Which best describes friction?

A force of 200 N is applied at piston A, which has a surface area of 4 cm 2. The pressure is transferred through oil to piston B which applies a force of 3000 N. Calculate the surface area of piston B.

Which of the following statements about electromagnetic radiation are TRUE? a. Wavelength and frequency are inversely proportional. b. Frequencies are given in units of seconds. c. All electromagnetic waves travel through space at the same speed. d.

How many hydrogen atoms are present in one molecule of an ammonium acetate NH4C2H3O2?

The rock cycle indicates that each type of rock: a.) can provide materials to make other rocks b.) can form other rocks c.) can be changed by natural processes d.) all of the above

A slab of concrete with an unknown mass slides down an inclined plane that has an angle of 0.56 rad to the horizontal. Assuming that the coefficient of kinetic friction is 0.39, What is the acceleration of the slab down the slope in m/s2

Which is the correctly balanced equation for the reaction of rust, Fe2O3, and hydrochloric acid, HCl? Fe2O3 + HCl → FeCl3 + H2O Fe2O3 + 3 HCl → 2 FeCl3 + H2O Fe2O3 + 6 HCl → 2 FeCl3 + 3 H2O Fe2O3 + 3 HCl → 2 FeCl3 + 3 H2O

How many DNA strands could you fit into a milimeter

A screwdriver with a 1-cm shaft and a 4-cm handle is used to tighten a screw. calculate the ideal mechanical advantage.

Plants make food through photosynthesis, a chemical reaction. What are the starting substances of the reaction?

How long will it take to travel 200,000 m traveling 100 m/s?