What is the primary role of the respiratory system in living organisms?

A. to make carbon dioxide

B. to obtain oxygen

C. to use up nitrogen

D. to find hydrogen

Which quantity best captures the concept of resistance? A. the ratio of voltage to current B. the product of power and voltage C. the ratio of power to current D. the ratio of voltage to power E. the product of voltage and current

A 42 Watt light bulb is connected to a 12 volt source of potential

If a wave has a wavelength of 4m and a frequency of 2.5hz what is the velocity of the wave

A taxi starts from Monument Circle and travels 5 kilometers to the east for 5 minutes. Then it travels 10 kilometers to the south for 10 minutes.

Flying against the wind, an airplane travels 2670 km in 3 hours. Flying with the wind, the same plane travels 11,070 km in 9 hours. What is the rate of the plane in still air and what is the rate of the wind?

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?

Suppose that Paul D. Trigger fires a bullet from a gun. Will the speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun? Explain.