<span>A
sound wave is a pressure wave that results from the vibration of the particles
o the medium from the source. The motion of the particles in the medium is
parallel to the direction of the energy transport. The type of wave formed by a
sound wave is the longitudinal wave. </span>A longitudinal wave is
characterized by rarefactions. A longitudinal wave is a wave motion wherein the
particles in the wave medium are displaced parallel to transport. When motion
is detected from the source, the particle next to it vibrates from its rest
position and a progressive change in phase vibration is observed at each
particle within that wave. The result is that the energy is transported from
one region to the other. These combined motions result in the movement of
alternating regions of rarefaction in the direction of propagation.
<span>Ohm's law deals with the relation between
voltage and current in an ideal conductor. It states that: Potential difference
across a conductor is proportional to the current that pass through it. It is
expressed as V=IR. The correct answer from the choices listed above is option A. The resistance has increased. </span>
Answer:
1)Eat healthy food
2)Exercise daily
3)Drink plenty of water
4)Get plenty of sleep
5)Do not take stress
6)Be hygienic
Explanation:
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Answer:
<em>8hours 45minutes</em>
Explanation:
Amount of heat energy used up by the electric substance = heat gained by the water.
Amount of heat energy used up by the electric substance = Power * Time
heat gained by the water. = mcΔt
m is the mass of the water in kg
c is the specific heat capacity
Δt is the change in temperature
Given parameters
Power = 5kW = 5000W
mass of water m = 500kg
c = 4200J/kgC
Δt = 100°C - 25°C = 75°C
Required
Time taken
Substituting the given parameters into the formula
Pt = mcΔt
5000t = 500*4200*75
5000t = 157,500,000
Divide both sides by 5000
t = 157,500,000/5000
t = 31,500 secs
t = (31,500/3600)hrs
t = 8.75hours
t = 8hours 45minutes
<em>Hence it takes 8hours 45minutes to heat 500 kg of water in the tank from 25c to 100c</em>
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