A blob of material in outer space moves at 3 m/s when it collides and sticks to a half-as-massive blob initially at rest. Compared with the initial kinetic energy of the 3-m/s blob, the kinetic energy of the coupled blobs is

The average speed of a horse that gallops 10 kilometers in 30 minutes is

A) 15 km/h. B) 20 km/h. C) 30 km/h. D) 40 km/h.

________ is the concept that the universe looks the same in all directions

Fill in the blank(s) with correct word

All stars have roughly the same luminosity after the helium flash

Indicate whether the statement is true or false

The ratio of the density of a material to the density of water is

a. the mass density. b. the weight density. c. the specific gravity. d. the buoyant force. e. none of the above.