A police car is driving down the street with it's siren on. You are standing still on the sidewalk beside the street. If the fre
1 answer:
Answer:
A) 1568.60 Hz
Explanation:
This change is frequency happens due to doppler effect
The Doppler effect is the change in frequency of a wave in relation to an observer who is moving relative to the wave source
where
C = the propagation speed of waves in the medium;
Vr= is the speed of the receiver relative to the medium,(added to C, if the receiver is moving towards the source, subtracted if the receiver is moving away from the source;
Vs= the speed of the source relative to the medium, added to C, if the source is moving away from the receiver, subtracted if the source is moving towards the receiver.
A) Here the Source is moving towards the receiver(C-Vs)
and the receiver is standing still (Vr=0) therefore the observed frequency should get higher
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Answer:
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Explanation:
The heat needed will be provided by the power dissipated by the resistor. This power gives certain energy per unit time, so we multiply it by time to get the energy provided: .
The equation of heat given mass, specific heat and temperature change is , and the equation of power dissipated by a resistor is
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Putting all together:
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Which means:
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From 23.0°C to 100°C we have a , which we won't need to put in Kelvin in this case since it is a variation, so for our values we have:
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