Which sentence best describes the axis of rotation of Earth?
A. The Axis changes the direction of its tilt over time
B. The axis has a slight tilt
C. The axis tilts so that it is almost horizontal
D. The axis does not have a tilt

Hi i'm new to so i cant offer that many points.
My answer is A. Can someone check?
Many thanks!

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths