Model the fuel burning as a steady ejection of small pellets, each with the small mass δm. suppose it takes a short time δt to accelerate a pellet (at constant acceleration) to the exhaust speed vex. further, suppose the rocket is clamped down so that it can't recoil. find an expression for the magnitude of the force that one pellet exerts on the rocket during the short time while the pellet is being expelled.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.