Challenger Launch Sequence and Performance

The video covers the launch sequence of the Challenger space shuttle, starting with the countdown initiation controlled by onboard computers. It progresses through the main engine start, solid rocket booster ignition, and liftoff. The video details throttle adjustments during ascent, provides updates on velocity and altitude, and concludes with the solid rocket booster separation and performance confirmation.

What event marks the beginning of the countdown sequence?

• Separation of the solid rocket boosters

• Ignition of the main engines

• Transfer of control to onboard computers

• Transfer of control to ground computers

At what point does the main engine start occur?

• T minus 20 seconds

• T minus 15 seconds

• T minus 5 seconds

• T minus 10 seconds

What happens immediately after the main engine start?

• Liftoff of the Challenger

• Separation of the boosters

• Throttle down of the engines

• Solid rocket booster ignition

During the initial ascent, what is the first major adjustment made to the engines?

• Throttle down by 5%

• Throttle up to 110%

• Throttle up to 100%

• Throttle down by 10%

What is the velocity of the Challenger at one minute and 23 seconds into the flight?

• 2300 feet per second

• 4000 feet per second

• 3400 feet per second

• 1500 feet per second

At what altitude does the Challenger reach 17 nautical miles downrange?

• 15 nautical miles

• 20 nautical miles

• 17 nautical miles

• 11 nautical miles

What event confirms the end of the first stage of the flight?

• Solid rocket booster separation

• Main engine shutdown

• Throttle up to 100%

• Guidance system activation

How is the performance of the first stage described?

• Suboptimal

• Nominal

• Critical

• Delayed