A 40-gallon gas water heater can recover in about an hour. But a Recovery for a 40-gallon electric water heater takes about two hours.But I'm not so sure about a water tank
Answer:
Democritus
Explanation:
Democritus came up with the idea of indivisible atoms. The earliest known proponent of anything resembling modern atomic theory was the ancient Greek thinker Democritus. He proposed the existence of indivisible atoms as a response to the arguments of Parmenides and the paradoxes of Zeno.
Answer:
The statements A and D are true
The statements B and C are false
Explanation:
The force between charges can be explained by the Coulomb's Law.
According to Coulomb:
1 - Like charges always repel each other
2- Unlike or opposite charges always attrack each other
3- Force between 2 charges is given by:

where F is the force between 2 charges and r is the distance between 2 charges.
We can see that Force F is inversely proportional to the distance r
Which means that when F increase, r decreases and when F decreases, r increases
Answer:
10800 kg m/s
Explanation:
Since the dumpster was initially at rest, its momentum before collision equal to zero. So that the total momentum of the car and dumpster before collision is 10800 kg m/s.
The principle of conservation of linear momentum states that: in a system of colliding bodies, total momentum is conserved. Therefore, the total momentum of the car and dumpster after collision is 10800 kg m/s.
Answer:
527 ° C
Explanation:
For black body radiation, the power emitted per unit area is directly proportional to the absolute temperature raised to the fourth power:
j = k T⁴
First, convert 127° C to Kelvins:
127° C + 273.15 = 400.15 K
Now find the constant of variation:
2×10⁵ = k (400.15)⁴
k = 7.80×10⁻⁶
Finally, solve for the temperature at the new rate of radiation:
32×10⁵ = (7.80×10⁻⁶) T⁴
T = 800.3
The temperature is 800 K, or about 527 ° C.