Are we the same age as the universe because matter cannot be created nor destroyed

Which type of microscope would allow the viewer to see ribosomes inside a cell?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg. how much energy e must be supplied to the device? express your answer in joules.