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Physics, 21.06.2019 14:20
Physics make-up packetname_cle14. an observer hears a sound with a frequency of 400 hz. if the speed of sound is 340 m/s,what is the wavelength of the sound? a. 0.85 mb. 1.2 mc. 2.75 m13.6 m15. as sound travels from steel into air, its speed decreases. if the frequency of the wavedoesn't change, what happens to its wavelength? a. it increases(b) it decreasesc. it remains the samed. there is not enough information given
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Physics, 23.06.2019 06:30
Pl i beg u so much now propane burns in oxygen to produce carbon dioxide and steam. the unbalanced equation for this reaction is: c3h8 + o2 β co2 + h2o use coefficients to balance this equation. a) c3h8 + 3 o2 β 3 co2 + 4 h2o b) c3h8 + o2 β 3 co2 + 4 h2o c) c3h8 + 5 o2 β 3 co2 + 4 h2o d) 2 c3h8 + 5 o2 β 3 co2 + 4 h2o
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Physics, 23.06.2019 16:30
No matter what energy transformation we discuss, we know that no energy transfer is 100% efficient. you are about to enter a bicycle rave. you have trained extensively and eaten well to maximize your energy input throughout the bicycle race. you know that some of your kinetic energy will become wasted energy in the form of heat. what is the source of the heat energy and how can you minimize it to maximize the efficiency of your performance in the race? a) you are the source of the heat energy. you can minimize the heat energy but selecting the appropriate clothes to wear. b) air resistance is the source of he heat energy. you can minimize the air resistance by your position while riding the bicycle. c) friction is the source of the heat energy. you can minimize the friction by lubricating all appropriate parts and keeping the tires well inflated. d) kinetic energy is the source of the heat energy. you can reduce the production of heat energy but minimizing the energy you expend to race on the bicycle.
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Physics, 23.06.2019 23:00
Aspaceship is designed to support animal life for a multiyear voyage to the outer planets of the solar system. plants will be grown to provide oxygen and to recycle carbon dioxide. since the spaceship will be too far from the sun for photosynthesis, an artificial light source will be needed. 13) what wavelengths of light should be used to maximize plant growth with a minimum of energy expenditure? a) full-spectrum white light b) green light c) a mixture of blue and red light d) uv light
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Chemistry, 20.07.2019 08:00
Biology, 20.07.2019 08:00
Computers and Technology, 20.07.2019 08:00
English, 20.07.2019 08:00
Biology, 20.07.2019 08:00
History, 20.07.2019 08:00