Okay guys i need serious here !

are lithium, sodium, potassium, rubidium, cesium, and francium shiny or dull? answer the question for each metal individually!

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?