Two ships pass at ever higher relative speed. What happens to gamma?

• It stays exactly 1
• It shrinks toward zero
• It grows without bound

Frame S prime drifts past frame S at speed v along x. Which pair converts an event between them?

• x alone, since time runs the same
• x prime and t prime through gamma, v, and c
• v alone, since positions match

Two bulbs at the ends of a 26 m car flash together for a trackside watcher while the car passes at half light speed. What does the seated passenger see?

• The flashes at different times
• The flashes together, like the watcher
• No flashes at all

A ship racing Earthward at half light speed shines a laser ahead. At what speed does the light approach Earth?

• 1.5 c
• 0.5 c
• Still c

A ship at 0.5 c fires a canister forward at 0.75 c. Type the speed Earth sees, in units of c.

Answer: ______________

Two cars approach at motorway speeds. Why does the relativistic rule agree with ordinary addition?

• Gamma is infinite at low speeds
• The fraction bottom is nearly 1 at low speeds
• Light speed is zero for slow objects

Two ticks happen at the same spot aboard a passing ship. How do you get the dilated time on your clock?

• Just add the ship speed to the tick count
• Transform the pair with the Lorentz time line and read off the stretched gap
• Measure the ship length instead

Adding 0.5 c and 0.75 c in the same direction can reach 1.25 c.

Circle one:   True   False