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blondinia [14]
3 years ago
15

A car company is doing crash tests and has installed forcesensors in the chairs and seatbelts to measure the forces thatare exer

ted on crash test dummies during a crash. In oneparticular test the sensors measure a horizontal net force onthe dummy of 39,400 N when the car comes to a complete stopfrom an initial speed of 35 m/s in 1.4 m. Treating the dummyas a point particle and assuming it comes to rest in the samedistance, what is the mass of the test dummy used during thistest
Physics
1 answer:
natulia [17]3 years ago
3 0

Answer:

m=90.1kg

Explanation:

From the question we are told that

Force F=39400

Initial speed V_1=35m/s

Distanced=1.4m

Generally the equation for acceleration is mathematically given by

a=\frac{V^2-U^2}{2d}

a=\frac{0^2-35^2}{21.4}

a=\frac{0^2-35^2}{21.4}

a=-437.5m/sec^2

Generally the equation for mass is mathematically given by

F=ma\\m=F/a

m=\frac{-39400}{-437.5}

m=90.1kg

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Answer:

v=2.02\frac{m}{s}

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Answer:

1)        3.92 J

2) 1596.08 J

3)         16.3 s ??

Explanation:

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Question 3 is not clear

to the point 80 cm above the ground the flight time is only 0.01 s

The time when the mass strikes ground again will be twice the time gravity takes to reduce the initial velocity to zero

t = 2(80.0 / 9.8) = 16.3 s

would not 80 m above the ground be a much more interesting point to consider?

PE = 0.5(9.8)(80) = 392 J

KE = 1600 - 392 = 1208 J

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Answer:

0.765m

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From the formula

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h = 30/4(9.8)

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h = 0.765m\

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