A 1 000-Kg Experimental Rocket Sled at Rest on Level

question 66

Multiple Choice

A 1 000-kg experimental rocket sled at rest on level frictionless rails is loaded with 50 kg of propellant.It exhausts the propellant in a 20-s "burn." The rocket moves at 150 m/s after the burn.What average force is experienced by the rocket during the burn?

• A)0.95 x 10⁴ N
• B)0.75 x 10⁴ N
• C)0.60 x 10⁴ N
• D)0.35 x 10⁴ N

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Definitions:

A-not-B Tasks

A cognitive test used to assess the understanding of object permanence in infants, involving hiding an object in one location (A) and then a different location (B) and observing where the infant searches for it.

Goal-driven

Motivated or guided by the desire to achieve specific outcomes or objectives.

Understanding of Minds

The ability to attribute mental states—beliefs, intents, desires, emotions—to oneself and others.

Developmental Stages

Distinct periods in an individual’s life which are characterized by unique physical, cognitive, and emotional developments.