[Caroline]

مرحبااا
هذأأ ححل سؤال 77 For a planet and a moon with identical
densities, the Roche limit is 2.446
times the radius of the planet. Earth’s
Roche limit is 18,470 km.

وهذا حل سؤال 78
The force exerted by the ground on the
tire accelerates the car. This force is
produced by the engine. It creates the
force by rotating the axle. The torque is
equal to the force on the edge of the
tire multiplied by the radius of the tire.
Gears in the transmission may cause
the force to change, but they do not
change the torque. Therefore, the
amount of torque created by the
engine is delivered to the wheels.

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