If 56.5kJ are needed to raise the temp by 90°C and if the heater is 60% efficient that means that:
60% X y = 56.5kJ
where y is the electrical energy in kJ that the heater will use.
y = 94.2kJ
Answer:
Disagree
Explanation:
We cannot see infared lights.
<span>PE = m * g * h
PE = 60 * 9.8 * 4
PE = 2352 J
Power = E/t
Power = PE/t
Power = 2352/4.2
Power = 560 Watt</span>
Explanation:
- effect of density in speed of sound.
- effect of direction of wind in speed of sound.
because there is no medium to travel sound in vacuum.
hope it helps.
Answer:
1 km
Explanation:
Bob travels at one km/h and it takes him one hour to get there.
