A student is at home on a hot summer day when the air conditioning stops working. The student opens the door to the refrigerator and seals off the kitchen from the rest of the house. Which best describes the change in temperature and entropy of the air molecules in the kitchen?

Which statement best describes how private industry decides where to spend the money on research and development

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air