Which of these surfaces would have the least amount of friction? grass
sand paper
concrete
satin cloth

Why does the input force have to be greater than the force needed to lift the bale?

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point