What classical idea about space and time did Einstein reject?

If you lived in a world where people regularly traveled at speeds near the speed of light, why would it be risky to make a dental appointment for $10: 00 \mathrm{AM}$ next Thursday?

A starship passes Earth at $80 \%$ of the speed of light and sends a drone ship forward at half the speed of light relative to itself. Show that the drone travels at $93 \%$ of the speed of light relative to Earth.

How do the measured densities of a body compare at rest and in motion?

Consider a high-speed rocket ship equipped with a flashing light source. If the frequency of flashes seen on an approaching ship is twice what it was when the ship was a fixed distance away, by how much is the period (time interval between flashes) changed? Is this period constant for a constant relative speed? For accelerated motion? Defend your answer.

A person riding on the roof of a freight train fires a gun pointed forward. Relative to the freight car, is the bullet moving faster or slower when the train is moving than when the train is standing still?

Does the equation for time dilation show dilation occurring for all speeds, whether slow or fast? Explain.

Contact Grandma and explain how Einstein's theories of relativity concern the fast and the big-that relativity is not only "out there" but also affects this world. Tell her how these ideas stimulate your quest for more knowledge about the universe. Impress Grandma by properly using the words there, they're, and their in your explanation.

A person riding on the roof of a freight train fires a gun pointed forward. Relative to the ground, is the bullet moving faster or slower when the train is moving than when it is standing still?

Because of time dilation, you observe the hands of your friend's watch to be moving slowly. How does your friend view your watch: as running slowly, running rapidly, or neither?

Two safety pins identical except that one is latched and one is unlatched, are placed in identical acid baths. After the pins are dissolved, what, if anything, is different about the two acid baths?

Due to length contraction, you see people in a spaceship passing by you as being slightly narrower than they normally appear. How do these people view you?

Do the relativity equations for time, length, and momentum hold true for everyday speeds? Explain.

If you were on Earth monitoring a person in a rocket ship traveling away from Earth at a speed close to the speed of light, what changes would you note in his pulse? In his volume? Explain.