An astronaut wishes to visit the Andromeda galaxy, making a one-way trip that will take 31.7 years in the space-ship's frame of reference. Assume the galaxy is 2.00 million light years away and his speed is constant. Required:
a. How fast must he travel relative to Earth?
b. What will be the kinetic energy of his spacecraft, which has a mass of 1.00 x 10^6 kg?
c. What is teh cost of this energy if it is purchased at a typical consumer price for electric energy, 13.0 cents per kWh?

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects