands suddenly and cushions
the impact of the passenger. Assume the impact velocity is
105 km/h. For a 70-kg person with a 30-cm allowed
stopping distance, (a) calculate the stopping force per cm(square)
applied to the person, if the average applied force is
uniformly distributed over a 1000-cm(square) area of the
passenger's body. (b) calculate the duration of the collision
between the passenger and the inflated bag of the collision
protection device. (c) If the rupture strength for body tissue
is about 5 X 1000000 dyn/cm(sqare), will the impact force lead to
serious injury for the passenger?
Whiplash usually occurs in [Best answer]
motor vehicle collision.
A.
Head-on
B. Rear-end
C. Roll-over
D. Rotational
A vehicle travelling along a street skidded on an icy patch and hit a roadside barrier the time interval of the impact was 0.955 seconds during which the barrier exerted a force of 505 and what is the magnitude of the change in momentum from the vehicle
A car traveles at a constant speed of 37km/hr round of curve of radius 300m find how long it will take to turn through 180 degree of Arc.
A 400kg mass on a 30 degree inclined plane is acted upon by a force equal to 4800N at an angle 30 degree with the incline as shown in the figure below.
The purpose of banking a curved road is [Best answer]
(A) to provide a force supporting the weight of
the car.
(B) to provide the centrifugal force.
(C) to provide the centripetal force.
(D) to provide the frictional force.
A metallic sphere of 10g is attached to a rubber cord of initial length 100cm and rotated in a horizontal plane uniformly in a rate of 10rev/sec. Find the length of the cord at the speed and the tension along it given that a force of 0.5N stretches the rubber cord by 1cm. Take G=9.81m/s2
A girl is standing at the edge of a cliff 100. m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward
with a speed 8.00 m/s.
a) How long does it take the rock to hit the ground?
b) What is the speed of the rock the instant before it hits the ground?
I think the answers are:
a) 6.4s
b) 45.0m
Explain why the skater spins faster when she
closes her arms but she opens her arms to
stop spinning in figure skating.
In a large hollow cylinder, roller-coaster rider
can drive the car along the wall of the cylinder.
What minimum speed must be the car
without sliding downward?
