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Svetllana [295]

2 years ago

14

During energy conversions, some energy is always lost as _____. light , heat , electricity or chemical energy?

2 answers:

masya89 [10]2 years ago

3 0

Heat because in a machine heat must come out to follow the law of conservation of energy

Keith_Richards [23]2 years ago

3 0

Answer: It is heat because the two objects are rubbing together

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In one of the original Doppler experiments, a tuba was played at a frequency of 64.0 Hz on a moving flat train car, and a second

wolverine [178]

Answer:

$f_{beat} = 1.64\ Hz$

Explanation:

given,

frequency of tuba.f = 64 Hz

Speed of train approaching, v = 8.50 m/s

beat frequency = ?

using Doppler's effect formula

$f' = f(\dfrac{v}{v-v_s})$

v_s is the velocity of the source

v is the speed of sound, v = 340 m/s

now,

$f' = 64\times (\dfrac{340}{340 - 8.50})$

f' = 65.64 Hz

now, beat frequency is equal to

$f_{beat} = f' - f$

$f_{beat} = 65.64 - 64$

$f_{beat} = 1.64\ Hz$

hence, beat frequency is equal to 1.64 Hz

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Power of an electric motor is 1 h.p. what does it mean ?

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