Two identical freight cars roll without friction towards each other on a level track. One car rolls at 2 m/s and the other car rolls at 1 m/s. After the cars collide, they couple and roll together with a speed of

A) 0.5 m/s.
B) 0.33 m/s.
C) 0.67 m/s.
D) 1.0 m/s.
E) none of the above


Answer: A

Physics & Space Science

You might also like to view...

What is dispersion?

a. The reflection of colors off the surface of a bright-colored translucent object, like a jewel. b. The refraction of light as it passes from air into water. c. The separation of colors of light because their waves superpose. d. The separation of light into different colors because of how different colors of light refract differently. e. The combination of a spectrum of colored lights into white light.

Physics & Space Science

Comets are composed of ______________

a. dust and ice b. rock c. helium d. lead e. iron

Physics & Space Science

A 5.0-nC point charge is embedded at the center of a nonconducting sphere (radius = 2.0 cm) which has a charge of -8.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point that is 1.0 cm from the center of the sphere?

a. 1.8 × 10^5 N/C b. 9.0 × 10^4 N/C c. 3.6 × 10^5 N/C d. 2.7 × 10^5 N/C e. 7.2 × 10^5 N/C

Physics & Space Science

A series of ocean waves are moving past a surfer at a frequency of 40 waves per hour. Approximately how many waves would the surfer expect during 48 minutes?

a. 1920 waves b. 32 waves c. 40 waves d. 50 waves

Physics & Space Science