Escape Speed: a Satellite Is in Circular Orbit at an Altitude

question 21

Multiple Choice

Escape speed: A satellite is in circular orbit at an altitude of 1500 km above the surface of a nonrotating planet with an orbital speed of 9.2 km/s. The minimum speed needed to escape from the surface of the planet is 14.9 km/s, and G = 6.67 × 10^-11 N ∙ m²/kg². The orbital period of the satellite is closest to

• A) 72 min.
• B) 65 min.
• C) 58 min.
• D) 51 min.
• E) 44 min.

Understand the basic documentation techniques for motor control circuits.

Describe the concept of mechanical overload and its effects on motors.

Identify the principles of overcurrent protection in motor circuits.

Distinguish between ladder and wiring diagrams.

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