the atmospheric temperature decreases when snow starts melting because the snow releases thermal energy from the atmosphere to m
2 answers:
Answer:
FALSE
Explanation:
When snow melt in the form of liquid then in this type of phase transformation we can say that energy is required to convert it from solid to liquid
The heat energy required to convert it into liquid is given by
here we know
m = mass of snow
L = latent heat of fusion
So when snow is melt into liquid then in that case the thermal energy from the surrounding is absorbed to convert it into the form of liquid.
You might be interested in
Answer: The frequency heard will be f = 275.675Hz
Explanation: When an object emitting sound is moving, it occurs a phenomenon called Doppler shift or Doppler effect. What happens is that the sound gets higher when the moving object comes closer the observer and becomes lower after it passes, This change is due to the quantity of waves that passes through an area in an unit of time.
The formula to calculate the Doppler effect is as follows
f = () · f₀
f is the observed frequency;
c is the speed of sound;
Vs is velocity of the source;
f₀ is the emitted frequency of source;
Substituting and calculating,
f = · 300
f = 275.675 Hz
Thus, the frequency heard by the police officer is 275.675Hz.
Answer:
Explanation:
To calculate the force we need to use this equation
where L is the total length of the wire
So in this case the small element of current is
Because x is the direction of the current flow.
As is said in the problem B is such that
so to use the equation above we first calculate the following cross product:
so the force:
So here we use the fact that B=0 in any point of the x axis that is not , that means that we only need to do the integration between a very short distant behind the point
and a very short distant after that point, meaning:
so is the same as evaluating at
that is:
