Suppose rocket traveler Amelia has a clock made on Earth. Every year on her birthday she sends a light signal to brother Casper on Earth. (Assume Amelia is traveling at a speed of 0.8c from Earth to a planet 8 light years away from Earth and back again.)
(a) At what rate does Casper receive the signals during Amelia's outward journey?
(b) At what rate does he receive the signals during her return journey?

We all use gps today, even if we don't drive yet. i bet you have been in the car with a parent and they have asked you to get out your phone to find a specific location. in your car, on the phone, you are using a very sophisticated technology. gps satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. gps receivers take this information and use trilateration to calculate the user's exact location. essentially, the gps receiver compares the time a signal was transmitted by a satellite with the time it was received. the time difference tells the gps receiver how far away the satellite is. now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map. what type of signal is utilized by the gps satellite?

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Akg a of 55 m at an of 11 ? . if is at 98 km/h,be ?