Two particles of equal masses are revolving circular path of radius r1 and r2 respectively with the same period.

The ratio of their centripetal force is: ... ?

Which of the following best explains energy transformation in hydrogen fuel cells? Methane reacts with oxygen to produce carbon and hydrogen atoms, which releases energy. Hydrogen reacts with oxygen to produce water, which releases energy.

Some animals communicate by emitting low frequency sound waves. When the animal emits a low frequency sound wave what is the resulting pitch?

The meteorological reports that today will reach a high of 45 F. Your friend from Sweden asks what the temperature will be in degrees Celsius. What value would you report to your friend

True or False. Radio waves have longer wavelengths than X-rays.

Redox reactions: Redox reactions: rarely involve enzymes. do not occur under physiological conditions. are characterized by one substance gaining an electron while another substance loses an electron.

Hich of the following needs is an addition to Maslow's original hierarchy and only appears in the eight-stage revised model

Which of the following types of boundaries is most likely to result in a subduction zone? a. divergent b. convergent c. transform d. all of the above

in 1 second, 2.68x10^16 Na ions arrived at the negative electrode and 3.92x10^16 Cl - ions arrive at the positive electrode what is the current passing through the electrodes?

All of the following involve waves of electromagnetic energy except A. watching videos on a computer screen B. radios receiving signals through air C. the rumble of thunder during a storm D. sunlight shining on a plant leaf

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L