Mini-Quiz: Effect of Sun on Escape Velocity from Earth

1. Why must the rocket engines be shut off for our calculations?

   To prevent overheating when achieving escape velocitySorry, not correct. Try another button. The equation is for freely moving objectsCorrect. You understand the material. To save fuel in case the rocket starts fallingGood try, but not right. Select another answer.

2. Why is the effect of the Sun measured on the far side of Earth?

   That is where the Sun's gravitation is pulling against the rocket motionThat is Correct. You know about escape velocities! Rocket blast-offs are always at nightOops! Wrong answer. Re-read the question and try again. There is no rotation of the Earth in that areaSorry, not correct. Try another button.

3. What would happen if the rocket did not attain the combined escape velocity?

   It really wouldn't matter, since the rocket was moving upwardOops! Wrong answer. Re-read the question and try again. The rocket would have to reduce its massGood try, but not right. Select another answer. It might escape Earth but then fall into the SunCorrect. You understand the material.

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