Answer:
1751399.8902 J
Explanation:
m = Mass of water = 74.6 kg
= Latent heat of fusion =
= 19.2°C
= 0°C
We have the equation for cold body
We have the equation
Energy rejected to the room is 26667799.8902 J
Energy supplied to the device is given by
The energy supplied to the device is 1751399.8902 J
Answer:
velocity of this in the direction of the Earth is 6.4 × m/s
Explanation:
given data
wavelength = 121.6 nm
wavelength = 124.2 nm
solution
we get here first change in wavelength that is
= 124.2 nm - 121.6 nm ...............1
= 2.6 nm
we get here velocity of direction of the Earth that is express as
............2
put here value we get v
v =
v = 6.4 × m/s
Answer: 394 Hz
Explanation: this is a question under Doppler effect.
The mathematical equation that defines a Doppler effect is given below as
fo = {c+ vo/ c - vs} × f
Where fo = frequency observed =?
c = speed of sound = 345 m/s
vo = velocity of observer relative to source = 9.5m/s
vs = velocity of source relative to observer = - 9.5 m/s ( the negative sign is as a result of the fact that the observer and the source are moving in opposite direction to each other)
f = frequency of sound by source = 394 Hz.
By substituting the parameters, we have that
fo = {345 + 9.5/ 345 - (-9.5)} × 394
fo = (345 +9.5/ 345 + 9.5) × 394
fo = (354.5/354.5) × 394
fo = 1 × 394 = 394 Hz
They are not good conductors of heat such as potassium