Which of the following kinds of molecules is thought to have been absent from the primitive reducing atmosphere? a. water vapor (h2o)b. carbon dioxide (co2)c. hydrogen (h2)d. oxygen (o2)e. nitrogen (n2)

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

As the distance from a magnet increases, what happens to the magnet force?