An old door is very hard to open until oil is sprayed on its hinges. What does the oils do?

A) It increases the force of friction

B) It increases the force of gravity

C) It reduces the force of gravity

D) It reduces the force of friction

What is the frequency of a light wave with a wavelength of 620nm

The trajectory of charged particles in an electric field a. must be along the electric field line always. b. must be tangential to the electric field line. c. is always circular. d. must be perpendicular to the electric field line. e.

A 1.0 kg object moving at 4.5 m/s has a wavelength of: A) 1.5 * 10-34 m B) 2.9 * 10-33 m C) 7.4 * 10-35 m D) 1.4 * 10-34 m E) 2.9 * 10-34 m

The Bohr model was determined ultimately to be flawed. Knowing that "opposites attract (and 'likes' repel)," can you think of any flaws in the Bohr model that disobey these statements?

A batter swings at a baseball. The action force is the bat hitting the ball with a force of 5N. What is the reaction force? the hitter swinging the bat the pitcher throwing the ball the ball going away from the bat the ball hitting the bat

Define valence electrons and identify the number of valence electrons in an element using periodic table.

What is the phenomenon thats occours when two waves (blank) while traveling along the same medium

The acceleration of an object increases by the force applied to it and decreases based on it's mass.

Expresa en terminos de la unidad fundamental

What color does Indigo turn things?