7,000 litres of water is pumped out of a tank in 42 minutes. How many litres could be pumped out in one hour at the same rate? (a) 1,000 litres (b) 1,670 litres (c) 10,000 litres (d) 12,000 litres (e) 60,000 litres

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.