posted 10 months ago

Is that true?

Which floor ages fastest?

Please explain your reasoning.

posted 10 months ago

Does the radius of the "star" increases or decreases? By how much?

Does the (average) temperature of the "star" increases or decreases? By how much?

posted 10 months ago

posted 10 months ago

What is the ratio of their temperatures?

What is the ratio of their (apparent) brightness if the more luminous one is 100 times more distant than the other.

posted 10 months ago

Show that the order of events is preserved by all observers travelling at less than the speed of light.

Now events P and Q are space-like. P is still at the origin, but Q is simultaneous with P but one meter to the right 0=(1.0)

.Show that the order of events is not preserved by observers travelling at less than the speed of light.

posted 10 months ago

posted 10 months ago

posted 10 months ago

Explain why this is impossible.

Now, there are only two pieces; one flies east the other west. One piece weighs three times as much as the other. What is the ratio of the kinetic energies of the two pieces?

posted 10 months ago

posted 10 months ago