An unfueled 1 000-kg experimental rocket sled on level frictionless rails is loaded with 50 kg of propellant.It exhausts the propellant in a 20-s "burn." If the rocket,initially at rest,moves at 160 m/s after the burn,what impulse is experienced by the rocket sled? A)1.1 × 10⁵ kg·m/s B)1.6 × 10⁵ kg·m/s C)1.5 × 10⁵ kg·m/s D)1.9 × 10⁵ kg·m/s

Question

Quizplus · Accepted Answer

The impulse experienced by the rocket sled can be calculated using the formula for impulse, which is the change in momentum ($ \Delta p = m \Delta v $). Since the sled and propellant together have a mass of $1050 \, \text{kg}$ and the sled moves at $160 \, \text{m/s}$ after the burn, the change in momentum is $1050 \, \text{kg} \times 160 \, \text{m/s} = 1.68 \times 10^5 \, \text{kg} \cdot \text{m/s}$, which is closest to $1.6 \times 10^5 \, \text{kg} \cdot \text{m/s}$, making option B correct.

An Unfueled 1 000-Kg Experimental Rocket Sled on Level Frictionless