A classroom that has a 200-square meter floor area and a 3.5 meter-high ceiling. a) What is the volume of the room (in m^3). b) Assuming a room temperature of 20 deg C, what is the density of the air in the room? c) How many kilograms of air occupy the room? d) What is the weight of the air in Newtons (N)? e) What is the weight of the air in Pounds (lbs.)?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion

The sound level near a noisy air conditioner is 70 db. if two such units operate side by side, the sound level near the, would bea. 70dbb. 73 dbc. 105 dbd 140 db

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light