CP Ch06.7 Escape Speed

How does the concept of escape speed challenge the saying 'What goes up must come down'?

• It proves that objects can escape Earth's gravitational pull and not come back down

• It proves that objects can only go up and never come back down

• It proves that objects always come back down regardless of their initial speed

• It proves that objects can escape Earth's atmosphere and float in space forever

What will a cannonball fired vertically at escape speed do?

• Continue rising indefinitely

• Rise to a maximum height, reverse direction, and fall back to Earth

• Explode in mid-air

• Disappear into space

What is the critical speed called that allows a projectile to outrun gravity and escape Earth?

• Terminal speed

• Landing speed

• Escape speed

• Launch speed

What will happen if anything is projected away from Earth at 11.2 km/s?

• It will return to Earth

• It will orbit around Earth

• It will escape Earth's gravitational pull

• It will slow down and stop in space

What does escape speed allow a projectile to do in relation to Earth's gravitation?

• Escape Earth itself

• Stay in Earth's orbit

• Travel to other planets

• Land safely on Earth

What is the escape speed from the surface of Earth?

• 8.2 kilometers per second

• 11.2 kilometers per second

• 14.2 kilometers per second

• 17.2 kilometers per second

What happens to a projectile launched at a speed greater than escape speed?

• It will return to Earth eventually.

• It will orbit Earth indefinitely.

• It will leave Earth and never return.

• It will slow down and fall back to Earth.