If the temperature is 68°F and the air contains 1% water vapor, what is the relative humidity?

Suppose the temperature is 15°C and the relative humidity is 50%. What is the absolute humidity?

Suppose the temperature is 80° F with 1 % absolute humidity . A cold front moves in, causing the temperature to drop. Precipitation will begin to fall when the temperature drops below what level?

The average power available from sunlight on Earth (day and night) is 300 Watts per m²
Earth's surface area = 5.1 x 108 km² (square kilometers)

Suppose solar energy is used on this planet. Assume the facts listed above.



Today, the best photovoltaic solar panels are able to convert 20% of the available energy to electricity. If a glowglobe uses as much electricity as a 25 Watt light bulb, how large an area of solar panels would be needed to light one glowglobe for each of the 1000 persons living in the sietch?

Solar power available on Earth: (0.3 kilowatts per square meter) = 300 Joules/second m²

Suppose a "plantoid" alien being requires the same amont of energy per day as a human but uses photosynthesis (with 20% solar efficiency) instead of eating food. Assume a human being eats food containing 2000 food Calories per day (1 food Calorie = 4.18 kilo-Joules). What surface area (in square meters, m²) would the plantoid need to sustain itself?

A "cameloid" alien can lose 30% of its weight in water after 17 days in the desert without drinking; then, when it finds water, it can drink enough in ten minutes to replace it all. Suppose after 17 days in the desert a fully dehydrated cameloid weighing 500 kg finds water; how much would it have to drink?

Today in the United States, the per capita power consumption is 10,500 Watts. In Bangladesh, it is 265 Watts. For the Bangladeshi per capita power to grow exponentially to reach that of the United states by 2100 (assuming that of the U.S. remains constant) what doubling time would be needed?

In the year 1960, the CO2 level in Earth's atmosphere was 317 parts per million (ppm). In 2000, the CO2 level was 370 ppm. If CO2 increases exponentially, what is the doubling time?

If the earth has 3.57x10^8 square meters of ocean, which is 70% of the earth's surface, what is the earth's surface area?

If the human body uses 0.5 liters of water per day for bile production, how long would it take for the body to release 3.5 liters of water through bile?