As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?

a. 0.38c b. –0.20c
c. –0.38c d. not given


a

Physics & Space Science

You might also like to view...

Most of the visible light we see coming from the sun originates from the

a. chromosphere. b. photosphere. c. corona. d. sunspots. e. magnetic field.

Physics & Space Science

The central galaxy in a double-lobed radio source is usually

a. an irregular galaxy. b. a spiral galaxy. c. a dwarf elliptical galaxy. d. a giant elliptical galaxy. e. a quasar.

Physics & Space Science

An average lapse rate of 2.7 °F/1000 ft is equivalent to

a. 1.5 °C/m. b. 4.0 °C/1000 ft. c. 5.0 °C/km. d. 6.5 °C/1000 m.

Physics & Space Science

What is the major rock-forming mineral group? Give examples of minerals in this group

What will be an ideal response?

Physics & Space Science