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Advocard [28]
3 years ago
15

Explain how a helicopter lifts itself up, from a Newton's 3rd Law perspective,

Physics
1 answer:
Lerok [7]3 years ago
7 0
When a helicopter engine spins the main rotor, it generates torque (see How a Helicopter Works), an equal and opposite reaction. Torque makes it so that the engine itself wants to spin.
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Identify two types of simple machines in this compund machine.
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Answer:

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3 0
3 years ago
A 1451 kg car is traveling at 48.0 km/h. How much kinetic energy does it possess? K.E. =
jarptica [38.1K]

           Kinetic energy  =  (1/2) (mass) (speed)²

BUT . . . in order to use this equation just the way it's written,
the speed has to be in meters per second.  So we'll have to
make that conversion.

        KE  =  (1/2) · (1,451 kg) · (48 km/hr)² · (1000 m/km)² · (1 hr/3,600 sec)²

               =  (725.5) · (48 · 1000 · 1 / 3,600)²  (kg) · (km·m·hr / hr·km·sec)²

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               =    128,978  joules  (rounded)
8 0
3 years ago
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